Which joint sealant is better, acrylic, polysulfide, polyurethane or silicone?
Posted in Highway Engineering |
Email This Post
There are four generic types of joint sealant with high performance. Their properties are highlighted in the following table:
| Acrylic | Polysulfide | Polyurethane | Silicone |
| Accommodate 12% movement. | Poor recovery
in high cyclic movements |
Accommodate
50% movement. |
Accommodate
50% movement. |
| Exhibit shrinkage upon curing | Exhibit excellent
chemical resistance |
Excellent bonding, can
be used without primer |
Excellent low temperature
movement capability |
| Solvent-based. | Good performance in submerged conditions. | Good UV
resistance |
Excellent UV and heat stability |
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
