These are relatively new products. These are polyethers terminated with silyl groups. Most of these sealants are one component that is cured by reaction with ambient air humidity. They cure at a speed of 3 mm/day, faster than one component PU. Their key properties and applications are listed below.
Properties
Applications
Skin over time 15 to 20 minutes.
Service elongation 25%, elongation at break 150 to 350%, elastic recovery higher than 70%.
Tensile strength 1 MPa, modulus .8 MPa.
They meet the ISO standard 11600g, class 25hm (high modulus) They have excellent adhesion on metals, plastics, wood, ceramics, without primers.
Excellent resistance to weathering, to water, they can withstand at least 15 years of service life, but we do not have a longer experience so far, except in Japan.
Although they have good adhesion to glass, they are not recommended for that because long exposure to UV would degrade this adhesion.
Shore a hardness around 40.
Expansion joints on concrete and metals.
Joints around windows and doors.
Joints on natural stones, because they do not stain these stones.
Glazing between double insulated windows and metal, PVC or wood frames.
Bonding and jointing wood parquets inside and outside (ship decks).
Take the course by Industry expert William D. Arendt, where he will present a unified approach to explain the silane technology (silyl modified polymers, silane additives…), and practical applications (construction sealants, PSA, roof coatings…) to enable better formulation design aligned with specifications (eliminating N=C=O group).
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