ISO 23658:2020 pdf download

ISO 23658:2020 pdf download

ISO 23658:2020 pdf download.Buildings and civil engineering works — Sealants — Testing of adhesion properties using a bead peel test
1 Scope
The document specifies a method for evaluating the adhesion of sealants with a minimum elongation at break of 25 % (according to ISO 8339, Method A or B) on various substrates. This test method can be used for one-component and multi component sealants. This method is typically used for elastic sealants but can be also used for plastic sealants. For plastic sealants, the test can be more difficult and needs to be carried out by experienced technicians. This test is used to judge the adhesion of construction sealants in combination with cleaners, activators and/or primers on various substrates when exposed to a peeling force and also after different aging conditions. An adhesion test according to this document can also be conducted for process monitoring and quality assurance accompanying production. The test method described in this document is not intended to replace any adhesion cohesion test methods specified in ISO 11600.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6927, Buildings and civil engineering works — Sealants — Vocabulary
ISO 10365, Adhesives — Designation of main failure patterns
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6927 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Principle
Sealant beads are applied onto substrates. After any required conditioning and optional aging the beads are manually peeled from the substrate to determine the adhesion properties.
The failure pattern is then recorded.
5 Sample preparation
5.1 General
Depending on the objective of the test, more than one bead per substrate may be applied.
8 Peel test procedure
Grip the substrate in order to immobilize the test specimen prior to the peel test. To test the adhesion of the sealant bead, start by cutting (use of suitable safety gloves is recommended) the end of the sealant bead parallel or by using a bond breaker as described above to the bonding surface to free a tab which can be gripped by hand (~25 mm). Peel the sealant by pulling the cut end away from the bond surface by hand at a peeling angle of 130° to 160°. In case of 100 % adhesive failure only, pull off the bead from the substrate for 50 mm per ageing cycle. In case of cohesive failure, slowly increase the peeling force until the sealant begins to tear, then, as the failure progresses, cut the sealant again to the bonding surface. Always pull as close as possible to the tensile strength of the applied product. Continue to peel the sealant and cut again after sealant has begun to fail cohesively. There should be an interval of about 3 seconds between each incision, during which the material is subject to further strain. Repeat this process until a bead length of minimum 50 mm per ageing cycle is peeled off. The distance between the cuts should be approximately 3 mm to 6 mm (See Figure 6, Figure 7 and Figure 8).