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High functionality polymeric MDI with excellent reactivity and processing window for flexible formulation design.
Consistent batch-to-batch quality ensuring reliable cure kinetics and mechanical performance in final products.
Low monomeric MDI content (< 0.5 wt%) meeting stringent occupational health and safety requirements.
Good compatibility with polyols, chain extenders, and additives across diverse PU systems.
Enables production of rigid and semi-rigid foams with superior dimensional stability and thermal insulation properties.
Rigid polyurethane insulation foams for refrigeration and building envelope applications.
Semi-rigid automotive seating and interior trim components.
Industrial spray-applied insulation systems for tanks and pipelines.
Structural sandwich panels with metal or composite facings.
One-component moisture-cured sealants and adhesives requiring controlled reactivity.
| Chemical Type | Polymeric diphenylmethane diisocyanate (pMDI) |
| Product Form | Liquid |
| Appearance | Clear to slightly hazy amber liquid |
| Functionality (avg.) | 2.7–3.1 |
| NCO Content (wt%) | 31.0–32.5 |
| Viscosity at 25°C (mPa·s) | 150–250 |
| Monomeric MDI Content (wt%) | < 0.5 |
| Storage Stability (unopened, 25°C) | ≥ 6 months |
Q1: What is the primary function of BASF M20S in polyurethane systems?
A: BASF M20S is a polymeric methylene diphenyl diisocyanate (MDI)–based curing agent designed to react with polyols and other active hydrogen-containing components, forming crosslinked polyurethane networks. It enhances thermal stability, mechanical strength, and chemical resistance in final cured products.
Q2: Is BASF M20S suitable for moisture-cure or one-component (1K) PU formulations?
A: No — BASF M20S is formulated for two-component (2K) polyurethane systems. It requires precise metering and mixing with compatible polyol resins prior to application. It is not intended for ambient-moisture-cure applications, which typically rely on monomeric or blocked isocyanates.
Q3: How does M20S compare to monomeric MDI or TDI in terms of handling and reactivity?
A: As a polymeric MDI variant, M20S offers lower vapor pressure and reduced volatility compared to monomeric isocyanates, improving workplace safety during handling. Its reactivity is moderated relative to TDI, allowing for broader processing windows in casting, coating, and elastomer applications while maintaining robust cure performance.
Q4: What are typical storage and handling recommendations for this product?
A: Store in tightly sealed containers under dry, inert conditions (e.g., nitrogen blanket) at temperatures between 15 °C and 30 °C. Prolonged exposure to moisture or elevated temperatures may cause viscosity increase or gelation. Always follow industrial hygiene practices, including appropriate PPE and ventilation, when handling isocyanate-based materials.
Q5: Can BASF M20S be used in flexible or rigid foam applications?
A: BASF M20S is primarily engineered for non-foam applications such as high-performance coatings, adhesives, sealants, and cast elastomers. While polymeric MDIs are commonly used in rigid foams, M20S’s specific formulation emphasizes functionality and compatibility in solvent-free or low-VOC 2K systems rather than foam expansion or cell structure control.
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