Natural rubber (NR) is the most elastic general-purpose elastomer we mold. It has the highest tensile and tear strength of the common rubbers, damps shock, vibration and torsional oscillation better than NBR, SBR or PU, and bonds strongly to metal inserts - which is why it is our first choice for shear-loaded blocks, rubber rings and pin-and-bush sleeves. Its limit is resistance to oil, ozone and weathering: for oily duty choose NBR, for outdoor or hot-water service choose EPDM.
| Temperature range | -50 °C to +90 °C (short peaks to +100 °C) |
| Hardness | 40–90 Shore A |
| Tensile & tear strength | Highest of the general-purpose rubbers |
| Shock & vibration damping | Excellent |
| Oil & fuel resistance | Poor - specify NBR instead |
| Weather & ozone resistance | Poor - specify EPDM instead |
Properties are typical for the grades we use; we adjust hardness and compound for your duty.
H-profile shear blocks, sizes H80 – H610 with A/B variants, molded to full dimension drawings.
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Precision rubber rings and elastic sleeves for FCL pin-and-bush couplings, FCL #1 – #8, with matching bolt sets available.
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Curved-lobe grid elastomer, sizes GR14 – GR125, for flexible grid couplings with high torque capacity.
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Toothed gear-type elastomer in J profile, sizes 3J – 14J, for flexible gear coupling elements up to 333 mm OD.
View seriesEverything buyers ask before ordering coupling elastomers from our Shanghai factory.
NR (natural rubber) is the most elastic general-purpose rubber: it has the highest tensile and tear strength of the common compounds and damps shock and vibration better than NBR, SBR or PU. Choose NR for shear elements, rubber rings and pin-and-bush sleeves on drives with heavy shock, torsional vibration or alternating load. Where the element touches oil or grease, specify NBR instead; for outdoor, ozone or hot-water duty, specify EPDM.
We mold NR into H-block shear elements, FCL rubber rings and pin-and-bush sleeves, GR grid coupling elastomers and J-profile gear coupling sleeves. Hardness from 40 to 90 Shore A; compound and hardness are adjusted to your torque, speed and ambient conditions.
Typical NR compounds work from about -50 °C to +90 °C, with short excursions to +100 °C. Natural rubber also ages faster than EPDM under ozone, UV and hot air, so for continuous outdoor or hot-water service we recommend EPDM.
Send us your coupling model, drawing or sample — our engineers will confirm the correct element and quote within 24 hours.
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