Quality: This varies according to the percentage of silicone in the sealant. Premium products have 100% silicone, cheaper products include fillers and solvent extenders. Premium silicones will have a longer life, zero shrinkage, better adhesion, better tooling and finish
Types: Silicones divide into two types according to the chemicals they contain to effect curing.
Neutral Cure – these are virtually odourless and the cured sealant is chemically neutral
Acetoxy Cure – these have a vinegary smell and release acid. They have poor adhesion on plastics and can stain metals
Elasticity: Low modulus products are more elastic and have greater movement. High modulus sealants have greater bonding properties
Anti-fungal: Sealants with anti-fungal additives to inhibit mould growth are used for sealing sanitaryware and in areas of high humidity. Premium sealants have more powerful anti-fungicides such as XS1