SBR HS-SBR
Grade
also Buna-S
HS-SBR = high-styrene SBR resin
Blended in to stiffen and harden compounds (shoe soles, hard rolls, hard mats); brittle and not elastomeric on its own.
Values for the HS-SBR condition
Other SBR grades and fills
SBR is listed in 14 conditions; see the grade overview at SBR.
Compare all 14 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Sponge / closed-cell foamed SBR | Choose for low-force sealing, gasketing, padding and insulation where compressibility, not strength, is the requirement. | — | 2 | 200 | 20 Shore A |
Shore A 40 | Pick for soft seals, low-closure-force gaskets and cushioning where high flexibility matters more than strength. | — | 9 | 550 | 6 Shore D |
Flame-retardant SBR compound | Use for underground mining belts, cable jackets and transit parts requiring flame and smoke ratings. | — | 10 | 300 | 70 Shore A |
Shore A 50 | Balanced softness and strength for flexible gaskets, diaphragms and vibration pads. | — | 12 | 480 | 8 Shore D |
Oil-extended SBR | Pick when processing softness and cost per volume matter (tire treads, soft mats); oil lowers strength and increases extractables. | — | 13 | 480 | 55 Shore A |
SHA60Default Shore A 60 | Default workhorse compound for mats, gaskets, hose covers and molded goods needing wear resistance at lowest cost. | — | 15 | 400 | 12 Shore D |
Weather/ozone-protected SBR | Specify for outdoor-exposed mats, seals and covers; antiozonant/wax and high black loading slow cracking but SBR still ages faster than EPDM. | — | 15 | 380 | 65 Shore A |
Emulsion-polymerized SBR | Default commodity raw polymer route: cheapest, easy mixing and extrusion, used in general rubber goods and truck-tire compounds. | — | 16 | 400 | 13 Shore D |
Shore A 70 | Use where extrusion resistance and wear life dominate: tire treads, conveyor covers, wheels, bushings. | — | 18 | 350 | 20 Shore D |
HS-SBRThis page High-styrene SBR resin | Blended in to stiffen and harden compounds (shoe soles, hard rolls, hard mats); brittle and not elastomeric on its own. | — | 18 | 120 | 50 Shore D |
Shore A 80 | For rollers, scraper blades, skirting and pads where high stiffness and abrasion resistance are needed. | — | 20 | 250 | 28 Shore D |
SBR/NR blend compound | Blend NR in when higher tear strength, tack and lower heat build-up are needed while keeping SBR cost and wear resistance. | — | 20 | 450 | 60 Shore A |
Shore A 90 | Chosen for hard wheels, mallet faces and stiff pads; elongation and tear resistance are sacrificed. | — | 21 | 170 | 38 Shore D |
Solution-polymerized SBR | Choose for low-rolling-resistance / high-wet-grip tire treads and cleaner, more uniform compounds with silica reinforcement. | — | 22 | 450 | 15 Shore D |
What is SBR HS-SBR?
SBR HS-SBR is SBR in the HS-SBR grade — blended in to stiffen and harden compounds (shoe soles, hard rolls, hard mats); brittle and not elastomeric on its own. SBR HS-SBR has a tensile strength of 18 MPa (2.61 ksi), weaker than 70% of polymer grades. Elongation at break is 120% and the elastic modulus is 0.08 GPa (0.0116 Msi). SBR HS-SBR has a density of 1.05 g/cm³ (0.0379 lb/in³), lighter than 69% of polymer grades. Its glass-transition temperature is 25°C (77 °F). SHA60 is the default condition FabDigit quotes; HS-SBR is available on request or by drawing note.
Advantages
- Low embodied carbon — 3.2 kg CO₂/kg, better than 81% of polymer grades
Limitations
- Needs corrosion protection — 50/100, worse than 97% of polymer grades
- Difficult to machine — 35/100, worse than 84% of polymer grades
- Absorbs moisture — dry before molding — 1%, worse than 84% of polymer grades
- Difficult to weld — 12/100, worse than 80% of polymer grades
SBR HS-SBR properties
Typical room-temperature values for SBR HS-SBR; 18 are specific to this condition. Other listed values are SBR reference data and may not represent this condition. Bars are the position among polymer grades.
Physical4
SBR HS-SBR has a density of 1.05 g/cm³ (0.0379 lb/in³), lighter than 69% of polymer grades. Its glass-transition temperature is 25°C (77 °F).
Mechanical9
SBR HS-SBR has a tensile strength of 18 MPa (2.61 ksi), weaker than 70% of polymer grades. Elongation at break is 120% and the elastic modulus is 0.08 GPa (0.0116 Msi).
Thermal8
SBR HS-SBR is rated for continuous service to 75°C (167 °F). It conducts heat at 0.22 W/m·K (0.127 BTU/hr·ft·°F), better than 60% of polymer grades. Thermal expansion is 220 µm/m·K (122.2 µin/in·°F).
Electrical5
SBR HS-SBR is an electrical insulator with a dielectric strength of 20 kV/mm (508 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 97% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of SBR HS-SBR takes about 95 MJ of energy and emits 3.2 kg of CO₂ — less than 70% of polymer grades. Typical recycled content is 5%.
Manufacturability5
SBR HS-SBR's machinability is fair (35/100, worse than 84% of polymer grades); weldability not recommended (12/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with SBR HS-SBR
Is SBR easy to machine?
Cured SBR is die-cut, waterjet-cut or ground rather than machined; use sharp knives with water/soap lubrication and freeze or backing plates for close tolerances.
Can SBR be welded?
Not weldable as a thermoplastic; join by uncured splicing and re-vulcanization, hot bonding to metal (Chemlok primers) or cyanoacrylate/contact adhesive for cured parts.
Can SBR be formed, bent or molded?
Mixed on two-roll mill/Banbury, then calendered, extruded, compression/transfer/injection molded and sulfur-cured at ~150–180 °C; good green strength and easy extrusion, but tack is lower than NR.
What surface finishes work on SBR?
Surfaces can be buffed, ground or texture-molded; use chlorination or plasma to improve paint/adhesive adhesion, and post-cure oven cycle to reduce blooming and volatiles.
SBR chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| styrene (bound)23–24 % typical for E-SBR 1500/1502; ≥50 % in high-styrene resins | 15 – 40 | 23.5 |
| carbon black (N330/N550/N660)phr in the compound, not wt % of polymer | 0 – 80 | 50 |
| precipitated silicaphr; primary filler in S-SBR green-tire treads | 0 – 80 | 0 |
| process/extender oilphr; 37.5 phr in OE-SBR 1712 | 0 – 50 | 10 |
| sulfur + acceleratorsphr, sulfur cure system | 1.5 – 4 | 2 |
| zinc oxidephr activator | 3 – 5 | 4 |
| stearic acidphr activator | 1 – 3 | 2 |
| antioxidant / antiozonantphr, 6PPD/TMQ type | 0.5 – 3 | 1.5 |
| butadienebalance of the copolymer backbone | balance | — |
SBR HS-SBR — frequently asked
What is SBR HS-SBR used for?
SBR HS-SBR is typically used for tire treads, footwear soles, belts, gaskets and flooring. In short: lowest-cost general-purpose rubber; better abrasion than NR; tire-tread workhorse.
What is the tensile strength of SBR HS-SBR?
SBR HS-SBR has a typical tensile strength of 18 MPa (2.61 ksi) — weaker than 70% of polymer grades. Strength varies by condition: see the 14 listed tempers.
Is SBR HS-SBR easy to machine?
Not especially — machinability is rated fair (35/100, worse than 84% of polymer grades). Cured SBR is die-cut, waterjet-cut or ground rather than machined; use sharp knives with water/soap lubrication and freeze or backing plates for close tolerances.
Can SBR HS-SBR be welded?
Not readily — weldability is rated not recommended (12/100). Not weldable as a thermoplastic; join by uncured splicing and re-vulcanization, hot bonding to metal (Chemlok primers) or cyanoacrylate/contact adhesive for cured parts.
What surface finishes work on SBR HS-SBR?
Surfaces can be buffed, ground or texture-molded; use chlorination or plasma to improve paint/adhesive adhesion, and post-cure oven cycle to reduce blooming and volatiles.
Can SBR HS-SBR be formed, bent or molded?
Mixed on two-roll mill/Banbury, then calendered, extruded, compression/transfer/injection molded and sulfur-cured at ~150–180 °C; good green strength and easy extrusion, but tack is lower than NR.
What is the maximum service temperature of SBR HS-SBR?
SBR HS-SBR is rated for continuous use to about 75°C (167 °F), and briefly to 120°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASTM D2000 — Classification System for Rubber Products in Automotive Applications — ASTM (2020)
- ASTM D1418 — Rubber and Rubber Latices Nomenclature — ASTM (2017)
- Vanderbilt Rubber Handbook, 14th ed. — R.T. Vanderbilt (2010)
- The Rubber Formulary / Rubber Technology Handbook — Noyes / Hanser (1999)
- IISRP Synthetic Rubber Manual (SBR grade series) — IISRP (2012)
- Materials Selection in Mechanical Design (elastomer property/eco data) — Ashby / Elsevier (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.