Vinyl - Nitrile Rubber Blends (NBR / PVC)
Properties and Applications
Nitrile-butadiene rubbers (NBR) are fully compatible with (plasticized) polyvinyl chloride (PVC) and therefore can be compounded together to produce homogenous blends (alloys) with superior properties. The PVC portion provides increased ozone, flame and weathering resistance, whereas the NBR portion provides good abrasion and chemical resistance including oil, fuels, and other nonpolar compounds. The addition of PVC to NBR also increases the pigment-carrying capacity in colored compounds, resulting in better retention of bright colors. The blend also exhibits lower plasticizer volatility due to the stronger affinity of nitrile rubber for conventional liquid plasticizers.1
Depending on the PVC and plasticizer content, NBR-PVC blends offer elasticity, increased compression set resistance, and good low temperature flexibility. Typically, the elongation at break increases with increasing level of NBR whereas the tensile strength increases with increasing level of PVC.1
NBR/PVC elastomers are used in many industries and markets including furniture, building & construction, automotive interiors, footwear, industrial and household goods, and food packaging. Some major applications include safety shoe soles, soft printer rollers, industrial flooring, colored cable jackets and colored hose covers.
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