Sealant
Navigation
Types and Durability
| Description
Sealants (Solvent based) |
Expected Lifespan
(Years) |
Adjustment Factors |
| Internal | ||
| Oil/solvent base
Oil based mastic, Butyl or bitumen rubber, Plastic but no elastic properties. |
5 | Constantly immerse in water or exposed to extreme moisture: -15% years
High possibility exposed to reactive chemical: -15% years Test certificate from local approved testing authority: +15% years |
| Acrylic
Acrylic (solvent type). Plastic and elastic properties. |
15 | |
| Polysulphide
2 part polysulphide to BS 4254 (mainly elastic properties). 1 part polysulphide to BS 5215 (mainly elastic properties). |
20 | |
| 1 or 2 part polysulphide not to BS 5215 or BS 4254 | <5 | |
| Polyurethane
2 part polyurethane (mainly elastic properties).1 part polyurethane (mainly elastic properties). |
20 | |
| Silicone
1 part low modulus silicone to BS 5889 Type A; elastic properties. |
20 | |
| Silicone sealant not to BS 5889 Type A. Also Type B to BS 5889. | <5 |
In the case of 2 or more condition of adjustment factor occur, the percentage of year shall be added to obtain the durability value.
Notes:
- Water based sealant, such as Acrylic emulsion sealant (instead of acrylic-solvent based) is commonly used in Singapore. However, it can only be used indoor or any place not in contact with water.
- Contact with organic solvents and other petroleum-based products can lead to degradation of some sealants.
- The use of a suitable primer will increase adhesion and weatherproofing, particularly on porous joint surfaces.
- Refer to the manufacturer for guidance on compatibility with paints/applied finishes and with other sealant materials.