GB/T 3960-2016Plastics—Test method for friction and wear by sliding (English PDF)

GB/T 3960-2016 is the English-translated version of 塑料 滑动摩擦磨损试验方法.

GB/T 3960-2016, in the words of its clause 1, specifies the sliding friction and wear properties of plastics and their composites, and is applicable to the determination of the sliding friction and wear properties of plastics and their composites.

Its ten clauses are Scope; Normative references; Terms and definitions; Principle; Equipment; Test ring and specimen; Test conditions; Test steps; Results calculation and expression; and Test report.

Clause 4 states the principle: the specimen is installed on the test machine above the test ring, the load is applied, the specimen remains still and the test ring rotates at a certain speed.

Clause 6 fixes the test ring as generally 45# steel, quenched and heat treated to HRC40 to 45, with an outer diameter of (40 plus or minus 0.5) mm, an inner diameter of 16 mm and a width of 10 mm, chamfered all at 0.5 x 45 degrees, with a coaxial deviation below 0.01 mm and an outer surface roughness Ra of not more than 0.4 to be checked and recorded before each test, oil removed and the ring stored in a dry cylinder to prevent rust.

The same clause requires a rectangular specimen with a smooth surface free of bubbles, cracks, delamination, significant impurities and processing damage, the parallelism of its upper and lower surfaces not less than 0.02 mm, not less than 3 specimens per group, conditioned for more than 16 hours at a room temperature of (23 plus or minus 5) degrees C and a relative humidity of (50 plus or minus 5) % according to GB/T 2918 or to conditions agreed by the parties concerned; the specific size values of the specimen are missing from the page.

Clause 7 sets the test conditions, the specimen still, the test ring rotating at 200 r/min, a test time of 2 h and a load of 196 N with other loads allowed depending on the material, and states that the test can be carried out without lubrication as dry friction, after which the page breaks off.

Clause 3 takes its terms from GB/T 17754-2012 and repeats some of them, including sliding friction, friction, wear loss, friction coefficient, methods of lubrication and lubricant; the draft skips the definitions numbered 3.3 to 3.7 and leaves one definition, for a phenomenon and process of surface deformation, damage or gradual loss of surface material, whose term name it does not print.

Clause 2 cites GB/T 2918, GB/T 1033.1-2008 and GB/T 17754-2012, and the foreword lists the changes from the 1983 edition, among them an added statement of the standardized object, an added clause of normative references, the added principle of the test method, added conditions for the friction and wear test, the added characterization of the amount of wear and added requirements for the test report, together with modified terms, test equipment, test ring, specimen, test steps and requirements for the effective number of figures.

It replaces GB/T 3960-1983, was issued on December 13, 2016 and has applied since July 1, 2017.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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