Sitting in the Handyvan today, enjoying a well earned cuppa, reading a Toolsatan catalogue.
Looking at silicone sealants I noticed they do High modulus and low modulus and there are Acetoxy and neutral cure ones. Never known what that means, so I e-mailed Evo Stick from my smartphone to ask. Got the following reply, which might be informative.
----------------------------------------------------------------- Essentially there are four different terms, commonly used in the description of silicone sealants, for DIY/building applications.
High modulus and low modulus refer to the modulus of elasticity. A high modulus rubber is a harder tougher material, suited to low movement joints such as around baths and washbasins. Low modulus rubbers are softer, deform more easily, and are better suited to use in movement joints, such as in external applications.
Acetoxy and neutral cure refer to the different chemistry of the curing (setting) reaction.
Acetoxy silicones have a strong smell of vinegar, which is acetic acid, and are generally high modulus. These sealants bond extremely well to glass and glazed tiles, but the acid may attack some surfaces such as metals and some plastics.
Neutral cure products have a different smell, contain no acid, and bond extremely well to concrete, brick, most metals and most plastics. They are generally low modulus. (Neither of them bond to polyethylene or polypropylene.)
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