SINOMER® PM840-M20 is a modified polymercaptan curing agent. When mixed with epoxy resins (such as BER-128/E51) at a 1:1 ratio, it achieves rapid gelation and curing even at low temperatures and in thin films. It demonstrates significant advantages in rapid repair, winter construction, and low-temperature operations. This grade is specifically designed to cure standard epoxy resins within approximately 20 minutes, providing a balanced working time and fast curing speed.
SINOMER® PM840-M20
(Modified Polymercaptan Epoxy Curing Agent - Fast Curing, approx. 16-20 mins Gel Time)
SINOMER® PM840-M20 is a modified polymercaptan curing agent. When mixed with epoxy resins (such as BER-128/E51) at a 1:1 ratio, it achieves rapid gelation and curing even at low temperatures and in thin films. It demonstrates significant advantages in rapid repair, winter construction, and low-temperature operations. This grade is specifically designed to cure standard epoxy resins within approximately 20 minutes, providing a balanced working time and fast curing speed.
Appearance | Colorless transparent liquid. |
Mercapto equivalent weight,meq/g | ≥3.0 |
Platinum-cobalt scale,Hazen | ≤30 |
Viscosity at 25℃,mPa.s | 10000-15000 |
Fast Curing & Thin-Film Curing: Excellent curing performance even in thin layers.
Light Color & High Transparency: Cured products exhibit a light color and high clarity.
Low Odor: Improved working environment compared to traditional amine curing agents.
SINOMER® PM840-M20 is widely used as an important rapid epoxy curing agent for rapid bonding, laminating, and casting. It is widely applied in various industries, including:
Handicrafts and jewelry
Electronics and electrical appliances
Civil construction
Composite materials
Photovoltaic (PV) new energy
Mix ratio: 1:1 with standard Bisphenol A epoxy resin (EEW ~195) is recommended as a starting point. Optimize based on specific epoxy grade and performance requirements.
Gel time at 30°C: 20 minutes time (average of 5 tests).
Pot life: short. Plan application accordingly.
Apply within pot life. For thin film applications, ensure even coating.
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
