ASTM C370 Test for Moisture Expansion of Fired Whiteware Products

ASTM C370 test method is used to determine the elongation of whiteware bodies caused by rehydration as a result of autoclave treatment.

  • Average 30% Cost

  • 100% Confidentiality

  • Free, No-obligation

  • 100% Customer



    ASTM C370 test method helps to determine the increases in the physical dimension of fired whiteware materials called moisture expansion. Moisture expansion is the tendency of matter to change in volume in response to a change in moisture content. The macroscopic effect is similar to that of thermal expansion but the microscopic causes are very different. Moisture expansion is caused by hygroscopy. Changes in physical dimensions from water can influence the integrity and stability of a material. In the case of glazed ware, moisture expansion can lead to crazing. Crazing is the phenomenon that produces a network of fine cracks on the surface of a material.

    Test Procedure:

    In ASTM C370, the specimen is measured and marked. It is placed in an autoclave where it is subjected to steam pressure. After a 5-h treatment, the steam pressure is relieved by opening the blow-off valve. The specimen is removed from the autoclave and dried to constant weight at a temperature not exceeding 110°C and the specimen is then cooled to room temperature. The specimen is measured again. 

    Video 01: How to use an autoclave?

    Specimen size:

    For ASTM C370, the specimens should be unglazed. It should be rod-like in shape, 3 to 4 inches long. It should be cut from the center of production pieces of ware. The specimen’s thickness must not exceed 0.75 inches, and the least dimension should be not less than 0.10 inches. At least five specimens are required.


    The percent of moisture expansion is reported. 


    ASTM C370 test method helps to determine the increases in the physical dimension of fired whiteware materials called moisture expansion.


    Core Materials Testing Services


    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

          You ship your sample to us or arrange for us to pick it up.

          STEP 03

          We deliver the test report to your email.

          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


            Let us combine our capabilities to achieve success!!

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