SINOMER® PM839: A Low-Temperature Rapid Curing Agent for Two-Component Epoxy Systems

Product Overview

SINOMER® PM839 is a thiol-terminated polymer curing agent (CAS 72244-98-5) designed for fast, low-temperature curing in epoxy resin systems. As a high-performance alternative to traditional products like Capcure 3-800 or Gabepro GPM-800, it enables efficient crosslinking while maintaining excellent mechanical and chemical resistance.

Key Features

• Low-Temperature Efficiency: Cures rapidly at ambient or mildly elevated temperatures, reducing energy consumption.

• High Reactivity: Thiol (-SH) groups ensure fast reaction with epoxy resins, even in thin-film applications.

• Versatility: Compatible with amines, polyamines, or hybrid curing systems.

• Low Volatility: Minimal VOC emissions (<1.2%), ideal for environmentally sensitive applications.

Technical Specifications

Appearance:Colorless transparent liquid

Mercapto Equivalent: ≥3.0

Viscosity (25°C): 12,000–14,000 mPa·s

pH (1% aqueous solution): 5.00–7.00

Total Chlorine Content: ≤800 ppm

Applications in Two-Component Epoxy Systems

Electronics Encapsulation

Anticorrosive Coatings

Jewelry and Craftwork Bonding

PV Silicon Wafer Processing

Advantages Over Conventional Curing Agents

Recommended Formulation (Example)

• Epoxy Resin: 60–70%

• SINOMER® PM839: 20–30%

• Amine Accelerator: 5–10% (e.g., DETA, TETA)

• Additives: Fillers, pigments, or flow agents (as needed).

Process:

1. Mix epoxy resin and SINOMER® PM839 at room temperature.

2. Add amine accelerator and blend until homogeneous.

3. Apply to substrate; curing initiates within 30–60 minutes at 25°C.

Safety and Handling

• Storage: Keep sealed in a cool, dry place under nitrogen atmosphere.

• Protection: Use gloves and goggles; avoid skin/eye contact (see SDS).

• Environmental Compliance: Biodegradability <26% (OECD 301B); dispose via licensed waste handlers.

Why Choose SINOMER® PM839?

• Cost-Effective: Reduces energy costs with low-temperature curing.

• Performance-Driven: Matches or exceeds industry benchmarks for hardness (≥3H) and chemical resistance.

• Sustainability: Halogen-free and aligned with green chemistry principles.

Explore SINOMER® PM839 for your next epoxy project! For technical datasheets, samples, or formulation support, contact:

Sinocure Chemical Group

Email: info@sinocurechem.com | Tel: +86 15668330235

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