Shenyang TX Testing Instruments Inc.
Shenyang TX Testing Instruments Inc.

GRP Hardness Tester Structure and Working Principle

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    Oct 22 , 2021

    GRP hardness tester is a kind of indention hardness tester. It is widely used in Fiber Reinforced Plastics industry, most of Fiber Reinforced Plastics products are required to test Barcol hardness.

    The structure of GRP hardness tester is illustrated in Fig.1.


    Structure of the Instrument

    Fig. 1 Structure of the Instrument


    The main testing system of GRP hardness tester is set in the frame. The indenter is in the full scale adjusting screw (indenter sleeve) with a plunger loaded by load spring on top. The test force applied on indenter by load spring through plunger is adjusted by load adjusting screw. The plunger moves up and down along with indenter, thus, the dial indicator shows hardness reading through the lever. The legs fixed at the back of the frame can insure the indenter be perpendicular to test surface. The enclosures at both left and right sides protect the inner system from being damaged and changed.


    The top of indenter is 0.76mm, equivalent to 100 degrees upper on the top surface of full scale adjusting screw when the hardness tester is under nonworking condition. The indicator pointed on zero at this moment.

    Joanna Zhao
    Joanna Zhao

    Hi, I'm Joanna Zhao, the Import & Export Manager of Shenyang TX Testing Instruments Inc. I've been with TX Testing for 15 years, gaining hands-on experience by closely observing the production process and personally assembling and testing our portable hardness testers. This has deepened my technical understanding and strengthened my confidence in the industry's development. With this foundation, I provide professional support, feasibility analyses, and customized solutions to meet diverse customer needs, offering one-stop services that ensure efficiency and satisfaction.

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