Information on the most widely used ASTM standards within the materials testing industry
ASTM D1784: Standard Classification System and Basis for Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds
ASTM D1784 standard stipulated some kinds test for the materials strength, the material shall conform to the test requirements such as tensile strength and modulus of elasticity, conditioning, impact resistance, deflection temperature, and flammability.
| Tensile Strength and Modulus of Elasticity: | Test Method: ASTM D638 Speciment: Type I specimens of 3.2 6 0.4 mm (0.13 6 0.02 in.) ; thickness and testing speed of 5.1 mm (0.20in.)/min 6 25 %. Report tensile strength at the yield point if the material yields, otherwise at break. | ![]() |
| Impact Resistance (Izod) | Test Method: ASTM D256 Sample: using 3.2-mm (0.125-in.) thick specimens. The specimens may be compression-molded, extruded, or injection-molded with the provision that compression molded or extruded specimens built up as laminates in which complete fusion is obtained shall be acceptable. Complete fusion means there shall be no evidence of fraying or delamination at the break. | |
| Deflection Temperature | Test Method: ASTM D648–Method A Specimen: using 127 mm (5 in.) long, 12.5 mm (0.5 in.) wide, and 3.2 mm (0.125 in.) thick specimens under 1.82 MPa (264 psi) fiber stress. Materials that require high-temperature annealing prior to testing shall be annealed at 50°C (122°F) for 24 h or at the manufacturer's recommendation. Specimens shall be cooled in accordance with Procedure B of Practice D618. The test report for annealed specimens shall include the time and temperature of annealing used. | |
| Flammability | Test Method:ASTM D635. All compounds covered by this specification, when tested in accordance with Test Method D635, shall yield the following results: average extent ofburning of<25 mm; average time ofburning of<10 s. | |

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