ASTM D3575 PDF

Product requirements are outlined in Specification D It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Multi-user access to over 3, medical device standards, regulations, expert commentaries and other documents. Worldwide Standards We can source any standard from anywhere in the world.

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Standard Test Method f ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. Product requirements are outlined in Speci? It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability or regulatory limitations prior to use.

Referenced Documents 2. Terminology 3. Summary of Test Methods 4. Where the test method is not included, it shall be arranged between the purchaser and supplier. Current edition approved Aug. Published November Originally published as D — Last previous edition D — No reproduction or networking permitted. Also, the apparent density is affected by the number of cut surfaces as opposed to the number of skin-covered surfaces on the test specimen.

When differences due to the difficulty in obtaining suitable test specimens from the? This can be done by comparing the results of standard test specimens and those obtained on actual parts. Conditioning 7. The product shall be conditioned, unde? Measurement of Test Specimens 8. Pressure on the foot shall be held to 6 50 Pa 0. NOTE 1—Where foam is appreciably compressed by this test method, foot area and loading shall be as agreed upon between the purchaser and the supplier.

NOTE 2—Thickness of materials having irregular surface characteristics shall be measured as agreed upon between the purchaser and the supplier.

Sampling 6. Randomly select representative samples of the lot being examined, as required. The apparent density and the state of crosslinking may vary in different parts of the?

Take care not to distort the test specimen. Precision 9. The reproducibility of these test methods is being determined and will be available on or before April NOTE 3—The repeatability study was performed on two materials in two laboratories.

D closed-cell ole? For density Method A , compression de? Scope Apparatus Test Specimens Specimens less than 25 mm in thickness shall be plied up, without the use of an adhesive, to produce a total thickness of 25 mm. NOTE 4—To obtain accurate data when testing foams with large cells or irregular surfaces, or both, larger samples approximately by by 25 mm 4 by 4 by 1 in. Report Precision The reproducibility of this test method is being determined and will be available on or before April Values of data ranged from Compression Set 1 2 3 4 5 6 7 8 9 10 Average Standard deviation NOTE 6—Compression de?

Number of Specimens The values reported shall be the mean of those observed. Procedure Measure the? Calculation The apparatus shall be arranged to support the specimen on a level horizontal plate.

Specimens less than 25 mm thick shall be plied up, without the use of cement, to a minimum of 25 mm. NOTE 7—Specimens less than 25 mm 1 in. Compress the specimen 25 6 0. NOTE 8—Where foam is appreciably compressed by this pretestpressure, foot area and loading shall be as agreed upon between the purchaser and the supplier. Test Method D Suffix L—Water Absorption The specimen may or may not have natural skins on top, bottom, or both surfaces. Then place the specimens in a stream of air for the minimum time required to remove visible water from the surfaces and reweigh.

Compression De? Values of data ranged from 0. Values of data ranged from 0 to 3. See Test Method F NOTE 9—Approximate drop height is 60 cm 24 in. Suffix S—Thermal Stability Test Specimen NOTE 10—An alternative test method is to cut by mm 12 by in. See Test Methods D Suffix V—Thermal Conductivity Test Method A Test Method B Suffix W—Density NOTE 11—Larger specimens may be necessary when testing coarse cell foams.

D NOTE 12—This test method is particularly appropriate when testing small or irregularly shaped samples. NOTE 13—Larger specimens may be necessary when testing coarse cell foams or foams with irregular surfaces. Insert the lid in the vessel. NOTE 14—It is not advisable to ply up layers because this could cause entrapment of air between the layers giving erroneous results. Values of data ranged from 58 to Buoyancy 1 2 3 4 5 6 7 8 9 10 Average Standard deviation 58 Summary of Test Method By measuring the change in thickness with time, creep properties of the foam material can be obtained.

Provisions shall be made for applying a force to the movable platen. The base plate and movable platen shall have minimum dimensions of by mm 4. The force shall be applied to the movable platen at a pivot point located at the geometric center of the platen. A dial micrometer shall be attached to the base plate or frame of the apparatus to permit continuous measurements of the travel of the movable platen.

Any force-inducing mechanism that does not interfere with measurement of the movement of the movable platen is acceptable. A suitable apparatus is shown in Fig. The thickness shall not exceed half of the lateral dimensions. The values reported shall be the mean of these observed. Record this value as the original thickness T. With the removable platen in contact with the base plate, position the dial micrometer to read thickness at the geometric center of the platen and adjust the micrometer to read zero.

Raise the movable platen and center the test specimen under the movable platen on the base plate. Using appropriate means, apply the force agreed upon between the purchaser and the supplier, to the test specimen by placing the standard masses gently on the platen. Measure the total force. Start to measure the thickness of the test specimen while under load 60 6 5 s after the force has been applied.

Record this thickness as the initial thickness under force Ti. More frequent readings are recommended to establish a creep versus time curve. Record the thickness at each speci?

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