Name: IPDI Sealant Prepolymer IPS-300
Brand: Coatingsink
SKU: ipdi-prepolymer-sealant-ips
Availability: InStock

Question 1

Why use an IPDI-based prepolymer instead of MDI or TDI for sealant applications?

Accepted Answer

IPDI (isophorone diisocyanate) is an aliphatic diisocyanate, so the resulting polyurethane network lacks aromatic chromophores. This prevents UV-induced yellowing and chain scission, making IPS-300 the preferred choice for glazing compounds, structural glazing sealants, and any application where color stability on prolonged outdoor exposure is critical.

Question 2

What chain extenders or crosslinkers are compatible with IPS-300?

Accepted Answer

IPS-300 is typically cured with polyamines (e.g., IPDA, MOCA) or polyols paired with a tin or bismuth catalyst. For one-component moisture-cure formulations, no curative is needed — atmospheric moisture hydrolyzes the NCO groups directly. Aim for a stoichiometric NCO:NH₂ or NCO:OH ratio of 1.05–1.10 for optimal mechanical properties.

Question 3

What is the recommended storage condition and shelf life for IPS-300?

Accepted Answer

Store in tightly sealed, nitrogen-blanketed drums at 10–25°C, away from moisture and direct sunlight. Under these conditions shelf life is 9 months from date of manufacture. Prolonged exposure to humidity will cause NCO loss through moisture reaction; always verify NCO content by titration before use if drums have been opened.

NCO Content	2.5 ± 0.2%
Density (25°C)	1.10 g/ml
Isocyanate Base	IPDI (aliphatic)
Moisture Content	≤ 0.05%
Viscosity (25°C)	8,000–14,000 mPa·s

IPDI Sealant Prepolymer IPS-300

Specifications

FAQ

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