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ASTM
D 1418 Designation: SBR
ASTM
D 2000, SAE J200 Type / Class: AA, BA
STANDARD
COLOR: Black
TRADE
NAMES: Too numerous to list.
RELATIVE
COST: Low
GENERAL
TEMPERATURE RANGE: -50° to +212° F
Also known as Buna
S, or GRS (Government Rubber Styrene), styrene
butadiene is a copolymer of
styrene and butadiene (see Figure 49).
Though SBR’s low strength properties require
the addition of reinforcing
agents to make the compound stronger,
SBR was widely used as the synthetic substitute for natural
rubber during World War II. Like natural
rubber, SBR is non oil-resistant.
SBR’s
use since WWII has sharply declined, though it
is still used in automobile tire production and
in assorted molded rubber goods. SBR is unsuitable
for some applications because the double
bond in the polymer backbone
invites attack by oxygen, ozone,
and UV light.
SBR
PERFORMS WELL IN:
• Water
• Alcohol
• Silicone oil & grease
• Automotive brake
systems
SBR
DOES NOT PERFORM WELL IN:
• Petroleum oils & fuels
• Strong acids
• Aromatic, aliphatic,
or halogenated hydrocarbons
• Mineral oils
MATERIAL
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