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ASTM D7532-09(R2021) pdf free download

ASTM D7532-09(R2021) pdf free download.Standard Practice for Determination of Re-tack Ability of Carpet Adhesives
1. Scope
1.1 This practice will provide a protocol for determining the effect of extended drying (open time) periods on the shear and peel strength performance of a carpet adhesive when bonding a carpet backing or standard duck cloth material to a substrate. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 Many of the terms in this test method are defined in Terminology D907. 3.1.2 re-tack, n—an industry term used to describe an adhesive performance characteristic when the original applica- tion is modified to include an extended adhesive open time period followed by re-application of pressure to bond the carpet to the substrate. 3.1.3 standard conditions, n—23 6 2°C (73 6 3°F) and 50 % relative humidity.
4. Summary of Practice
4.1 This practice is for a comparison of shear strength and 90 degree peel strength performance between a standard duck cloth material versus a specific carpet backing. Performance testing occurs after an applied test adhesive has been exposed to standard conditions ambient air for various open time periods. It should be noted that the use of duck cloth is necessary since there is no bench mark or standardized carpet backing currently produced in the United States.
5. Significance and Use
5.1 Selection of or development of a carpet adhesive, for direct glue or adhered applications requires knowledge of the adhesive’s ability to perform adequately when it is found necessary to correct an installation concern, such as bubbles or wrinkles, by re-rolling or application of dead weight to the affected area without the application or injection of additional adhesive. 5.2 Adhesive bonding of some carpet backings to substrates and the adhesive bonding of carpet backings to a pad foundation, double stick or glue application, require that prior to bonding the adhesive is to be dried sufficiently to allow for no transfer of adhesive as a result of slight finger pressure.
6. Apparatus
6.1 Applicator Trowel, with a notch pattern of 3.2 mm ( 1 ⁄ 8 in.) wide, 2.4 mm ( 3 ⁄ 32 in.) deep, 3.2 mm ( 1 ⁄ 8 in.) flat. N OTE 1—Adhesive manufacturer application instructions may recom- mend different trowel notching design. 6.2 Six 1 kg (2.2 lb) dead weights. 6.3 Testing Equipment in accordance with the test method to be implemented. 6.4 Timer.
11. Procedure
11.1 The adhesive application, open time, bonding, and testing are to occur at standard conditions. 11.2 With the application trowel at a 45° angle spread sufficient adhesive to cover the substrate bonding areas. Do not over apply and when completed start the timer for measure- ment of initial drying time. 11.3 During the first 60 min. of initial drying time, periodi- cally check for no transfer of adhesive with slight finger pressure. If necessary, continue the drying time past 60 min. until no transfer has occurred and record the time. N OTE 2—Bonding shall not occur at less than 60 min. 11.4 The extended drying time periods begin when 60 min. ofinitial drying has elapsed or after a longer initial drying time in order to achieve evidence of no transfer. 11.5 The test specimen assemblies are prepared at the conclusion of three different extended drying time intervals. The intervals are 4 h, 12 h, and 24 h. 11.6 When an open time interval occurs, prepare a set of three (3) test specimens with carpet and three (3) test speci- mens with duck cloth for each test method (Test Methods D6862 and D6004). There will be a total of six test specimens for each test method and each time interval. 11.7 On a flat horizontal working surface position the adhesive coated substrate facing upward. Position the carpet backing surface or either side of duck cloth, or both, to fully contact the test adhesive surface. Place a second piece of substrate to cover the top of the non bonded face of carpet and duck cloth swatch. 11.8 Place a 1 kg (2.2 lb) weight onto the top substrate. This dead weight load is positioned on center to provide a uniform load to the bonding area.

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