FFKM O-Rings
Our FFKM O-rings are available in three compound grades:
- UThot™ KH Series（High-Temperature Resistant FFKM）
- UTchem™ KR Series（Chemical-Resistant FFKM）
- UTpure™ KS Series（Ultra-High-Purity FFKM）
These materials are engineered to deliver outstanding sealing performance in demanding industrial and semiconductor applications.
UTchem™ KR Series
| Typical Physical Properties | KR715 | KR720 | KR820 | KR225 | KR245 | KR920 |
| Hardness, shore A | 76 | 75 | 80 | 70 | 75 | 90 |
| Color | Black | White | Beige | White | Brown | White |
| 100% Modulus, Mpa | 7.22 | 9.77 | 17.51 | 5.04 | 4.94 | 16.76 |
| Tensile strength at Break, Mpa | 17.29 | 16.16 | 25.11 | 14.98 | 18.48 | 23.04 |
| Elongation at Break, % | 189 | 162 | 125 | 185 | 198 | 140 |
| Compression Set(%,70hr@200℃) | 22 | 25 | 31 | 24 | 19 | 35 |
| Max.Continuous Service Temp, ℃ | 240 | 230 | 230 | 230 | 230 | 230 |
| Equivalent to Kalrez/Chemraz/Other | 6375/550 | 513/G74S | 8085/592 | 513/G76W | 570/571 | 520 |
UThot™ KH Series
| Typical Physical Properties | KH215 | KH216 | KH212 | KH225 | KH122 | KH910 |
| Hardness, shore A | 75 | 75 | 75 | 75 | 65 | 90 |
| Color | Black | Black | Black | Beige | Beige | Black |
| 100% Modulus, Mpa | 7.22 | 6.97 | 10.53 | 6.14 | 5.63 | 16.58 |
| Tensile strength at Break, Mpa | 21.53 | 15.92 | 21.95 | 15.71 | 15.71 | 25.67 |
| Elongation at Break, % | 195 | 170 | 153 | 198 | 212 | 156 |
| Compression Set(%,70hr@200℃) | 16 | 20 | 11 | 20 | 23 | 22 |
| Max.Continuous Service Temp, ℃ | 300 | 315 | 325 | 300 | 300 | 300 |
| Equivalent to Kalrez/Chemraz/Other | Du351 | 4079/Du353/XCD | 8900/Du551 | G75H/65S | 8475/8575/G70H | 0090/526 |
UTpure™ KS Series
| Typical Physical Properties | KS230 | KS732 | KS243 | KS130 | KS232 | KS730 |
| Hardness, shore A | 73 | 70 | 75 | 63 | 79 | 75 |
| Color | Amber | Dark Brown | Brown | Amber | Dark Brown | Beige |
| 100% Modulus, Mpa | 4.12 | 4.68 | 6.73 | 3.84 | 6.35 | 5.08 |
| Tensile strength at Break, Mpa | 16.43 | 15.18 | 21.05 | 15.28 | 16.12 | 16.57 |
| Elongation at Break, % | 224 | 222 | 181 | 307 | 231 | 233 |
| Compression Set(%,70hr@200℃) | 24 | 18 | 20 | 23 | 19 | 20 |
| Max.Continuous Service Temp, ℃ | 250 | 310 | 250 | 270 | 310 | 280 |
| Equivalent to Kalrez/Chemraz/Other | 9100/656 /8002 | 9100/XRZ | E38/XPE-HP | G100XT/ G67P | 9300/9500 | 9100/XRZ |