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FreChem FKM fluoroelastomer gum raw rubber
TDS of FreChem Viton raw gum copolymer

| FreChem FKM raw gum Copolymer | ||||||
| Technical indexes | ||||||
| Items | C20 | C30 | C40 | C50 | C70 | C120 |
| Appearance | White or light-yellow sheet, no visible impurities | |||||
| Density (g/cm3) 23 °C | 1.82+0.02 | 1.82+0.02 | 1.82+0.02 | 1.82+0.02 | 1.82+0.02 | 1.82+0.02 |
| Mooney viscosity(ML(1+10)121°C) | 25+5 | 35+5 | 45+5 | 45+5 | 75+5 | 120-140 |
| Tensile strength after press cure(MPa) 1770C,10min≥ | 8 | 8 | 9 | 9 | 9 | 9 |
| Tensile strength after post cure(Mpa) 2300C,24H≥ | 10 | 10 | 11 | 13 | 11 | 12 |
| Elongation at break after press cure ( Mpa) 1770C,10min≥ | 180 | 180 | 180 | 180 | 180 | 180 |
| Elongation at break after post cure ( Mpa) 2300C,24H≥ | 160 | 160 | 160 | 160 | 160 | 160 |
| 200°C 70H Compressibility20% Compression set (%)≤ | 20 | 20 | 20 | 20 | 20 | 12 |
| 200℃,in No.3 jet fuel, weight increase after 24H (%)≤ | 5 | 5 | 5 | 5 | 5 | 5 |
| Water content (%)≤ | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.1 |
| Rubber compounds recipe: | FKM: 100g | AF: 2.0g | BBP:0.5g | MgO:3.0g | Ca(OH)2:6.0g | N990:30g |
Press Cure 177℃@10min;;Post Cure 230℃@24hour
Rubber compounds recipe:FKM:100;AF:2.0;BPP:0.5;MgO:3.0;Ca(OH)2:6.0;N990:30.0
| FKM | Fluoroelastomer | FKM material | Fluorous rubber | Fluorine carbon rubber |
| Viton | Fluororubber | FPM | viton raw gum | FKM elastomer |
Other name
TDS of FreChem Fluoroelastomer raw gum Terpolymer

| FreChem FKM raw gum Terpolymer | ||||||
| Technical indexes | ||||||
| Items | T20 | T30 | T40 | T70 | T100 | |
| Appearance | White or light-yellow sheet, no visible impurities | |||||
| Density (g/cm3)23 °C | 1.84-1.88 | 1.84-1.88 | 1.84-1.88 | 1.84-1.88 | 1.84-1.88 | |
| Mooney viscosity(ML(1+10)121°C) | 20-30 | 30-40 | 40-50 | 60-90 | 90-120 | |
| Tensile strength after press cure(MPa) 1770C,10min≥ | 9 | 9 | 9 | 9 | 10 | |
| Tensile strength after post cure(Mpa)2300C,24H≥ | 10 | 11 | 11 | 11 | 12 | |
| Elongation at break after press cure ( Mpa) 1770C,10min≥ | 180 | 180 | 180 | 180 | 180 | |
| Elongation at break after post cure ( Mpa) 2300C,24H≥ | 160 | 160 | 160 | 160 | 160 | |
| 200°C 70H Compressibility20% Compression set (%)≤ | 30 | 30 | 30 | 30 | 30 | |
| Oil resistivity | 180℃×24h 4109 bisphenol oil resistivity (%)≤ | 6 | 6 | 6 | 6 | 6 |
| (200℃×24h) RP-3 oil resistivity (%) ≤ | 7 | 7 | 7 | 7 | 7 | |
| Water content (%)≤ | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | |
| Rubber compounds recipe: | FKM: 100g | AF: 2.0g | BBP:0.5g | MgO:3.0g | Ca(OH)2:6.0g | N990:30g |
| Technical date sheet,Press Cure 177℃@10min;Post Cure 230℃@24hour | ||||||
| FKM | fluoroelastomer | FKM material |
| Viton | fluororubber | viton raw gum |
Other name
TDS of FreChem Fluoroelastomer viton pre compound
| FreChem Selection Guide of FreChem FKM precompound | |||||||||||||
| vulcanizing system | Grade Name | Fluorine Content% | Special Gravity g/cm3 | Mooney Viscosity | Processing method | Recipe | Hardness | Tensile Strength | Elongation at break | Compression Set | TR10 | ||
| ML | Molding | injection | (Shore A) | (MPa) | (%) | 200℃×70H(%) | (℃) | ||||||
| (1+10;21℃) | |||||||||||||
| Copolymer | Bisphenol system | FR2501 | 66 | 1.81 | 45 | √ | 1 | 70 | 15 | 240 | 19 | -17 | |
| FR2361 | 66 | 1.81 | 35 | √ | 2 | 75 | 14 | 280 | 20 | -17 | |||
| FR2401 | 66 | 1.81 | 40 | √ | 1 | 78 | 15 | 200 | 19 | -17 | |||
| FR2601 | 66 | 1.81 | 60 | √ | 1 | 77 | 15 | 220 | 18 | -17 | |||
| FR2961 | 66 | 1.81 | 85 | √ | 2 | 76 | 15 | 270 | 18 | -17 | |||
| FR2408S | 66 | 1.81 | 45 | √ | 1 | 77 | 14 | 210 | 21 | -17 | |||
| FR2901 | 66 | 1.81 | 90 | √ | 2 | 77 | 16 | 200 | 16 | -17 | |||
| FR2201 | 66 | 1.81 | 25 | √ | √ | 1 | 77 | 13 | 230 | 20 | -17 | ||
| Terpolymer | Bisphenol system | FR3301 | 68 | 1.81 | 35 | √ | 1 | 76 | 14 | 230 | 17 | -17 | |
| FR3562 | 68 | 1.81 | 50 | √ | 2 | 75 | 14 | 280 | 20 | -15 | |||
| FR3562 | 68 | 1.81 | 50 | √ | 2 | 75 | 14 | 280 | 20 | -15 | |||
| NF3501 | 68 | 1.81 | 50 | √ | 1 | 77 | 15 | 210 | 19 | -15 | |||
| FR3761 | 68 | 1.81 | 70 | √ | 2 | 75 | 14 | 280 | 20 | -15 | |||
| FR3401 | 65.5 | 1.81 | 40 | √ | 1 | 75 | 14 | 210 | 24 | -19 | |||
| FR3501G | 69.7 | 48 | √ | 1 | 77 | 14 | 210 | 31 | -7 | ||||
| Peroxide curable FKM | Peroxide system | FR500GF | 70 | 1.9 | 50 | √ | 4 | 72 | 21 | 230 | 20 | -7 | |
| FR200GE | 70 | 1.9 | 25 | √ | 4 | 74 | 22 | 205 | 20 | -7 | |||
| FR4357PLT | 66 | 1.81 | 50 | √ | 4 | 72 | 21 | 190 | 20 | -24 | |||
| NF4357PFLT | 64 | 1.81 | 50 | √ | 4 | 69 | 20 | 240 | 23 | -30 | |||
| Technical date sheet,Curing condition 175℃@ 6min arc 0.5;Press Cure 177℃@10min;Post Cure 230℃@24hour | |||||||||||||
| Recipe1 precompound:100g;MgO:3g;NICC5000:6g;N990:30g | |||||||||||||
| Recipe2 precompound:100g;MgO:6g;NICC5000:3g;N990:30g;PTFE:2g | |||||||||||||
| Recipe3 precompound:100g;MgO:3g;NICC5000:3g;N990:30g | |||||||||||||
| Recipe4 precompound:100g;N990:30g;DBPH-50S:3g;TAIC70%:4g;ZnO:5g | |||||||||||||
Jiangsu FreChem Co., Ltd

FreChem is a professional research & development,
manufacturer of high performance rubber compounds, special additives and fluorochemicals.
Starting from 2007, FreChem has now become one of the leading manufacturers of rubber compounds in China.
Thanks to our research & development capabilities, FreChem is able to provide highly qualified rubber compounds to global customers: Fluoroelastomer(FKM), Fluorosilicones(FVMQ),HNBR compounds, NBR compounds, EP compounds, SBR compounds and so on.
FreChem expects to offer best solution as well as customization in order to meet customers’ special needs. The equipment and special know- how used in production control guarantee that our compounds respond to the customer requirement and provide high consistency standards.
Our vision is to become an excellent partners with customers and we will improve and focalize our skill on final application to develop compounds with high added value.
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