Determination of Hydrolyzable Chlorine of Isocyanates ASTM D4663-20

Determination of Hydrolyzable Chlorine of Isocyanates ASTM D4663-20

ASTM D4663-20 test method helps determine how carbonyl chloride and dissolved phosgene serve as the main source of hydrolyzable chlorine in the Isocyanates. A wide range of Isocyanates, including toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, their mixture, or other Isocyanates with the same solubility are studied for their hydrolyzable chlorine content.

    Scope:

    The ASTM D4663-20 test method is important to determine the hydrolyzable chlorine content in Isocyanates, how it is formed, and how its constituents react with alcohol and water to produce urea, carbonates, carbon dioxide, and hydrochloric acid. This test method is important to get accurate readings at different sample concentrations. It defines a standard to control the quality of Isocyanates.  It characterizes the toluene diisocyanates found in polyurethane products and is applicable for research purposes. Hydrolyzable chlorine content provides information about the performance of Isocyanates in polyurethane systems which helps specify their reliability.

    Procedure:

    The sample is taken as per the requirements and poured into a 400 mL beaker. 50 mL of methanol is stirred with the sample until the beaker becomes hot, and crystals show up. Hydrochloric acid is produced by reacting hydrolyzable chlorine with methanol. Then water is added and the reaction mixture is boiled for 30 minutes. The beaker is cooled, and nitric acid is added. Then the chlorides are determined through potentiometric titration with silver nitrate solution.

    Specimen size:

    The sample size is taken as per the requirement. Nine to 11 grams of sample is weighed and poured in a 400 mL beaker. 18 to 22 g of sample is used if hydrolyzable chlorine content is lower than 0.01%.

    Data:

    The hydrolyzable chlorine as weight percent can be calculated as follows:
    Hydrolyzable chlorine, % ꞊ 35. 45 ×A × N × 100/(1000 × W )
    ꞊ 3.545 × A × N/W
    Where: A = silver nitrate solution required for titration of the sample, mL.
    N = normality of the AgNO3 solution, meq/mL.
    W = sample used, g, and 3.545 = constant combining the atomic weight of chlorine.

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      Send us a request

        Process for testing
        •  

          STEP 01

          You share material and testing requirements with us

        •  

          STEP 02

          We ensure your sample pick-up in an ensured manner

        •  

          STEP 03

          We deliver test report to your inbox

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Free, no-obligation consultation
          • Guaranteed confidentiality
          • Quick turnaround time
          • Hassle-free process

            idea icon
            Want to connect with an expert before you leave?