SINOMER® PM840-M5 is a pre-accelerated polymercaptan epoxy curing agent containing a built-in amine catalyst system. It is designed for fast curing of epoxy resins at ambient and low temperatures, even in thin film applications. The product is supplied as a clear, ready-to-use liquid and does not require additional catalyst addition, simplifying formulation and ensuring consistent curing performance.
This product serves as an effective alternative to CAPCURE 3830-81,CAPCURE 3850-101,GABEPRO GPM-888,GABEPRO GPM-891, offering comparable curing speed and reliability. It is ideally suited for applications requiring rapid strength development, excellent adhesion to various substrates, and reliable performance under challenging conditions.
SINOMER® PM840-M5
(Pre-Accelerated Polymercaptan Epoxy Curing Agent)
5-Minute Fast-Cure at Low Temperature & Thin Film | Ready-to-Use | Alternative to GABEPRO GPM-888
SINOMER® PM840-M5 is a pre-accelerated polymercaptan epoxy curing agent containing a built-in amine catalyst system. It is designed for fast curing of epoxy resins at ambient and low temperatures, even in thin film applications. The product is supplied as a clear, ready-to-use liquid and does not require additional catalyst addition, simplifying formulation and ensuring consistent curing performance.
This product serves as an effective alternative to Huntsman GABEPRO GPM-888, offering comparable curing speed and reliability. It is ideally suited for applications requiring rapid strength development, excellent adhesion to various substrates, and reliable performance under challenging conditions.
Appearance | Light yellow transparent liquid |
Mercapto equivalent weight (meq/g) | ≥ 3.0 |
Total chlorine content (ppm) | ≤ 800 |
Viscosity @ 25°C (mPa·s) | 10,000 – 15,000 |
pH value (1% water solution) | 9.0 – 10.0 |
Pre-accelerated formulation-Ready to use; no need for external catalysts
Rapid cure – Fast strength development at room temperature and low temperatures (down to -5°C)
Thin film cure – Effective even in thin bond lines where conventional amines may fail
Low temperature performance – Cures reliably in cold environments
Excellent adhesion – Bonds well to metals, glass, ceramics, and plastics
Low viscosity – Good wetting and penetration into substrates
Low color – Suitable for applications where appearance is important
Direct replacement – Compatible with existing GPM-888 formulations with minimal adjustments
Epoxy resin low-temperature rapid curing systems
Structural adhesives for automotive and industrial assembly
Jewelry and craft bonding
Electronic adhesives and encapsulation
Anti-corrosion coatings and floorings
Repair compounds and patching kits
Road marking adhesives
Typical formulation (starting point):
Component | Parts by weight |
Epoxy resin (EEW ~190, e.g., Bisphenol A type) | 100 |
SINOMER® PM840-M5 | 80 – 120 |
The recommended mix ratio should be optimized based on the specific epoxy resin grade, desired gel time, and final performance requirements. For most standard Bisphenol A epoxy resins, a 1:1 ratio (epoxy : hardener) by weight is a good starting point.
Gel time at 25°C is typically 5 8 minutes depending on the epoxy resin used.
Based on testing with standard Bisphenol A epoxy resin (EEW ~190) at a 1:1 mix ratio:
Condition | Gel Time | Lap Shear Strength (24h) |
25°C, 70% RH | ~2-8 min | ≥ 18 MPa |
-5°C | ~20-30 min | ≥ 10 MPa |
Notes:
Performance may vary depending on epoxy resin type, formulation, and test condit
Mixing: Stir the resin and hardener thoroughly until homogeneous. Use mechanical mixing for best results.
Pot life: Short pot life (5‑10 minutes at 25°C). Plan application accordingly.
Application: Apply within the pot life. For thin film applications, ensure even coating.
Cure: Allow to cure at ambient temperature. Low temperatures will prolong curing time.
| SINOMER® Polythiol & Mercaptan Curing Agents — Cross-Reference & Selection Guide | ||||
| Sinocure Chemical Group | Low-Temperature, Rapid Curing & Optical Monomers | www.sinocurechem.com | ||||
| SINOMER® Grade | Chemical Class / CAS No. | Typical Gel / Cure Time | Product Profile & Application Systems | International Benchmark Equivalents |
| SINOMER® PM839 | Polymercaptan Base Resin CAS: Proprietary Polymer | Adjustable (2 – 60 min) Controlled via accelerator | Unaccelerated base polymercaptan. Offers formulators total freedom to adjust cure kinetics and pot life with tertiary amines (e.g. DMP-30). Ideal for PV slicing, electronics, and coatings. | • Capcure® 3-800 (Gabriel / Huntsman) • GABEPRO® GPM-800 • Polythiol QE-340M (Toray) • Thiocure® 1200 (Bruno Bock) |
| SINOMER® PM839-S40 | Modified Polythiol CAS: Polymer System | Approx. 40 Seconds (@ 25°C, 20g mass) | Ultra-fast curing polythiol system. Delivers instant gelation and rapid bond strength development for emergency repairs, fast patch kits, and high-speed automated positioning. | • CAPCURE® 40 SEC HV • GABEPRO® GPM-890CB • GABEPRO® GPM-895FC |
| SINOMER® PM840-M5 (PM840 PA) | Pre-Accelerated Polythiol CAS: Polymer System | 5 – 8 Minutes (@ 25°C, 1:1 with E51) | Ready-to-use 1:1 fast-curing polymercaptan hardener with built-in catalyst. Direct drop-in for dual-syringe consumer DIY adhesives, electronics tacking, and cold-weather road repair. | • GABEPRO® GPM-888 • GABEPRO® GPM-891 • CAPCURE® 3830-81 • CAPCURE® 3850-101 |
| SINOMER® PM840-M10 | Modified Polythiol CAS: Polymer System | Approx. 10 Minutes (@ 30°C, 1:1 with E51) | Modified fast polythiol curing agent with balanced 10-minute working time. Features high optical clarity and low residual odor for jewelry, crafts, and precision electronics. | • 10-Minute Fast-Cure Polythiol Series • Standard 10-Min Fast Epoxy Hardeners |
| SINOMER® PM840-M15 | Modified Polythiol CAS: Polymer System | 13 – 15 Minutes (@ 25°C, 1:1 with E51) | Modified polythiol providing extended 13-15 minute pot life. Ideal for precision manual component alignment, multi-pin potting, and electronic encapsulation. | • 15-Minute Fast-Cure Polythiol Series |
| SINOMER® PM840-M20 | Modified Polythiol CAS: Polymer System | 16 – 20 Minutes (@ 25°C, 1:1 with E51) | Balanced medium-fast polythiol curing agent. Extended working life designed for composite lamination, civil engineering repairs, and sub-zero winter construction. | • 20-Minute Fast-Cure Polythiol Series |
| SINOMER® PM841-M30 (PM841 M) | Modified Polythiol CAS: Polymer System | 25 – 30 Minutes (@ 30°C, 1:1 with E51) | Modified polythiol curing agent with 25-30 min open time and high mechanical performance (Tensile 53 MPa, Tg 42°C). Excellent for structural bonding and casting. | • GABEPRO® GPM-830CB |
| SINOMER® TMPMP | Trifunctional Thiol Monomer CAS: 33007-83-9 | Rapid Crosslinking (Formulation dependent) | Trimethylolpropane Tris(3-mercaptopropionate). Low-viscosity trifunctional liquid crosslinker for epoxies, polyurethanes, radiation-curable coatings, and PCB solder masks. | • Thiocure® TMPMP (Bruno Bock) • TMPMP (Evans Chemetics) |
| SINOMER® PETMP | Tetrafunctional Thiol Monomer CAS: 7575-23-7 | Rapid High Crosslinking (Formulation dependent) | Pentaerythritol Tetrakis(3-mercaptopropionate). High-density tetrafunctional crosslinker for low-temperature epoxy curing, high-index optical resins, UV nail gels, and elastomers. | • Thiocure® PETMP (Bruno Bock) • PETMP (Evans Chemetics) • MR-7™ Optical Thiol Component |
| SINOMER® BMPT | Optical Polythiol Monomer CAS: 131538-00-6 | Rapid Optical Reaction (Formulation dependent) | 2,3-bis((2-mercaptoethyl)thio)-1-propanethiol. High refractive index (nD = 1.63) trifunctional monomer for 1.60/1.67 optical lenses, UV optical glues, and specialty epoxy modifiers. | • THIOCURE® DMPT (Bruno Bock) • MR-8™ Optical Thiol Component |
| * Custom Polythiol Synthesis: Sinocure Chemical Group offers tailored polymercaptan formulation services with customized gel times (2 min to 2 hours), tailored viscosities, and low-odor profiles. Contact: info@sinocurechem.com | www.sinocurechem.com | ||||
We offer a variety of options to help you find the right product for your application
Provide formulation optimization support for water-based/solvent-based systems
Full coverage of REACH, FDA, and GB standards
99.8% on-time delivery rate, 10,000-ton production capacity guarantee
