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| Shield Material | |
| Rubber Sponge | |
| Soft Polyurethane Foam | |
| Graphic Sheet | |
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Saturday, September 23, 2023 |
Material
Rubber Sponge
Rubber Sponge after different pressing and shaping process, are used in audio speaker, office appliances, OA, car and other industrial products.
Rubber quality form
| Test menu / material | Hardness | Rubber material Specific gravity | Strength | Stretch | Heat resistant | Cold resistant |
| Natural rubber (NR) | 30 - 90 | 0.91 - 0.93 | 30 - 300 | 100 - 850 | 70 | -50 ~ -70 |
| Styrene Butadiene Rubber (SBR) | 40 - 95 | 0.93 - 0.94 | 50 - 200 | 100 - 600 | 100 | -30 ~ -60 |
| Buty1 rubber (UR) | 40 - 90 | 0.91 - 0.93 | 50 - 150 | 100 - 900 | 100 | -30 ~ -55 |
| Athylen propylene rubber (EPDM) | 60 - 80 | 0.86 - 0.87 | 50 - 200 | 100 - 600 | 120 | -40 ~ -60 |
| Chloroprene rubber (CR) | 40 - 95 | 1.15 - 1.25 | 50 - 250 | 100 - 900 | 100 | -35 ~ -55 |
| Nitril rubber (NBR) | 40 - 95 | 1 - 1.20 | 50 - 250 | 100 - 700 | 100 | -10 ~ -20 |
| Silicon rubber (SI) | 10 - 80 | 0.95 - 0.98 | 40 - 100 | 50 - 500 | 200 | -70 ~ -120 |
| Urethan (U) | 60 - 100 | 1.23 | 160 | 750 | 70 | -300 ~ -60 |
Sponge quality form
| Test menu / material | Hardness C type | Specific gravity | Pulling strength | Stretch | Tear strength | 25% Compression | Reference |
| C25 (CR) | 25 | 0.25 | 15.5 | 160 | 3.2 | 0.77 | UL-94HBF |
| C19 (CR) | 22 | 0.20 | 7 | 150 | 0.63 | UL-94HBF | |
| C24 (CR) | 34 | 0.24 | 12 | 170 | 2.8 | 0.90 | Hard type |
| C27 (CR) | 15 | 0.19 | 9.3 | 210 | 2.5 | 0.44 | Soft type |
| C15 (CR) | 8 | 0.15 | 7.1 | 410 | 3.1 | 0.28 | Very soft type |
| C22 (CR) | 35 | 0.27 | 13.9 | 110 | 1.03 | Non movetype | |
| N19 (NB) | 20 | 0.18 | 5 | 150 | 0.40 | ||
| NB23 (NBR) | 22 | 6.8 | 210 | 0.71 | Stand oily type | ||
| E20 (EPT) | 22 | 0.30 | 12. | 360 | 0.4 | Stand ozone type | |
| N09 (compose) | 5 | 0.10 | 3.2 | 220 | 0.23 |