🧩 CR – Chloroprene Rubber (Neoprene®)
(A universal synthetic elastomer known as Neoprene, featuring excellent resistance to weathering, moderate oils, ozone, and flames. It maintains elasticity over a wide temperature range from -40 °C to +120 °C.)
🔹 What is CR
CR is the ultimate general-purpose technical rubber. At ReplastMD, we treat it as a high-durability “universal” elastomer. The chlorine atoms in its molecular chain provide inherent resistance to fire and oxidation. Compared to NBR or EPDM, it offers a unique balance between flexibility and environmental resistance, making it the top choice for exterior automotive boots, gaskets, and electrical insulation.
🔧 Composition & Properties
- Polymer Base: Chloroprene polymer (CR).
- Density: ~ 1.23 – 1.35 g/cm³.
- Operating Range: -40 °C to +120 °C.
- Flammability: Inherently self-extinguishing.
- Visuals: Matte black or dark grey; dense and elastic texture.
🚗 Where it is used in the automotive industry
| Component | Example parts | Observations |
| Oil/Water/Air Gaskets | VW, Renault, Toyota | Ozone and moderate grease resistance |
| EGR Hoses & Sleeves | BMW, Ford | Thermal resistance and stable elasticity |
| CV Boots / Mounts | Dacia, Hyundai | Excellent shock absorption |
| Body Seals | Peugeot, Mercedes | UV and aging resistance |
🔧 Welding and Bonding Methods
| Method | Optimal Temp | Observations |
| Chemical Bonding | ✅ Recommended | Specialized rubber glue (Loctite® 406 + 770 primer) |
| Local Vulcanization | ✅ Ideal | Possible with CR paste or rubber patches |
| Hot Air | ✅ 110 – 140 °C | Surface activation for better bonding |
💡 ReplastMD Recommendation: Repair via bonding or local vulcanization at ~130 °C. CR is an excellent material for gaskets, bellows, and exterior hoses due to its ozone and vibration resistance, commonly found in protective and insulation parts.