Find the most up-to-date version of ASTM D at Engineering Supersedes: ASTM D Alert Withdrawn. Number of Included in: ASTM Volume ICS: – Volume – Textiles (II): D – LATEST. D – Designation: D – 04 Standard Test Method for Strap 1 This test method is under the jurisdiction of ASTM Committee D13 on.
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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
It is applicable to either woven or parallel cord textile structures from both natural and manmade? This test method may be used to evaluate tire cord adhesives fabric dipmetallic usually brass coatings on steel cord, and the process of adhesive reaction on the cord using one consistent form of tire cord or fabric and one consistent rubber compound.
This test method may be used to evaluate cords and fabrics in industrial hose and belting products and other cord or fabric reinforced rubber products. The inch-pound units in parentheses are provided in this test method are not necessarily exact equivalents of the SI units.
Either system of units may be used in this test method. 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. Current edition approved Oct. Originally published as D — Last previous edition D — Summary of Test Method 4. These two fabrics are laid one against the other, with cords in the same direction, to form the pad Fig. This pad has a nonstick fabric, such as holland cloth, separating the two fabric layers at one end for a sufficient distance to eventually permit adjacent ends of each 4 For referenced ASTM standards, visit the ASTM website, www.
The pad is cured in a plunger-type mold Fig. The force to peel one fabric layer from the other is determined in a recording tensile testing machine. These pieces are assembled on a clean? The assembled test pad is cured between heated platens rather than in the plunger-type mold of Fig.
Straps are cut from the cured pad in its long direction parallel to the cords, and the force to peel one fabric layer from the other is determined in a recording tensile test machine. Separate straps are prepared for warp and across-warp direction except in special cases see This system of adhesive treating facilitates the study of a large number of adhesion variables at minimum cost.
Material Test Machines and Equipment
This test method provides a good comparison of variables on adhesion because it produces both an average numerical value of peel force over several linear centimetres of cord and provides convenient specimens for assessing appearance see It may be used for purchase speci?
The more usual and convenient method for acceptance testing of such single cords is to prepare from a shipment a test piece or article in the same manner as the commercial article to be produced and to test cord-adhesion characteristics in this piece in a manner that compares its adhesion characteristics against a previously established, acceptable control. For steel cord, Test Method D provides convenient and rapid adhesion results.
The same basic test can be conveniently executed by the receiving customer for process control purposes by sampling rubberized fabric from that to be processed into? Rubber compound differences are only one of many parameters affecting peel force and appearance. Nevertheless, the expected range of values which characterize acceptable adhesion can be determined in any cord-rubber combination with experience.
Competent statistical help is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens which are as homogeneous as possible and which are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. 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 the light of the known bias.
Apparatus and Materials 6. The testing machine shall be equipped with an autographic recorder rectilinear coordinates preferred and? The recommended thickness gage of the skim stock varies from 0.
Excessive rubber stock moisture may lower adhesion of some? Rubber moisture content less than 0. Adhesion test compounds are usually replaced after six months; however, some may require replacement within a few weeks. Consider shipping containers of cord and rolls of fabric to be the primary sampling units.
Exercise caution in sampling and handling so that samples receive minimum exposure to ambient atmosphere prior to rubber embedment. NOTE 1—A realistic speci?
Preparation of Weftless Fabric 8. In a multi-item pad, orientation of the two weftless fabric pieces must be maintained so that individual cord items to be tested face each other in the? Preparation of Pads and Specimens 9.
The long dimension of this fabric is in the warp direction. Remove holland cloth backing and lay freshly-exposed surface up on a clean, nonstick surface. Remove holland cloth backing and place freshly-exposed surface against top of the? For steel cord, it may be required to use a backing fabric in place of the additional rubber or portion thereof in order to maintain integrity of the specimen during peeling on the tensile test machine.
Remove the specimen from the hot mold as quickly as possible and air-cool the specimen. Holland cloth or other nonstick material x4393 be used as the outside layer on either side of the? D — 04 appropriate for the cure rate of the rubber stock. Remove the specimen s from the hot platens as quickly as possible after curing is completed, and cool the specimen at ambient temperature. This windowed nonadhesive layer is used in place of the nonadhesive material speci?
The entire pad is then peeled on the tensile test machine without prior cutting of a mm wide strip as speci? In place of the additional rubber or as a part thereof on the outer sides of the primary fabric-rubber-fabric sandwich, place on the following: The asttm to 5-mm wider specimen in 9. Set the recorder chart for approximately half the crosshead speed.
With the specimen in the 4d393 of the tensile testing machine and under a tension less than that required to peel the specimen, stop the crosshead and cut through the rubber separating the two fabric layers to the surface of one of the fabric layers.
Restart movement of the crosshead, and peel a sufficient portion to obtain a peel force reading. Stop the crosshead and cut through the rubber to the opposite fabric face. Proceed to peel this second rubber fabric interface. Peel force in Section 11 shall be calculated separately for each face. Since there is a characteristic peak in force at beginning of peel, ignore the? Zstm, if tensile testing machine has such capability, average separation force may be read directly from the instrument display.
Determine adhesion force by one of the options in Describe the products sampled and the method of sampling used. If peel site was manipulated in the tensile test machine as directed in Note testing on CRT tester as a deviation, since separation rate and results will differ from those from a CRE tester.
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