SINOMER®PM839 is a transparent liquid polymer curing agent with thiol (-SH) termination. Excellent properties when combined with amines or polyamines to cure epoxy resins. Provides fast cure rates at low temperatures and in thin films.
SINOMER® PM839
(Polymercaptan low temperature epoxy curing agent)
CAS No.: 72244-98-5;101359-87-9
Chemical Name: 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
Synonyms: Capcure 3-800;GABEPRO GPM-800;Polythiol QE-340M;Thiocure 1200;Polythiol;Polymercaptan
Molecular structure：
Appearance | Colorless transparent liquid. |
Mercapto equivalent weight,meq/g | ≥3.0 |
Platinum-cobalt scale,Hazen | ≤20 |
Viscosity at 25℃,mPa.s | 12000-14000 |
Total chlorine content,ppm | ≤800 |
pH Value ,1% Water solution | 5.00-7.00 |
Volatile matter,%(m/m) | ≤1.2 |
High viscosity, low chrominance, and low odor
Good transparency after curing
Epoxy resin low-temperature rapid curing agent
PV silicon wafer processing
Bonding agent for jewelry and craftwork
Electronic adhesives
Anticorrosive coating
Can be combined with Sinepoxy® BER-128 (thiol curing agent) and Sinepoxy®DMP-30 (accelerator) to form a low-temperature fast epoxy curing system.
Test Formulation: E51/BER-128 : PM839 : DMP-30 = 100 g : 100 g : 10 g
Property | Condition | Result |
Gel Time | –5°C | 3 min 20 s |
27°C, 70% RH | 2 min 40 s | |
Hardness (Shore D), 24h | –5°C | 75 |
27°C, 70% RH | 84 | |
Lap Shear Strength (MPa), 24h | –5°C | 9 |
27°C, 70% RH | 19 |
Notes:
Hardness sample size: φ35 mm × 6 mm
Lap shear substrate: steel, 25 mm × 100 mm × 1.6 mm
SINOMER® PM839 cures rapidly even at low temperatures and develops high hardness. Data shown for –5°C and 27°C / 70% RH.
Formulation A: E51/BER-128 : PM839 : DMP-30 = 100 : 100 : 5
Formulation B: E51/BER-128 : PM839 : DMP-30 = 100 : 100 : 10
Time | Formulation A | Formulation B | ||
–5°C | 27°C, 70% RH | –5°C | 27°C, 70% RH | |
0.5 h | 66 | 73 | 68 | 78 |
1 h | 67 | 75 | 70 | 82 |
3 h | 65 | 76 | 75 | 82 |
24 h | 70 | 78 | 75 | 84 |
3 d | 68 | 79 | 74 | 82 |
*Note:
DMP-30 is 2,4,6-Tris(dimethylaminomethyl)phenol.
Hardness sample size: φ35 mm × 6 mm.*
Figure 1.
Hardness development of E51(BER-128) / PM839 / DMP-30 at –5°C and 27°C / 70% RH
(Left: 100:100:5; Right: 100:100:10)
SINOMER® PM839 develops high lap shear strength quickly, even at low temperatures.
Formulation A: E51/BER-128 : PM839 : DMP-30 = 100 : 100 : 5
Formulation B: E51/BER-128 : PM839 : DMP-30 = 100 : 100 : 10
Time | Formulation A | Formulation B | ||
–5°C | 27°C, 70% RH | –5°C | 27°C, 70% RH | |
0.5 h | 4 MPa | 7 MPa | 6 MPa | 12 MPa |
1 h | 5 MPa | 8 MPa | 9 MPa | 16 MPa |
3 h | 6 MPa | 10 MPa | 7 MPa | 18 MPa |
24 h | 11 MPa | 18 MPa | 9 MPa | 19 MPa |
3 d | 12 MPa | 20 MPa | 9 MPa | 17 MPa |
Note: Substrate for lap shear: steel, 25 mm × 100 mm × 1.6 mm.
Figure 2.
Lap shear strength development of E51(BER-128) / PM839 / DMP-30 at –5°C and 27°C / 70% RH
(Left: 100:100:5; Right: 100:100:10)
The information contained herein is based on our current knowledge and internal testing. It is provided for reference purposes only. We make no warranties, express or implied, regarding the accuracy, completeness, or timeliness of this data. Any decisions made based on this information are solely the responsibility of the user.
25kg/drum or 220 kg/drum
Being kept in dry, clean warehouse with well ventilation.
Avoid exposing to light and heating.
Protecting the product from leakage, rain and insolation during transportation.
| 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 | ||||
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