HFS-903
Non-combustible Silicone Sealant

Non-combustible silicon sealant HFS - 90 is a highly fire-resistant and non-flammable silicon sealant which is composed of single compound. This sealant is halogen free, non-toxic and almost smokeless. HFS-90 is ideal for sealing or bonding of fire-resistant products used in hot conditions, due to their wide range of application temperatures and especially high temperatures. Because this product has remarkably high melting point and excellent adhesive properties which are certified by marine class , HFS-90 would be specialized in Offshore project and shipbuilding. With its strong adhesion HFS - 90 will satisfy the user as the best domestic silicon product that can be expanded not only for general silicon use but also as an alternative to welding partially.

Applications
Sealing high-temperature elements

Features
Strong adhesion
Halogen free
Nontoxic and almost smokeless
High temperature service compound
Highest level of fire-resistance

Specifications

Limitations
- Cannot be overpainted.
- Not intended for structural glazing.
- Do not allow sealant to come in contact with solvent during cure.
- Do not allow sealant to come in contact with curing polyurethane sealants during cure.
- Not intended for immersion.
- Sealant may be applied below freezing temperatures if substrates are completely dry, frost free and clean.
- Contact Technical Service for more information.
- Do not apply when substrate temperatures are below -20°F or above 130°F.
- Not recommended for absorptive surfaces such as natural stone,
   particularly limestone or marble where staining may occur test before use.
- Brass or copper may be discolored. Test prior to application.
- Do not apply to surfaces that will be painted as sealant surface will not hold paint
- Do not apply to substrates that bleed oil, plasticizers or solvent.
- Do not apply to damp or wet substrates.
- Lower temperature and humidity will extend tack free and cure rates.
- Test sensitive substrates, such as mirror backings, for compatibility before use.

Caution
- Direct eye contact may cause irritation.
- Eye contact may cause conjunctivitis,corneal damage, or severe chemical burns
- May cause skin irritation and sensitization.
- May be harmful if swallowed
- Product contains oximes, possible skin sensitizers.