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Rubber in Nitrile rubber (NBR)
Nitrile rubber (NBR) is one of the most economical choices for rubber: excellent resistance to petroleum oils, fuels, greases and hydraulic fluids. On a representative extruded seal at 5,000 pieces it estimates at about $1.35 per part plus $750 tooling, with a lead time of 3–4 weeks. Typical tolerance is ISO 3302-1 class E2 typical: ±0.010–0.020 in (±0.25–0.50 mm) on sections under 0.25 in (6 mm).
- Per part
- $1.35
- Tooling
- $750
- Lead time
- 3–4 weeks
Price it in NBR
Extruded seal · Rubber
Order total $7,810
- Tooling
- $750
- one-time, spread over the order
- Piece price
- $1.35
- before setup + tooling
- Lead time
- 3–4 weeks
- to first production
Size
Drag a row to adjust · click to type
Profile width / OD12.012.0 mm
Hollow / ID7.007.00 mm
Cut length900900 mm
Quantity
Price per part falls as volume rises
Exact quantity50005000 pcs
Material
Design checks pass
Open in builderBudgetary estimate for a representative part. Firm quotes come from principals after drawing review.
NBR vs other rubber materials
The same extruded seal at 5,000 pieces, priced in every material the process runs. TPE is the lowest all-in cost.
| Material | Per part | All-in | Weight | Tensile |
|---|---|---|---|---|
| TPE (thermoplastic elastomer) | $1.23 | $1.44 | 85 g | 7 MPa |
| EPDM rubber | $1.32 | $1.53 | 97 g | 12 MPa |
| Nitrile rubber (NBR) | $1.35 | $1.56 | 101 g | 14 MPa |
| Neoprene (CR) | $1.92 | $2.13 | 114 g | 14 MPa |
| Silicone rubber (VMQ) | $2.28 | $2.49 | 97 g | 8 MPa |
| FKM fluoroelastomer (Viton) | $12.70 | $12.90 | 156 g | 12 MPa |
NBR at a glance
- Tensile strength
- 14 MPa9th pct
- Density
- 1.2 g/cm³26th pct
- Max service temp
- 100 °C10th pct
- Elongation
- 300 %89th pct
- Relative cost
- $$$$$
Bars are relative to the strongest, densest or hottest material in the SSG library. Percentile vs all 48 materials.
Strengths
- Excellent resistance to petroleum oils, fuels, greases and hydraulic fluids
- Good abrasion and tear resistance for dynamic seals
- Low cost, with the widest selection of O-ring sizes and compounds
- Good compression set in 70 Shore A O-ring compounds
Watch for
- Poor ozone, UV and weather resistance; cracks outdoors without protection
- Attacked by glycol brake fluid, ketones, esters and chlorinated solvents
- Limited to about 250 °F (121 °C) short term; use HNBR or FKM hotter
Rubber design rules
About 0.030 in (0.8 mm) minimum, with even thickness around the profile
Keep walls uniform
15–30% compression for static seals; 10–20% for dynamic seals
Size seal squeeze
Seal volume no more than about 85% of groove volume
Limit gland fill
Inside corner radius at least 0.020 in (0.5 mm)
Radius corners
±5 Shore A points
Specify durometer tolerance
Place flash and mismatch on non-functional surfaces
Keep parting lines off sealing faces
Questions
How much does rubber in NBR cost?
For a representative part (d-bulb extrusion 12 mm / 7 mm hollow, cut to 900 mm), SSG's estimator gives about $1.35 per part at 5,000 pieces, plus about $750 one-time tooling. All-in with tooling and setup that is $1.56 per part. It is budgetary; principals quote firm prices from your drawing.
Is NBR a good material for rubber?
It is when you need excellent resistance to petroleum oils, fuels, greases and hydraulic fluids and good abrasion and tear resistance for dynamic seals. Watch for poor ozone, uv and weather resistance; cracks outdoors without protection. Of 6 materials run in rubber, it ranks 3 on all-in cost for the same part.
What tolerance can rubber hold in NBR?
Typical capability is ISO 3302-1 class E2 typical: ±0.010–0.020 in (±0.25–0.50 mm) on sections under 0.25 in (6 mm). Tighter tolerances are possible on called-out features at added cost; specify them on the drawing rather than as a blanket note.
Quote rubber in NBR.
Upload your CAD or start from a template. The DFM check applies the rules above to your geometry.