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
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.
| 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 | 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 |
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