LIMIT VALUE TEST KIT Liquid special indicator in dropper bottle for the monitoring of softened water, set for the limit values of 0.5 and 0.25 °dH (8,9 and 4,47 ppm).  Description Complete with measuring tube and stopper  Analyses: approx. 250 Measuring time: approx. ½ minute

Duroval TI Test Kit 0-30 °dH from Heyl – Industrial Water Hardness Analysis Titration test kit for determining total water hardness The Duroval TI Test Kit 0-30 °dH is an analysis set for precise determination of total water hardness in water samples via complexometric titration. The TI test kit provides fast and reliable results in the range of 0 to 30 °dH. In approximately 2 minutes, users receive meaningful measurements with an accuracy of 0.5 °dH. Contents of the test kit: Measuring tube Indicator Calibrated dosing pipette 0–30 °dH 30 ml titration solution Reliable Total Hardness Determination via Complexometric Titration The Duroval TI Test Kit 0–30 °dH is a professional analysis set from Heyl for precise determination of total water hardness in industrial and commercial applications. The proven complexometric titration method ensures accurate analysis of raw, process, and operational water across a wide measurement range. The test kit delivers fast and reproducible results. Within approximately 2 minutes, users obtain meaningful measurements with an accuracy of 0.5 °dH, making it ideal for routine checks and commissioning. Advantages of the Duroval TI Test Kit for Industrial Applications The Duroval TI Test Kit stands out due to its simple handling and high measurement reliability. The calibrated dosing pipette ensures precise addition of the titration solution, while the clear color change of the indicator enables accurate evaluation. The compact set is especially suitable for mobile measurements, service tasks, and regular checks in industrial water treatment. It provides a precise manual alternative to automated measurement systems and supports efficient quality and process monitoring. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Refill Pack Reagents for Testoval Iron 0–1 mg/L (II + III) – Original from Heyl Colorimetric reagents for determining dissolved iron in the low concentration range for approx. 100 analyses With the refill pack reagents for Testoval Iron 0–1 mg/L (|| + |||) for the concentration range of 0–1 mg/L Fe, you can replenish your existing Testoval Iron analysis kit with a complete set of chemical reagents for determining iron in water. Original Heyl reagents for precise iron determination in the low measurement range The measurement range covers 0–1 mg/L Fe. Individual values of 0.05 mg/L, 0.1 mg/L, 0.25 mg/L, 0.5 mg/L, 0.75 mg/L, and 1.0 mg/L can be safely read using optical color comparison. As an original Heyl product, the reagents are precisely matched to the Testoval Iron test kit, ensuring consistently reliable results. Advantages of the Original Heyl Refill Reagents for Testoval Iron The refill pack allows for approximately 100 analyses, with a measurement time of about 7 minutes per sample. This makes the set an economical and efficient solution for regular iron analyses in drinking, process, and industrial water. By diluting the water sample at a 1:10 ratio with distilled water, the measurement range can be flexibly extended up to 10 times the iron concentration. Using original Heyl reagents ensures consistently high measurement quality, maximum compatibility, and reliable water analysis. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Refill pack: 1 set of TESTOVAL pH-Chlor DPD reagents for rapid manual analysis of the pH value in the range pH 6.8 - 8 and the chlorine content in the concentration range 0 - 1 mg/l (free and total chlorine) in swimming pool water. The pH values pH 6.8, pH 7.4 and pH 8 and the values for the chlorine content 0.1 mg/l, 0.5 mg/l and 1 mg/l can be read by optical colour comparison. The scope of delivery includes only the reagents for simple concentration determination. 1 set of reagents Number of analyses: approx. 70 Measuring time: approx. 3 minutes Also available in the shop: Complete colorimetric test kit pH-Chlor DPD: Order no. 410601 Replacement colour comparison device pH-Chlor DPD: Order no. 410603

Testoval Chlor DPD Reagents Refill Pack – Measure Chlorine Levels Reliably Refill your Testoval Chlor test set for consistent results The Testoval Chlor DPD Reagents Refill Pack is designed for DPD chlorine tests in the concentration range of 0.1–1 mg/l for free and total chlorine. Individual values of 0.1 mg/l, 0.2 mg/l, 0.3 mg/l, 0.5 mg/l, 0.75 mg/l, and 1 mg/l can be read using an optical color comparison. With this refill pack, you can continue to perform accurate chlorine determinations. Fast color changes simplify water analysis. Refill Reagents for Precise DPD Chlorine Analysis in the Low Range The Testoval Chlor DPD Reagents Refill Pack from Heyl is intended for refilling the Testoval Chlor test sets and ensures reliable determination of free and total chlorine in the 0.1–1.0 mg/l range. Using optical color comparison, individual values of 0.1 mg/l, 0.2 mg/l, 0.3 mg/l, 0.5 mg/l, 0.75 mg/l, and 1.0 mg/l can be read accurately. This makes the refill pack ideal for routine water monitoring checks. Advantages of the Testoval Chlor DPD Refill Pack for Water Analysis The refill pack allows existing test sets to be used economically and sustainably. The reagents produce fast and clear color changes, simplifying evaluation and reducing measurement errors. The DPD method is a proven procedure for chlorine determination and is suitable for various applications, such as drinking water monitoring, swimming pools, or technical installations. The refill pack ensures consistent measurement quality and reliable chlorine analysis in daily use. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Testoval Phosphate Reagents Refill Pack – Accurate Phosphate Measurement Testoval for continuous, precise phosphate analyses – the original from Heyl Testoval Phosphate Reagents Refill Pack for quick and manual analysis of phosphate content in water. Individual values of 0.25 mg/L, 0.5 mg/L, 1 mg/L, 2.5 mg/L, 5 mg/L, and 10 mg/L can be read using optical color comparison. The refill pack provides reproducible results within minutes. By diluting the water sample at a 1:10 ratio with distilled water, the measurement range can be extended up to ten times. Refill reagents for reliable and reproducible phosphate analyses The Testoval Phosphate Reagents Refill Pack is designed to supplement an existing Testoval Phosphate analysis kit and allows for quick and manual determination of phosphate content in water. The refill pack is ideal for routine monitoring in water analysis. Advantages of the Testoval Phosphate Reagents Refill Pack for water analysis The refill reagents provide reproducible results within minutes and allow for simple evaluation without additional measurement equipment. This supports efficient and reliable phosphate analysis in drinking, process, and industrial water. By diluting the water sample at a 1:10 ratio with distilled water, the measurement range can be flexibly extended up to ten times the phosphate concentration. The refill pack therefore offers high operational reliability and an economical solution for regular phosphate measurements. Using the original Heyl test kit together with the corresponding refill pack ensures consistently reliable and accurate test results. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Refill pack: 1 set of TESTOVAL Silicate reagents for rapid manual analysis of the silicate content in water in the concentration range 0–10 mg/l SiO2. The individual values 0.25 mg/l, 0.5 mg/l, 1 mg/l, 2.5 mg/l, 5 mg/l and 10 mg/l can be read by optical colour comparison. By diluting the water sample in a ratio of 1:10 with distilled water, the measuring range can be extended to 10 times the concentration. The scope of delivery includes only test reagents A, B, C and D for simple concentration determination. 1 set of reagents Measuring time: approx. 19 minutes Analyses: approx. 100 Also available in the shop: Complete TESTOVAL dissolved silicate test kit: Order no. 410622 Replacement silicate colour comparison device: Order no. 410624

Testoval Iron 0-1 mg/L Test Kit ||/||| - Precise Iron Analysis Rapid iron determination with clear color reaction The Testoval Iron 0-1 mg/L color comparison kit is used to determine the iron content in water within a concentration range of 0-1 mg/L Fe. Individual values of 0.05 mg/L, 0.1 mg/L, 0.25 mg/L, 0.5 mg/L, 0.75 mg/L, and 1 mg/L can be read using an optical color comparison. The kit includes two reagents and a color comparison device for simple concentration determination. The color comparison kit enables reliable detection of low iron concentrations in water. By diluting the water sample at a 1:10 ratio with distilled water, the measurement range can be extended up to ten times. Fast and reliable determination of low iron concentrations in water The test kit is ideal for applications where low iron levels need to be reliably monitored, such as drinking water monitoring, water treatment, or technical installations. Advantages of the Testoval Iron 0-1 mg/L Test Kit The color comparison kit allows for a simple and rapid manual analysis of iron content with a clearly visible color reaction. The included color comparison device supports accurate evaluation and reduces user errors. By diluting the water sample at a 1:10 ratio with distilled water, the measurement range can be flexibly extended up to 10 mg/L Fe. This makes the test kit highly versatile and suitable for both routine checks and extended analyses. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Replacement color comparator without cuvette, for the TESTOVAL Chlorine DPD color comparison set for the concentration range 0.1-1 mg/l free and total chlorine. The individual values 0.1 mg/l, 0.2 mg/l, 0.3 mg/l, 0.5 mg/l, 0.75 mg/l and 1 mg/l can be read by optical color comparison. The three reagents are not included in the scope of delivery and can be ordered separately or also as a complete set. Analyses: approx. 70 Measuring time: approx. 1 minuteAlso in the assortment:1 set of reagents for approx. 70 analyses: Order no. 410521Complete set Testoval Chlorine DPD Method 0.1-1 mg/l: Order no. 410520

Colour comparison kit for the concentration range 0.1-1 mg/l Cl2 (free and total)   Individual values ... 0.1 mg/l 0.2 mg/l 0.3 mg/l 0.5 mg/l 0.75 mg/l 1 mg/l ... can be read by visual color comparison.    In addition to the three reagents a color comparison device for easy determination of concentration is included in the supply.   Analyses: approx. 70 Measuring time: approx. 1 minute   Refill packs: 1 set of reagents for approx. 70 analyses: Order no. 410521 Replacement colour comparison device: Order no. 410522

Color comparison kit for the rapid manual analysis of chlorine content in water in the concentration range 0.5-4 mg/l free and total chlorine. The individual values ... 0.5 mg/l 1 mg/l 1.5 mg/l 2 mg/l 3 mg/l 4 mg/l ... can be read by visual color comparison.  By diluting the water sample in a ratio of 1:10 with distilled water, the measuring range can be extended to 10 times the concentration. In addition to the two reagents a color comparison device for easy determination of concentration is included in the supply. Number of analysis: approx. 70 Measuring time: approx. 1 minutes Also in the range: 1 set of reagents for approx. 70 analyses: Order no. 410521 Replacement colour comparison device TESTOVAL Chlorine 0.5-4 mg/l: Order no. 410523

Spare color comparator TESTOVAL Iron for the concentration range 0-1 mg/l Fe.The individual values 0.05 mg/l, 0.1 mg/l, 0.25 mg/l, 0.5 mg/l, 0.75 mg/l and 1 mg/l can be read by optical color comparison. By diluting the water sample 1:10 with distilled water, the measuring range can be extended to 10 times the concentration. Only a color comparator for simple concentration determination is included in the scope of delivery.Reagents or the complete colorimetric test kit are also available in the store. Analyses: approx. 100 Measuring time: approx. 7 minutesAlso in our assortment: 1 set of reagents for approx. 100 analyses: Order no.: 410548 Complete Testoval test kit Iron (II) + (III) dissolved 0-1 mg/l: Order no. 410547

Testoval Phosphate Color Comparison Device – Manual Measurement Replacement color comparison device for quick and easy determination of phosphate in water The Testoval Phosphate Color Comparison Device is designed for fast visual determination of phosphate content in water. Measurement is performed manually via color comparison. Without the use of additional electronic equipment, concentrations from 0.25 mg/L to 10 mg/L P₂O₅ can be read directly using the color scale. The Heyl Testoval is suitable for both routine checks and simple documentation of results. Fast Phosphate Measurement via Color Comparison Without Equipment The Heyl color comparison device is specifically designed for applications requiring fast results and ease of use. By diluting the water sample 1:10 with distilled water, the measurement range can be extended tenfold. With the Testoval Phosphate Color Comparison Device, approximately 180 analyses can be performed, making it an economical solution for routine monitoring. Typical Applications of the Phosphate Color Comparison Device Manual phosphate determination is a proven method in many areas of water analysis, particularly where electronic measurement devices are unavailable or unnecessary. Environmental monitoring Water and wastewater analysis Laboratory applications Advantages of Phosphate Measurement with the Heyl Testoval Kit The Heyl Testoval Phosphate Test Kit offers a reliable, fast, and user-friendly way to determine phosphate content (P₂O₅) in water samples—completely without electronic devices or lab infrastructure. Fast on-site results: The colorimetric measurement provides usable results within minutes, ideal for routine checks, spot measurements, and immediate decisions. Easy handling without equipment: No electronic devices, power supply, or software are needed. Results are read visually via a color scale, making the device robust, error-tolerant, and easy to use. High practicality and mobility: Compact design allows mobile use—in the field, at measurement points, or in operational settings. Perfect where laboratory analysis would be too complex or time-delayed. Accuracy for monitoring and control: Provides practical accuracy for environmental monitoring, water and wastewater analysis, and brewing, allowing limits to be checked and trends detected early. Economical and efficient: With around 180 analyses per kit, the Heyl Testoval offers a cost-effective solution for regular measurements without maintenance, calibration, or follow-up costs for equipment. Extendable measurement range: Simple sample dilution (1:10) allows flexible expansion of the measurement range, increasing usability for higher phosphate concentrations.

Testoval® pH Chlor DPD Test Kit – Color Comparison for pH and Chlorine Quick and reliable determination of pH value and free and total chlorine in water The Testoval pH-Chlor DPD Test Kit is designed for rapid manual analysis of pH and chlorine. The pH measurement range is 6.8–8.0, while the chlorine content is measured in the range of 0–1 mg/L. The values pH 6.8, 7.4, and 8.0 as well as 0.1 mg/L, 0.5 mg/L, and 1.0 mg/L chlorine can be read safely using optical color comparison. Original Heyl Test Kit for Rapid Determination of pH and Chlorine The Testoval® pH-Chlor DPD Test Kit from Heyl is an original color comparison kit for rapid manual analysis of pH and both free and combined (total) chlorine in water. It was specifically developed for the requirements of swimming pool water monitoring. Advantages of the Original Testoval® pH-Chlor DPD Test Kit The Testoval® pH-Chlor DPD Test Kit combines two important water parameters in one set (pH and chlorine), enabling particularly efficient water analysis. With a measurement time of approximately 3 minutes per test, around 70 measurements can be performed – ideal for routine monitoring during operation. As an original Heyl product, the test kit ensures high measurement reliability, reproducible results, and maximum reagent compatibility. It helps operators maintain stable water quality, control disinfection processes, and reliably meet hygienic standards. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Heyl Testoval Phosphate Test Kit – Measure Phosphate Quickly by Hand Colorimetric test kit for easy determination of phosphate (P₂O₅) in water The Heyl Testoval Phosphate Test Kit allows simple and reliable determination of phosphate content (P₂O₅) in water samples. Measurement is performed colorimetrically via a visual color comparison and covers a range of 0 to 10 mg/L. The kit is a practical color comparison set for manual analysis of phosphate in water samples. The color develops within minutes after adding the reagents. By diluting the water sample 1:10 with distilled water, the measurement range can be extended tenfold. The kit allows for approximately 180 analyses in total. Fast Phosphate Analysis in Water Using Color Comparison The colorimetric method enables rapid determination of phosphate without complex equipment. After adding the reagents, the resulting color intensity is compared with a reference scale, allowing direct reading of the phosphate level. Due to its simplicity, the kit is ideal for routine checks, spot measurements, and applications where fast and reliable results are required. Typical Applications of the Phosphate Test Kit Manual phosphate determination is important in many areas of water analysis, particularly where nutrient levels must be monitored. Breweries Environmental monitoring Advantages of Phosphate Measurement with a Heyl Test Kit The Heyl Test Kit provides a simple, fast, and cost-effective way to measure phosphate content in water samples without the need for electronic devices or laboratory infrastructure. The colorimetric method delivers meaningful results within minutes. The main advantage: immediate results, allowing on-site assessment of whether phosphate levels are within acceptable limits, enabling quick response when needed. This is particularly useful for routine checks, spot measurements, or emergency testing. Easy handling: No special training or equipment required Mobility: Ideal for field measurements and decentralized applications Low cost: No purchase or maintenance of electronic devices needed Reliability: Proven method for reproducible results Flexibility: Can be used where no electricity or lab is available Why Phosphate Measurement Is Essential Phosphate is a key nutrient in water, but high concentrations can cause significant ecological and technical problems. Even small excesses can lead to algae growth, oxygen depletion, and deteriorating water quality. Regular phosphate monitoring is critical for: Environmental monitoring: Protect water bodies from over-fertilization Water treatment: Ensure compliance with legal limits Industry & breweries: Maintain stable process and product quality Wastewater management: Monitor the performance of treatment plants The Heyl Phosphate Test Kit enables fast, reliable, and lab-independent monitoring on site, allowing early trend detection and targeted interventions.

Testoval Silicate Test Kit – Color Comparison for Rapid Analysis Reliable manual determination of dissolved silicate in water The Testoval Silicate Test Kit is designed for rapid, manual analysis of silicate content in water in the concentration range of 0–10 mg/l SiO₂. Individual values of 0.25 mg/l, 0.5 mg/l, 1 mg/l, 2.5 mg/l, 5 mg/l, and 10 mg/l can be read using a visual color comparison. When reagents are added to the water sample, a characteristic color develops. The provided comparison scale allows easy reading of the concentration levels. By diluting the sample 1:10, the measurable range can be extended by a factor of 10. The kit allows for approximately 100 individual analyses, with each measurement taking about 19 minutes. Manual determination of dissolved silicate in water up to 10 mg/l The Testoval Silicate Test Kit enables reliable, manual analysis of dissolved silicate (SiO₂) in water. After adding the reagents, a characteristic color reaction occurs, which is evaluated using the included comparison scale. Diluting the water sample 1:10 allows flexible extension of the measurement range by a factor of 10. Why monitoring silicate in water is important Dissolved silicates play a crucial role in industrial water treatment, particularly in boiler feed water, cooling water, and reverse osmosis systems. Excessive silicate concentrations can lead to the formation of stubborn deposits (silicate scale), which are difficult to remove and significantly impair heat transfer and system efficiency. In membrane processes, silicate can also cause irreversible damage and significantly shorten membrane lifespan. Regular silicate monitoring allows early detection of limit exceedances, targeted process control, and prevention of costly system damage. The Testoval Silicate Test Kit thus supports safe process management and long-term operational reliability. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.