40T is a one-coat surface treatment which specially designed to bond elastomers, such as castable polyurethane, millable polyurethane, epoxy resin, phenolic resin and several special rubbers with metal and other rigid substrates. In special application, also can suitable for bonding between thermoplastic urethane and rigid substrates.
Features and Benefits
Versatile - suitable to various metal and non-metal substrate. Casting and molding process.
Fast Drying - Dries fast to allow rapid turnaround times through adopt special solvent.
Easy to Use - Can be applied by spray, dipping, polyester roller and brush application.
Environmental Resistance - Add durability for harsh environmental exposure, including high temperature, salt spray, solvent ambient and others environmental exposure.
Typical Physical Properties
|
Appearance |
Clear to Slightly Hazy Amber liquid |
|
Solid content |
20% - 25% |
|
Density (25°C) |
0.84 - 0.90 (g/ml) |
|
Brookfield Viscosity |
1200 - 2850 cps |
|
(25°C, 2#Spindle, 30 RPM)Solvent |
IPA, Ethanol, Toluene, MEK |
|
Closed Can Shelf Life (21-27°C) |
2 years |
* Data is typical and not to be used for specification purposes.
Chemical Composition
Several polymer resins are stably dispersed in organic solvents.
Application
Surface Preparation - Thoroughly clean metal surfaces prior to 40T application. Remove grease and dust from the metal surface, sandblast the metal surface to make its
surface roughness greater than 15 microns. For aluminum surface, we recommend using alumina as an abrasive agent to clean the dust remaining on the sandblast surface again.
Chemical methods can also be used, such as phosphating, passivation, electrophoresis, etc. Mixing - No agitation is required before application, and diluted 40T based on
application requirements. Use special thinner from usas diluent. The diluent should be added slowly in while agitation to avoid possible phase separation.
Brush - Use full strength, for large size or complex shape of the parts recommended a little dilution, dilution ratio of 100/30 to 80.
Spray - In order to avoid co-web (dry spray), it requires be diluted in spray application, recommended dilution ratio is about 100/60 to 150.
Dip - Dilution ratio of 100/150 to 300 is recommended for dipping application.
Adhesive Film - A dry film thickness of 15-30 microns is recommended for 40T.
Reach targeted dry film thickness will show obvious gloss.
Dry - Wet film must be dried completely to ensure solvent evaporation before cure, this will take 60 minutes or more at room temperature. The film may be force dried at higher
temperature for shorter periods of time. Maximum air flow at minimum temperatures (15-20 mins @50-60C good ventilated oven) also can give the required results.
Prebake - Parts coated with 40T may be vulcanized immediately after air-drying, while prebake can enhance cohesive strength. Prebake procedure: 1-2 hours @110-120°C is for normal parts, large parts maybe require increase bake time to 2-4 hours.
Cure/Vulcanization - Coated parts require complete molding procedures timely after prebaking, the cure time and temperature are the same as the process conditions required to vulcanize
the urethane compound being molded.