| Category | Polymer , Thermoset , Rubber or Thermoset Elastomer (TSE) |
| Manufacturer | SYNTHOS Kralupy a.s. |
| Trade Name | Kralex® |
| Port | Shanghai port,China |
| Trade Terms | FOB, CFR, CIF |
| Payment Terms | L/C, T/T, Western Union |
| Download PDF | SYNTHOS Kralex® 1721 Styrene Butadiene Rubber.pdf |
| Price | EMAIL US sales@lookpolymers.com |
| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Volatiles | <= 0.75 % | <= 0.75 % | ASTM D5668 |
| Mooney Viscosity | 42 - 52 @Temperature 100 °C |
42 - 52 @Temperature 212 °F |
(15-1.5 min); ASTM D3346 |
| 50 - 60 @Temperature 100 °C |
50 - 60 @Temperature 212 °F |
(1+4); ASTM D1646 | |
| Ash | <= 0.40 % | <= 0.40 % | ASTM D5667 |
| Mechanical Properties | Metric | English | Comments |
|---|---|---|---|
| Tensile Strength, Ultimate | 18.5 MPa | 2680 psi | 35'/145°C; ASTM D412 |
| Elongation at Break | 370 % | 370 % | 35'/145°C; ASTM D412 |
| 300% Modulus | 0.0120 - 0.0180 GPa | 1.74 - 2.61 ksi | 35'/145°C; ASTM D412 |
| Chemical Properties | Metric | English | Comments |
|---|---|---|---|
| Acid Value | 4.1 - 5.7 | 4.1 - 5.7 | ASTM D5774 |
| Styrene Content | 40 % | 40 % | ASTM D5775 |
| Descriptive Properties | Value | Comments |
|---|---|---|
| 50% of Vulcanization t' 50 (min.) | 6-10 | ASTM D5289 |
| Antioxidant Grade | Staining | |
| Compound Safety ts 1 (min.) | 2.7-5.3 | ASTM D5289 |
| Ethanol-toluene Extract (%) | 29-35 | ASTM D5774 |
| Extender Oil Content (%) | 27 | |
| Extender Oil Grade | DAE | |
| Maximal Moment (dNm) | 14.5-18 | ASTM D5289 |
| Minimal Moment (dNm) | 1.8-2.4 | ASTM D5289 |
| Optimal Vulcanization t' 90 (min.) | 11-16 | ASTM D5289 |
| Soaps content (%) | <= 0.3 |