ASTM C910:16(R2021) pdf free download – Standard Test Method for Bond and Cohesion of One-Part Elastomeric Solvent Release-Type Sealants.
7.2 Precondition the unopened containers of sealant at standard conditions for a minimum of 24 h.
7.3 Prepare three test specimens for each substrate to be tested, as follows: Using the polyethylene spacer bars to control the joint dimensions, form a bead of sealant 12.7 mm (½ in.) wide by 12.7 mm (½ in.) thick by 50.8 mm (2 in.) long between the parallel 25.4 mm (1 in.) by 76.2 mm (3 in.) long faces of two similar blocks or plates.
7.4 Condition these specimens by allowing them to set for 24 h at standard conditions, then drying them in a convection oven for 7 days at 50 ± I °C (122 ± 2 °F).
7.5 Place the specimens in freezer for 24 h at —23 ± 3 °C (—10 ± 5 °F). Dislodge spacer bars from sealant, but do not remove spacer bars from assembled specimens.
7.6 Remove specimens from the freezer and condition them for I h at standard conditions.
7.7 Place the specimens in a forced-draft oven for 7 days at 70 ± 2 °C (158 ± 3.6 °F).
7.8 Remove the specimens from the oven. Place them in a freezer fbr 24 h at —23 ± 3 °C (—10 ± 5 °F).
7.9 Place the specimens, while frozen, in the grips of the extension machine and extend the joint width from the original 12.7 mm (1/2 in.) to 14.29 mm (/I6 in.) at —23 ± 3 °C (—10 ± 5 °F) at the rate of 3.18 mm (½ in.)Ih. After extension is completed. record any initial failure. Then apply appropriate spacers to maintain 14.29 mm (/I6 in.) thickness, remove specimens with spacers in place from machine and allow to warm for 3 h at 23 ± 2 °C (73.4 ± 3.6 °F). At this time examine specimens for adhesive or cohesive failure.
8. Report
8.1 Measure and record the loss in adhesive or cohesive failure, or both, in square centimetres (or square inches) for each individual test specimen of mortar, glass. and aluminum.
9. Precision and Bias’
9.1 The precision and bias calculations for this test method are based on the results of four laboratories testing three materials using five specimens. The results are given in Table
10. Keywords
10.1 bend; cohesion; elastomeric; solvent-release sealant.