Chloroprene rubber (neoprene)

STANDARDASTM D2000 (BC, BE)FORMO-ring, seal, liningTrade nameNeoprene

The first commercial synthetic rubber. Balanced resistance to ozone, ageing and chemicals; used with refrigerants, ammonia and in outdoor applications.

HARDNESS: Shore A 50–90
LOW-TEMPERATURE FLEXIBILITY °C: ≈ −40
TEMPERATURE: −40 … +121 °C
COST

Representative sample of CR: O-ring and sheet specimen — REPRESENTATIVE IMAGE · Colour is an industry habit; do not identify the material by its colour.

Chemical compatibility

Mechanical properties

TYPE	Heat resistance °C	Low-temperature flexibility °C	Typical hardness
General-purpose compound	≈ 121	≈ −40	Shore A 50–90

Service temperature

−40 °C+121 °C−200−1000100200300400500600700800

Media suitability GENERAL TREND

Water

Steam

Mineral oil

Fuel, aliphatic HC

Ozone, outdoor

Dilute acid

Caustic

Ketones, esters

Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.

Strengths and weaknesses

Strengths

Better resistance to ozone and ageing than NBR
Compatible with refrigerants, ammonia and CO₂
Good mechanical properties over a wide temperature range

Weaknesses

Not suitable for aromatic and chlorinated hydrocarbons
Swells in polar solvents (ketones, esters)

Manufacturing and use

ECONOMY: Low.
MANUFACTURING METHODS: Moulding (compression, injection) · Vulcanization
TYPICAL VALVE PARTS: O-ring · Seal · Bellows

Source: ASTM D2000 (BC, BE). Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.