O-ring material
SBR O-Rings
SBR O-rings are the styrene-butadiene seal, the general-purpose synthetic rubber that replaced natural rubber in tires and low-cost seals, chosen for water, glycol brake fluid and abrasion at a low price. Standard SBR compounds are rated from -46 C to 100 C (-50 F to 212 F) in dry heat, and the compound sheet governs a specific grade. Conquest supplies SBR O-rings in AS568 and metric sizes as a distributor, quoted in the compound the print names.
- Family
- SBR
- Standard range
- -46 C to 100 C (Apple Rubber's printed -50 F to 212 F in Celsius, dry heat)
- Durometers
- By compound; the compound sheet states it
- Standards
- ASTM D1418 SBR; ASTM D2000 line callouts on specific compounds
- Product
- O-rings in AS568 and ISO 3601 sizes, quoted in the compound the print names
Ranges are the handbook family figures; the compound datasheet and your application govern the final choice.
Larger and non-standard sizes: an O-ring beyond the molded size lists can be supplied as a spliced and vulcanized O-ring, which the maker joins from cord of the same compound. That page lists, family by family, which makers offer the compound as cord, and what to send for a quote.
What SBR is, and where it is chosen
Styrene-butadiene rubber is the commodity synthetic: tough, abrasion-resistant and inexpensive, with the resilience of natural rubber and better aging. In seals it serves water, weak acids and bases, alcohols and glycol brake fluid in low-cost glands where nothing aggressive is present, and it is the family behind many hydraulic brake cups. The Parker® handbook lists SBR only on its temperature chart and in its compatibility table, without a text figure. The range on this page, -46 C to 100 C, is Apple Rubber's printed standard-compound range of -50 F to 212 F (dry heat only) in Celsius; the compound sheet you order from governs.
Where SBR fails
Petroleum oils, greases, fuels and most solvents swell it, ozone and sunlight crack it, and heat ages it faster than nitrile or EPDM. Where the medium is oil, nitrile is the low-cost answer; where the seal sits outdoors or in steam, EPDM. SBR earns its place only on price where water or brake fluid is the medium and the gland is easy.
How to specify
Send the AS568 dash number or the inside diameter and cross-section, the durometer, the medium and the temperature, and any ASTM D2000 line callout. The quote names the compound your print or your engineering specifies and sends its datasheet with the range it carries.
Sizes and forms we supply
All 369 AS568 sizes (349 general-purpose dash sizes plus the 20 boss-seal sizes) and the ISO 3601 metric series, in the durometers listed above; O-ring cord for rings spliced and vulcanized by the maker in odd diameters (static service only), where the compound is made as cord. The AS568 chart and the AS568 sizes in millimeters carry the dimensions, and the dash number guide explains the numbering.
Sources: Apple Rubber, Seal Design Guide, Styrene Butadiene (standard compound, dry heat only), read 2026-09-27; AS568 size count, 369 sizes (349 general-purpose plus 20 boss): Parker O-Ring Handbook ORD 5700, section IX size tables (Series 2-XXX and the 3-9XX boss table), read 2026-09-27; Parker O-Ring Handbook ORD 5700, section 2.2 (read 2026-09-14) (Figure 2-3 and the compatibility table, family named only); ASTM D1418; ASTM D2000 (documents named, not reproduced); Parker O-Ring Handbook ORD 5700, page 2-10 (hardness guidance), read 2026-09-25.
Parker is a trademark of Parker Hannifin Corporation. Apple Rubber is a trademark of its owner; no affiliation or endorsement is implied.
Frequently asked
What is SBR used for?
Low-cost seals in water, weak chemicals and glycol brake fluid, and brake cups, where abrasion resistance and price matter more than oil or weather resistance.
What temperature range does SBR have?
Standard SBR compounds run -46 C to 100 C (-50 F to 212 F) in dry heat, Apple Rubber's printed range; the compound datasheet governs a specific grade.
Can SBR handle oil?
No. Oils, greases and fuels swell it; nitrile serves those at similar cost.
SBR or natural rubber?
SBR ages better and costs less; natural rubber is more resilient and stronger in tension. Neither handles oil or ozone.
Which durometer?
The compound sheet states it; for most applications the Parker handbook puts the usual choice at 70 to 80 Shore A (ORD 5700, page 2-10). The durometer guide covers the choice.
Related guides
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Send the part number and the quantity for SBR
The AS568 dash number or the inside diameter and cross-section, the durometer, the quantity, the medium and temperature, and any specification the print names. A Conquest representative replies. Quotes answered within one business day. A person answers (714) 632-9830, Pacific business hours.
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