Chloroprene Rubber (CR, commonly referred to as Neoprene) is widely specified across demanding industrial rubber applications due to its balanced combination of tensile strength, oil resistance, thermal stability, and weatherability. However, selecting the optimal CR grade requires aligning chemical modification types and raw polymer viscosity with processing methods and cold-weather endurance requirements.
1. General-Purpose Grades
Skyprene general-purpose grades are mercaptan-modified polymers offering excellent mechanical strength, oil and weather resistance, and dynamic resilience.
SKYPRENE B-30 (Standard Baseline ):
Featuring a medium Mooney viscosity (ML1+4 100℃ = 49), B-30 offers balanced physical properties (Tensile Strength Ta = 23.1 MPa, Elongation Ea = 390%) and good storage stability. Ideal for molded parts, belts, and industrial hoses.
SKYPRENE B-31 (Low Viscosity, High Flowability):
A low-viscosity variant (ML1+4 = 42) of B-30. Lower Mooney viscosity reduces frictional heat generation during mill mixing, improving dimensional stability and processing speed in extrusion, injection, and high-speed calendering.
SKYPRENE Y-30S & Y-31 (High Viscosity & Ultra-High Filler Loadings):
Y-30S possesses an exceptionally high Mooney viscosity (ML1+4 = 127). It permits compounding with high volume fractions of carbon black/fillers and process oils without compromising tensile strength (23.8 MPa), drastically reducing formulation costs. Y-31 (ML1+4 = 100) provides improved processability and fluidity over Y-30S, making both grades premier choices for high-strength solvent-based industrial adhesives.
SKYPRENE P-90 (Xanthogen-Modified):
Xanthogen-modified grade providing elevated mechanical modulus and higher tensile strength (26.0 MPa). Its crystallization rate is slightly faster than B-30, allowing rapid green strength development for dynamic high-load applications.
2. Crystallization-Resistant Grades
Under sub-zero operational temperatures, standard CR polymers tend to undergo molecular alignment (crystallization), resulting in physical hardening and elasticity loss. Crystallization-resistant grades introduce structural irregularity into the polymer chain to suppress crystal growth.
SKYPRENE B-5 & B-5A (Extreme Cold Endurance):
B-5 and B-5A offer superior resistance to crystallization. B-5A exhibits the lowest permanent set at -10℃ (7%, compared to 36% for B-30), ensuring zero hardening and optimal sealing pressure in sub-zero operational environments.
SKYPRENE B-10, B-10H, B-11, B-12 (Graded Resistance) :
Positioned between B-30 and B-5 in crystallization rate. Compounders can select specific Mooney viscosities ranging from B-12 (ML = 39) for easy molding, B-10/B-11 (ML = 46-52) for standard processing, up to B-10H (ML = 70) for high structural green strength.
SKYPRENE B-25 (High Elongation):
Balances medium crystallization resistance with superior tensile elongation (410%), ideal for flexible boots, bellows, and seals operating in cold climates.
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