Astm d570 pdf free download

Time to saturation is strongly dependent on specimen thickness. For example, Table 1 shows the time to approximate time saturation for various thickness of nylon The effect upon these properties of change in moisture content due to water absorption depends largely on the type of exposure by immersion in water or by exposure to high humidity , shape of the part, and inherent properties of the plastic.

With nonhomogeneous materials, such as laminated forms, the rate of water absorption may be widely different through each edge and surface. Even for otherwise homogeneous materials, it may be slightly greater through cut edges than through molded surfaces.

Consequently, attempts to correlate water absorption with the surface area must generally be limited to closely related materials and to similarly shaped specimens: For materials of widely varying density, relation between water-absorption values on a volume as well as a weight basis may need to be considered.

Scope 1. This test method is intended to apply to the testing of all types of plastics, including cast, hot-molded, and cold-molded resinous products, and both homogeneous and laminated plastics in rod and tube form and in sheets 0.

The values stated in parentheses are for information only. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Referenced Documents 2. Apparatus 4. Significance and Use 3. This second function is particularly applicable to sheet, rod, and tube arms when the test is made on the finished product.

Test Specimen 5. Permissible variations in thickness are Current edition approved July 10, Published January Originally published as D — 40 T. Last previous edition D — Crank and G. Felder and G. Tolerance for the mm dimension is 62 mm and This test method and ISO 62 are technically equivalent when the test specimen described in 5.

When comparison of absorption values with molded plastics is desired, specimens 3. ASTM D pdf free. Long-Term lmmersion—To determine the total waterabsorbed when substantially saturated, the conditioned speci-mens shall be tested as described in 7. The difference between the substantially saturatedweight and the dry weight shall be considered as the waterabsorbed when substantially saturated. They shall then be cooled in a desiccator andimmediately reweighed. If the reconditioned weight is lowerthan the conditioned weight, the difference shall be consideredas watersoluble matter lost during the immersion test.

For suchmaterials, the waterabsorption value shall be taken as the sumof the increase in weight on immersion and of the weight of thewatersoluble matter. For long-term immersion procedure only,prepare agraph of the increase in weight as a function of the square rootof each immersion time. Send us a asym Wilton UK: For the water absorption test, the specimens are dried in an oven for a specified time and temperature and then placed in a desiccator to cool. Send us a request Need help or have a question?

Link to Active This link will always route to the current Active version of the standard. For materials of widely varying density, relation between water-absorption values on a volume as well as a weight basis may need to be considered.

Specimens are removed, patted dry with a lint free cloth, and weighed. Formally confirming that your products and services meet all trusted external and internal standards. Time to saturation is strongly dependent on specimen thickness. Consequently, attempts to correlate water absorption with the dd area must generally be limited to closely related materials and to similarly shaped specimens: Auditing Consulting Sourcing Training.

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