SINOMER® PM840 PA 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.
SINOMER® PM840 PA
(Pre-Accelerated Polymercaptan Epoxy Curing Agent)
Fast Curing at Low Temperature & Thin Film | Ready-to-Use | Alternative to GABEPRO GPM-888
SINOMER® PM840 PA 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 PA | 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.
| Product Name | Cas No. | Chemical Name | Synonyms/Application |
| ▶Sinomer® PETMP | 7575-23-7 | Penta-erythritol tetrakis(3-mercaptopropionate) | THIOCURE PETMP; PET-3-MP;Tetra (3-mercaptopropionate) |
| ▶Sinomer® BMES | 3570-55-6 | Bis(2-mercaptoethyl) sulfide; Dimercapto diethyl sulfide; 2,2′-Thiodiethanethiol; | THIOCURE DMDS; Polythiol DMDS |
| ▶Sinomer® BMPT | 131538-00-6 | 2,3-bis((2-mercaptoethyl)thio)-1-propanethiol | THIOCURE DMPT; Polythiol DMPT |
| ▶Sinomer® PM839 | 72244-98-5;101359-87-9 | Poly[oxy(methyl-1,2-ethanediyl)],.alpha.-hydro-.omega.-hydroxy-, ether with 2,2-bis(hydroxymethyl)-1,3-propanediol (4:1), 2-hydroxy-3-mercaptopropyl ether | Epoxy curing agent,Capcure 3-800; GABEPRO GPM-800; Polythiol QE-340M; Thiocure 1200 |
| ▶Sinomer® TMPMP | 33007-83-9 | Trimethylolpropane Tris(3-mercaptopropionate) | / |
| ▶Sinomer®OM835 | 188829-97-2 | Bis(thiiran-2-ylmethyl)sulfane;1,1′-Thiobis(2,3-epithiopropane);Bis(2,3-ethylpropyl) sulfide | high refractive index optical monomer |
| ▶Sinomer® OM265 | 39667-72-6 | 2-Propenoic acid, 2-(2-benzothiazolylthio)ethyl ester;(2-(2-benzothiazolylthio)ethyl)acrylate;MBTA | high refractive index optical monomer |
| ▶Sinomer® OM258 | 97049-32-0 | 2-Naphthalenylthioethyl acrylate;2-Propenoic acid 2-(2-naphthalenylthio)ethyl ester;NTEA | high refractive index optical monomer |
| ▶Sinomer® OM386 | 129283-82-5 | Bis(4-Methacryloylthiophenyl) Sulfide;4,4'-Thiodibenzenedithiol Dimethacrylate | high refractive index optical monomer |
| ▶Sinomer® PETMA | 10193-99-4 | Penta-erythritol tetrakis(2-mercaptoacetate) | coupling agent |
| ▶Sinomer® EGDMP | 22504-50-3 | Ethylene Glycol Bis(3-Mercaptopropionate) | cross-linking agent,curing agent |
| ▶Sinomer® GDMA | 123-81-9 | Glycoldimercaptoacetete;Ethylene di(S-thioacetate) | PVC heat stabilizer |
| ▶Sinomer® EHMP | 50448-95-8 | 2-Ethylhexyl 3-Mercaptopropionate | Sulfur-tin stabilizer |
| ▶Sinomer® GMT80 | 30618-84-9 | Glyceryl monothioglycolate | daily chemical |
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
