ASTM C907-2018 pdf free download
ASTM C907-2018 pdf free download.Standard Test Method for Tensile Adhesive Strength of Preformed Tape Sealants by Disk Method
1. Scope
1.1 This test method covers a laboratory procedure for determining the tensile adhesive strength of a preformed tape sealant. The type of failure can be determined, and the degree of cohesive/adhesive failure can be estimated. 1.2 The values stated in metric (SI) units are to be regarded as the standard. The values given in parentheses are provided for information purposes only. 1.3 The subcommittee with jurisdiction is not aware of any similar ISO standard. 1.4 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. 1.5 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.
4. Summary of Test Method
4.1 The preformed tape sealant is compressed between two aluminum disks. The disks are pulled apart in a tensile tester to failure. The maximum tensile strength and failure mode are recorded.
5. Significance and Use
5.1 Preformed tape sealants are tacky, deformable solids, that are used under compression between two or more substrates, in various sealing applications where the surfaces may be of similar or dissimilar materials. This procedure measures the tensile strength of the preformed tape sealant. It also provides an indication ofthe cohesive nature and adhesive bonding properties of the preformed tape sealant. This proce- dure is not intended to simulate actual use conditions.
6. Apparatus and Accessory Materials
6.1 Test Fixture, fabricated of aluminum (mill finish), in accordance with Fig. 1. N OTE 1—Other substrates may be substituted in 6.1. 6.2 Tensile Testing Machine, or equivalent, with a jaw separation rate of 51 mm (2 in.)/min. 6.3 Auxiliary Hardware, for attachment of the test fixture to the tensile tester. 6.4 Knife. 6.5 Compression Device, such as a vise, press, or equiva- lent. 6.6 Device, for recording the tension load in newtons (or pounds-force). 6.7 Solvent, such as xylol or toluol. 6.8 Wiping Cloths, lint-free.
7. Sampling
7.1 Samples to be tested shall be taken from a fresh roll of preformed tape sealant after first removing and discarding the first 600 mm (2 ft) of the roll. 7.2 Condition the sample at standard conditions for a minimum of 24 h before preparing the test specimens.
8. Test Specimens
8.1 Prepare two test specimens as follows: 8.1.1 Clean the surface of the test fixture with clean solvent to remove grease, oil, or residue from previous test, and dry. 8.1.2 Set the allen screw stop so that when the disks are assembled and the dowel is seated against it, the distance between the parallel disk surfaces is 3.2 mm (0.125 in.). 8.1.3 Place sufficient preformed tape sealant on the face of the fixture so that when mated with the matching face, the entire 3.2-mm (0.125-in.) gap will be filled. 8.1.4 After mating, uniformly compress the test fixture in the compression device until the dowel contacts the allen screw stop. Check to make sure the entire 3.2-mm (0.125-in.) gap is filled with sealant. Compress at the rate of 51 mm (2 in.)/min and hold in compression for 1 min. (Laboratories not able to comply should record the method used and approximate compression rate.) 8.1.5 At the end of 1 min, remove the assembly from the press device, taking care not to disturb it. 8.1.6 With a knife, trim all excess sealant from the periphery of the assembled fixture.
