Core Mechanism: Polymercaptan (-SH) chemistry enables ultra-rapid crosslinking and deep cure with epoxy resins at ambient and low temperatures (down to -5°C) as well as in thin-film applications.
SINOMER® PM839 (Base Polythiol): High-purity unaccelerated polymercaptan. Exact equivalent to Capcure 3-800, GABEPRO GPM-800, Polythiol QE-340M, and Thiocure1200. Offers formulators total freedom to adjust gel time with tertiary amines (e.g., DMP-30).
SINOMER® PM840 PA (5-Minute Fast Cure): Pre-accelerated ready-to-use polythiol system. Delivers 5–8 min gel time (direct drop-in alternative to GABEPRO GPM-888).
SINOMER® PM841 M (30-Minute Extended Cure): Modified polythiol system providing 25–30 min pot life for larger part bonding, potting, and lamination (equivalent to GABEPRO GPM-830CB).
Tailored Customization Service: Sinocure Chemical provides custom mercaptan synthesis with adjustable gel times, custom viscosities, and low-odor profiles to match proprietary dispensing systems.
Conventional amine and polyamide epoxy hardeners suffer from significant performance drops in cold environments (below 10°C) and often exhibit sticky surface tack due to moisture/CO₂ amine blushing in thin-film applications. When structural adhesives, fast-repair kits, electronic sealants, or road markings demand immediate handling strength and reliable low-temperature reactivity, Polymercaptan (Polythiol) curing agents represent the premier chemical solution.
Sinocure Chemical Group manufactures the SINOMER® Polythiol Series, delivering world-class alternatives to multinational benchmark grades, alongside bespoke customization services.
SINOMER® PM839 is a high-performance, unaccelerated polythiol polymer terminated with active mercapto (-SH) groups. It serves as an exact equivalent and drop-in alternative for Capcure 3-800, GABEPRO GPM-800, Polythiol QE-340M (Toray), and Thiocure 1200 (Bruno Bock).
Formulation Freedom: Free from pre-mixed accelerators, allowing formulators to fine-tune reaction kinetics by adjusting tertiary amine concentrations (e.g., DMP-30 from 5% to 10%) to achieve gel times from 2 minutes to several hours.
Rapid Hardness Development: Formulated with standard liquid Bisphenol-A epoxy (E51/BER-128), it achieves a Shore D hardness of 75 at -5°C within 24 hours (Shore D 84 at 27°C).
Primary Applications: Photovoltaic (PV) silicon wafer slicing adhesives, jewelry craft bonding, optical adhesives, electronic encapsulants, and anti-corrosive coatings.
SINOMER® PM840 PA is an advanced pre-accelerated polymercaptan curing agent containing a built-in amine catalytic package, engineered as a direct replacement for GABEPRO GPM-888.
Ready-to-Use 1:1 System: Mixes 1:1 by weight with standard Bisphenol-A epoxy resin (EEW ~190) to deliver a 5–8 minute gel time at 25°C and rapid strength buildup even at -5°C (Lap shear strength ≥ 18 MPa at 24h).
Thin-Film & Cold Curing: Eliminates surface tack and cures reliably in thin bond lines where standard aliphatic amines fail.
Primary Applications: 5-minute consumer DIY repair dual-syringe adhesives, automotive rapid assembly, electronic component tacking, and winter road repair kits.
For applications where a 5-minute pot life is too short for large-area spreading or precision robotic positioning, SINOMER® PM841 M provides an optimal 25–30 minute working window, serving as an equivalent to GABEPRO GPM-830CB.
Extended Open Time & High Strength: Delivers a cured tensile strength of 53 MPa, compressive strength of 64 MPa, lap shear strength of 22.8 MPa, and a Tg of 42°C.
Primary Applications: Civil engineering repair, industrial lamination, composite fabrication, large electronic component potting, and winter construction adhesives.
| Parameter | SINOMER® PM839 | SINOMER® PM840 PA | SINOMER® PM841 M |
|---|---|---|---|
| Product Nature | Pure Polymercaptan (Base) | Pre-accelerated Polythiol | Modified Extended Polythiol |
| International Benchmark Equivalents | Capcure® 3-800 GABEPRO® GPM-800 Polythiol QE-340M Thiocure® 1200 | GABEPRO® GPM-888 | GABEPRO® GPM-830CB |
| Appearance | Colorless transparent liquid | Light yellow transparent liquid | Light yellow transparent liquid |
| Viscosity @ 25°C (mPa·s) | 12,000 – 14,000 | 10,000 – 15,000 | 10,000 – 15,000 |
| Mercaptan Value (meq/g) | ≥3.0 | ≥3.0 | ≥3.0 |
| Typical Gel Time | Adjustable via accelerator | 5 – 8 minutes (25°) | 25 – 30 minutes (30°C) |
| Mix Ratio (with E51 Resin) | 100:100 (plus 5-10% DMP-30) | 100:80–120 (Typically 1:1) | 1:1 (by weight) |
| Low-Temp Curing Capability | Down to -5°C | Down to -5°C | Excellent at ambient / cold |
Every industrial production line has unique operational constraints. Off-the-shelf curing agents do not always match automated robotic dispensing speeds, cycle times, or thermal limits. Sinocure Chemical Group provides custom polymercaptan compounding and modification services:
Targeted Gel Time Engineering: Precise curing profiles customized between 2 minutes and 2 hours.
Rheological & Viscosity Customization: Formulations adjusted from thin capillary wetting (3,000 mPa·s) to non-sag thixotropic pastes.
Odor Reduction & Low-VOC Technologies: Proprietary synthesis routes yielding ultra-low residual odor for sensitive indoor and consumer electronics packaging.
Thermal & Mechanical Enhancements: Tailored modifications to elevate Tg, improve peel strength on metals/plastics, or enhance optical transparency.
A: Yes. SINOMER® PM839 possesses the same polymer structure and functional SH concentration (≥3.0 meq/g) as Capcure® 3-800, GPM-800, QE-340M, and Thiocure® 1200, allowing 1:1 substitution in adhesive formulations without altering base resin components.
A: SINOMER® PM840 PA is a pre-accelerated polythiol system that delivers a 5–8 minute gel time at 25°C with standard liquid Bisphenol-A epoxy resin (1:1 mix ratio), serving as an exact alternative for GPM-888 in fast consumer syringes and industrial assembly.
A: All products are supplied in standard 25 kg/drum for agile production and 220 kg/drum for high-volume automated industrial lines. Custom sample bottles are available for lab evaluations.
Looking for reliable low-temperature rapid curing or a custom polythiol hardener? Contact Sinocure Chemical Group's technical team today.
Sample & Formulation Requests: Request TDS & Free Sample
Direct Email: info@sinocurechem.com
Technical Support / WhatsApp: +86 156 6833 0235
