BUNA Nitrile / EPDM / FKM/FPM Wafer / Lug Butterfly Valve Liners With High Hardness
BUNA(Nitrile) / EPDM / FKM/FPM wafer/ lug butterfly valve liners
Classification of rubber
There are many varieties of rubber, and the classification methods are not uniform.
1) According to the source of materials, it can be divided into two categories: Natural Rubber and Synthetic Rubber.
2) According to its performance and use, it can be divided into two categories: Universal Rubber and Specialty Rubber Eastomer.
* Any rubber with the same or close performance as natural rubber, good physical properties and processing properties, and can be widely used in tires and other general rubber products is called general rubber.
General rubber: natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (polybutadiene rubber, BR), isoprene rubber (polyisoprene rubber, IR)
* Any special rubber product with special properties, special for heat resistance, cold resistance, chemical corrosion resistance, oil resistance, solvent resistance, radiation resistance, etc. is called special rubber.
Special rubbers include: nitrile rubber (NBR), silicone rubber, fluoro rubber, urethane rubber, polysulfide rubber, polyacrylate rubber (UR), chloroether rubber, chlorinated polyethylene rubber (CPE), chlorosulfonated polyethylene (CSM), butadiene rubber, etc.
In fact, there is no strict boundary between general rubber and special rubber. For example, ethylene propylene rubber has the above two characteristics. Between general rubber and special rubber are: neoprene (CR), ethylene propylene rubber (EPDM), butyl rubber (IIR).
Common used materials quick selection:
| Summary table of rubber properties (Suzhou Meilong) | |||||||||||||
| Rubber Name | Natural rubber | Butadiene rubber | Butadiene styrene rubber | Butyl rubber | Ethylene propylene rubber | Ethylene-vinyl acetate copolymer | Neoprene | Chlorosulfonated polyethylene | Buna-N rubber | Polyurethane rubber | Silicone Rubber | Fluororubber | |
| Short Name | NR | BR | SBR | IIR | EPM EPDM |
EVA | CR | CSM | NBR | PU | SI | FPM | |
| Pure rubber performance | Proportion | 0.91~0.93 | 0.91~0.94 | 0.93~0.94 | 0.91~0.93 | 0.86~0.87 | 0.98~0.99 | 1.15~1.25 | 1.11~1.18 | 1.00~1.20 | 1.00~1.30 | 0.95~0.98 | 1.80~1.82 |
| Refractive index(ND) | 1.59 | 〜 | 5339~1.53 | .508~1.50 | 〜 | 〜 | 1.353~1.560 | 〜 | 1.521 | 〜 | 〜 | 〜 | |
| Solubility parameter(SP) | 7.9~8.1 | 8.4~8.6 | 8.4~8.6 | 7.7~8.06 | 7.9~8.0 | 〜 | 8.85 | 8.1~9.3 | 9.64 | 10 | 7.3 | 7.3 | |
| Mooney viscosity ML1+4,100℃ | 90~150 | 35~55 | 30~60 | 45~75 | 45~120 | 20~30 | 45~120 | 30~55 | 30~100 | 25~60 | 〜 | 65~180 | |
| Processability | A | A | A | C | B | A | A | B | A | C | B | C | |
| Vulcanized rubber mechanical properties | Hardness (Shore A) | 10~100 | 30~100 | 30~100 | 20~90 | 30~90 | 50~90 | 10~90 | 50~90 | 15~100 | 10~100 | 30~90 | 50~90 |
| Tear strength kg/cm2 | 30~300 | 20~200 | 50~200 | 50~150 | 50~200 | 70~200 | 50~250 | 70~200 | 50~250 | 200~450 | 40~100 | 70~200 | |
| Elongation % | 100~1000 |
100~ 800 |
100~ 800 |
100~ 800 |
100~ 800 |
100~ 600 |
100~ 1000 |
100~500 |
100~ 800 |
300~800 | 50~500 | 100~500 | |
| Elasticity | A | A | B | C | B | B | A | B | B | A | A | C | |
| Tear strength | A | B | C | B | C | B | B | B | B | A | C~D | B | |
| Compression set | A | B | B | C | B | B | A | B | A | A | A | B | |
| Wear resistance | A | A | A | B | B | B | A~B | A | A | A | C~D | A | |
| Flexural crack resistance | A | C | B | A | B | B | B | B | B | A | B~D | B | |
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.