ASTM C338-93 Assessing the Softening Points of Glass

ASTM C338-93 Assessing the Softening Points of Glass

ASTM C338-93 is a test method that measures the ‘flow points’ or temperature at which the viscosity of glass reaches 105 poise. It uses a flow point apparatus to estimate the softening points accurately. The information is helpful in the development and research of glass.

  • Average 30% Cost
    Savings

  • 100% Confidentiality
    Guarantee

  • Free, No-obligation
    Consultation

  • 100% Customer
    Satisfaction

    TRUSTED BY ENGINEERS FROM

    Scope:

    ASTM C338-93 is a test method that measures the ‘flow points’ or temperature at which the viscosity of glass reaches 105 poise. A glass fiber of 0.65 mm diameter and 235 mm length begins to elongate under its own weight at the rate of 0.1mm/min as the upper 100 mm of the glass fiber is being heated in a particular furnace at the rate of 5 ± 1° C/minute. ASTM C338-93 helps identify the unique changes in glass composition and thus is essential to maintain the desired composition. It also helps to evaluate the melting point of the glass.

    Procedure:

    ASTM C338-93 uses a flow point apparatus to identify and evaluate the glass’s softening point (flow point). The device has the following components: glass sample, current contactor, small incandescent lamp, plastic flag that provide active load, platinum-rhodium heating coil, transformer, photocell, variac, voltmeter, amplifier, and clock. The transformer powers the platinum-rhodium heating coil. The variac actuates 50 Volts to it, and the reading is taken from the voltmeter. A plastic flag (partially blackened) is attached to the given sample that provides the active load. It hangs between the photocell and the small incandescent lamp and thus blocks the light. The signals produced can be studied on the amplifier that receives signals from the photocell.

    Specimen Size : 

    For ASTM C338-93, a glass fiber of 0.65 mm diameter and 235 mm length is used.

    Data:

    The data is interpreted from graphs produced on the amplifier.

    Conclusion:

    ASTM C338-93 is a test method that measures the ‘flow points’ or temperature at which the viscosity of glass reaches 105 poise.

    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

            ddd

            Let us combine our capabilities to achieve success!!

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