| Property | Value |
|---|---|
| Temperature range | -40 °C to +110 °C |
| Hardness | 40–90 Shore A |
| Flame resistance | Inherent, from the chlorine in the polymer |
| Contains fluorine | No |
The case for a material that wins nothing
Most elastomer selection assumes one dominant requirement. Real parts often have three moderate ones. A gasket that sees a little oil, a lot of weather, and has to meet a flammability requirement is badly served by nitrile, which fails outdoors, and by EPDM, which fails in the oil. Neoprene handles all three adequately, and adequately across the board is a better outcome than excellent in one dimension and failed in another.
That is where neoprene earns its place. If your part has one controlling requirement, a specialist material will beat neoprene on that requirement and often on price. If it has several, neoprene is frequently the material that gets specified after the specialists have each been ruled out.
Flame resistance comes from the polymer
The chlorine in chloroprene makes it self-extinguishing without flame-retardant additives. That matters because additive packages can be loaded heavily enough to compromise the mechanical properties of the compound, and because they can migrate over time. A neoprene part is flame-resistant because of what it is, which is a more durable claim than a part that is flame-resistant because of what was added to it. Transit, mass-transit, and mining applications specify it for exactly this reason.
It bonds well, and that is underrated
Neoprene has a long history in rubber-to-metal bonded assemblies and adhesive systems for it are mature and well understood. For mounts, bearings, and coated metal, where the bond is the thing that fails first, a family with predictable bonding behaviour is worth real money.
Where it runs out
The heat ceiling is around 110 °C, lower than nitrile in oil service and well short of HNBR. Oil resistance is moderate, so a part sitting continuously in hot petroleum oil will swell more than a nitrile equivalent. And it is not the cheapest option, so it does not win a purely cost-driven comparison against a general-purpose nitrile or SBR.
Typical uses
- Gaskets and weather seals that also see incidental oil
- Vibration mounts and bonded metal assemblies
- Bridge and structural bearings
- Transit and mass-transit parts with flammability requirements
- General-purpose parts with several moderate requirements and no dominant one