BOSTIK BOSCODUR
Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium
Main features
- Solvent-Resistant Urethane Bonding
- Effective Cross-Linker for Nitrile
- 4 to 6-Hour Working Window
Product Description
Bostik Boscodur® 4L is a polyisocyanate curative designed for use with solvent-based adhesives and coatings where enhanced performance is required. Used as a cross-linking agent, it improves thermal stability, chemical and solvent resistance, and adhesion to challenging substrates including plasticized vinyl, treated polyethylene, polypropylene, and polyester film. The MEK-based formulation offers fast curing, quick processing, and flexibility for a wide range of industrial adhesive systems. :contentReference[oaicite:0]{index=0}
Key Features
- Effective polyisocyanate cross-linker for nitrile, chloroprene, polyester, and polyurethane adhesive systems.
- Improves thermal stability and chemical resistance of solvent-based adhesives and coatings.
- Fast cure rate with a recommended mixed working time of 4–6 hours.
- MEK-based formulation suitable for applications where alternative solvents may be restricted.
Applications / Suitable For
- Solvent-based adhesive formulations
- Industrial coating systems
- Nitrile adhesive systems
- Chloroprene adhesive systems
- Polyester adhesive systems
- Polyurethane adhesive systems
- Bonding plasticized vinyl, treated polyethylene, polypropylene, and polyester film
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Process MethodProcess Method
Crosslinking additiveProduct TypeProduct Type
Polyisocyanate curativeThermal Properties
Operating TemperatureOperating Temperature
N/A °CAdditional Information
Technical Properties
As-Supplied / Before-Processing Properties
| Property | Value | Unit | Method / Condition |
|---|---|---|---|
| Product type | Polyisocyanate curative | — | As supplied |
| Appearance | Brown liquid | — | Typical physical property |
| Density | 7.09 lb/gal (0.85 g/cm³) | — | Typical physical property |
| Flash point (S.C.C.) | 29°F (-2°C) | — | Supplier value |
| Solids content | 14 | % | Typical physical property |
| Isocyanate content | 4.2 | % | Typical physical property |
| Base | Polyisocyanate | — | Basic composition |
| Solvent | MEK | — | Basic composition |
| Shelf life | 9 months | — | Stored at 60–80°F (16–27°C) |
Technical Properties
After-Processing / Final-State Properties
| Property | Value | Unit | Method / Condition |
|---|---|---|---|
| Recommended addition level | 2–10 | % | Blend into adhesive or coating (Part A) |
| Mixed working time | 4–6 | hours | After mixing with Part A |
| Performance benefit | Enhanced thermal stability | — | Supplier description |
| Performance benefit | Improved chemical and solvent resistance | — | Supplier description |
| Performance benefit | Improved adhesion to plasticized vinyl, treated polyethylene, polypropylene, and polyester film | — | Supplier description |
