How can we evaluate whether polyethylene has been adequately crosslinked? One of the most widely used approaches is to determine its Gel Content and, when required, its Swell Ratio. ASTM D2765 describes test methods for determining the insoluble fraction produced by crosslinking in ethylene plastics. The methods are applicable to crosslinked polyethylene materials of different…
11.1 ObjectThis test method is intended to establish the ability of a fibre optic cable to withstand mechanical twisting. The primary purpose of this procedure is to measure any variation in the optical power transmittance of a fibre when the cable is subjected to torsional forces external to the cable jacket. A secondary purpose is…
faces. A jig as shown in Fig. 1 and capable of notching the specimens in accordance with 10.2 shall be used.NOTE 4—It is recommended that the jig be permanently mounted to ensure notching consistency.6.3 Specimen Holders—Lengths of hard or half-hard brass channel having the dimensions shown in (B) of Fig. 2 shall be used. The…
7 Apparatus7.1 Testing Machine— The apparatus shall be constructed essentially as shown in Fig. 2 and Fig. 3 and shall consist of the following: suitable base to withstand the impact shock; steel rod impact weight weighing 8 ± 0.2 lb (3.6 ± 0.1 kg);hardened steel impactors as specified in 7.1.1; a slotted guide tube 40…
10 Mechanical properties10.1 Mechanical strength10.1.1 Conduit systems shall have adequate mechanical strength. 10.1.2 Conduits, according to their classification, when bent or compressed, or exposed to impact or extreme temperature of a specified value in accordance with impact and temperature classification declared for the product, either during, or after, installation according to the manufacturer’s instructions, shall…
8. Measurement of Test Specimens 8.1 Measure dimensions up to and including 25 mm (1 in.) using a dial-type gauge with a minimum foot area of 650 mm2(1 in.2). Pressure on the foot shall be held to 190 +- 50 Pa (0.028 +- 0.007 psi). NOTE 2—Where foam is appreciably compressed by this test method,…
5 General characteristics 5.2 OpacityPolypropylene pipes that are declared to be opaque shall not transmit more than 0,2 % of visible light, when tested in accordance with ISO 7686. 7 Mechanical characteristicsWhen tested in accordance with the test methods as specified in Table 10 using the indicated parameters, the pipe shall withstand the hydrostatic (hoop)…
Physical Property Test Method Average Density ASTM-D3575 Comp Strength ASTM-D3575 @ 25% @ 50% @ 75% Tensile Strength ASTM-D3575 Tensile Elongation ASTM-D3575 Tear Strength ASTM-D3575 Comp Set @ 25% ASTM-D3575 Comp Set @ 50% ASTM-D3575 Buoyancy ASTM-D3575 Thermal Conductivity ASTM-C177 Thermal Resistance ASTM-C178 Service Temp ASTM-D3575 Water Absorption ASTM-D3575 Comp Creep ASTM-D3575 Flammability FMVSS-302 Chemical…
Main Quality Tests on PET Films are as below:
4 Test method4.1 GeneralThis part of IEC 60811 shall be used in conjunction with IEC 60811-100. Unless otherwise specified, tests shall be carried out at room temperature.4.2 Method A – Measurement of carbon black and/or mineral filler content in polyethylene by direct combustion4.2.1 Sample and test piece preparationA sample of the outer covering or sheath…
