BS ISO 16938-2:2019

This standard BS ISO 16938-2:2019 Buildings and civil engineering works. Determination of the staining of porous substrates by sealants used in joints is classified in these ICS categories:

• 91.100.50 Binders. Sealing materials

This document specifies a method for determining the staining of porous substrates (e.g. marble, limestone, sandstone, or granite) by sealants used in building construction. The method evaluates the likelihood of a sealant causing an early stain on a porous substrate due to exudation of materials from the sealant. The outcome of the test is specific to the tested sealant and tested substrate and cannot be extrapolated to other sealant formulations or other porous substrates. During this accelerated test, if the sealant does not stain or discolour the substrates, it does not mean that the tested sealant will not stain or discolour the tested porous substrate over a longer time period.