Here are the key differences between polysulphide and polyurethane sealants:
- Chemical composition:
- Polysulphide: Made from liquid polymers containing sulphur atoms
- Polyurethane: Derived from the reaction of polyols with diisocyanates
- Durability:
- Polysulphide: Generally more durable and longer-lasting
- Polyurethane: Good durability but typically not as long-lasting as polysulphide
- UV resistance:
- Polysulphide: Excellent UV resistance
- Polyurethane: Fair to good UV resistance, may degrade faster in direct sunlight
- Chemical resistance:
- Polysulphide: Superior resistance to oils, fuels, and many chemicals
- Polyurethane: Good chemical resistance, but not as broad as polysulphide
- Flexibility:
- Polysulphide: Highly flexible, maintains elasticity over time
- Polyurethane: Good initial flexibility, may become less flexible with age
- Adhesion:
- Polysulphide: Excellent adhesion to various substrates
- Polyurethane: Very good adhesion, sometimes better than polysulphide on certain materials
- Curing time:
- Polysulphide: Generally slower curing
- Polyurethane: Typically faster curing
- Cost:
- Polysulphide: Usually more expensive
- Polyurethane: Generally more cost-effective
- Environmental impact:
- Polysulphide: May contain volatile organic compounds (VOCs)
- Polyurethane: Low-VOC options are available
- Application:
- Polysulphide: Often used in high-performance applications like aerospace and marine environments
- Polyurethane: Widely used in construction, automotive, and general industrial applications
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