ASTM D4966 PDF

Document Center Inc. Fabrics of all types may be tested by this method but difficulties may arise with fabrics with a pile depth greater than 0. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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. Significance and Use 5.

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Document Center Inc. Fabrics of all types may be tested by this method but difficulties may arise with fabrics with a pile depth greater than 0. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

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. Significance and Use 5. The between-laboratory precision of this test method is poor and, because of the nature of abrasion testing itself, technicians frequently fail to obtain results in agreement on the same type of testing instrument, both within and between laboratories.

Although this test method is not recommended for acceptance testing, it is useful because it is used widely, especially outside the United States. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question.

The test specimens then should be assigned randomly in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Students t-test for unpaired data and an acceptable probability level chosen by the two parties before the testing is begun.

If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results in light of the known bias. The abradant must be changed accordingly at frequent intervals or checked periodically against a standard.

With disposable abradants, the abradant is used only once or changed after limited use. With permanent abradants that use hardened metal or equivalent surfaces, it is assumed that the abradant will not change appreciably in a specific series of tests, but obviously similar abradants used in different laboratories will not likely change at the same rate due to differences in usage.

Permanent abradants also may change due to pick up of finishing or other material from test fabrics and must accordingly be cleaned at frequent intervals. The measurement of the relative amount of abrasion also may be affected by the method of evaluation and may be influenced by the judgment of the operator.

In general, they should not be relied upon for prediction of actual wear-life in specific-end uses unless there are data showing the specific relationship between laboratory abrasion tests and actual wear in the intended end-use.

It is not surprising, therefore, to find that there are many different types of abrasion testing machines, abradants, testing conditions, testing procedures, methods of evaluation of abrasion resistance, and interpretation of results.

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ASTM-D4966 Martindale Abrasion Testing Machine

More D The between-laboratory precision of this test method is poor and, because of the nature of abrasion testing itself, technicians frequently fail to obtain results in agreement on the same type of testing instrument, both within and between laboratories. Although this test method is not recommended for acceptance testing, it is useful because it is used widely, especially outside the United States. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. The test specimens then should be assigned randomly in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Students t-test for unpaired data and an acceptable probability level chosen by the two parties before the testing is begun.

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ASTM D4966 PDF

A number in parentheses indicates the year of last reapproval. Fabrics of all types may be tested by this method butdifficulties may arise with fabrics with a pile depth greater than0. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.

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ASTM D4966

Daishakar The face must sit flush and square inside the d Turn the power on. The machine should already be programmed to run a batch of movements. State the average number of movements required to rupture two or more yarns in a woven fabric or develop a hole in a knitted fabric.

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