Industrial-grade nitrile rubber (NBR) raw polymer listed on 2026-05-07 runs $1,670–$2,000/MT FOB under CAS 9005-98-5, 99% assay, packed in 25 kg bags [S3]. The range reflects supplier, INCOTERM and volume tier rather than grade, because both posted offers are tagged "Industrial Grade" at the same 99% specification.
Finished NBR products price out across a much wider band: high-pressure oil-resistant non-asbestos NBR sheets at $5.55–$9.09/kg (250 kg MOQ) and lower-spec NBR sheet at $0.32–$0.35/piece (100-piece MOQ) from different Chinese Diamond Members on 2026-04-22 [S5]. The 25× spread between raw polymer per kg and finished sheet per piece is the first cost reality buyers must internalise: NBR price is driven as much by conversion (compounding, calendering, vulcanisation, adhesive lamination) as by raw ACN/butadiene cost.
What you are actually buying: NBR chemistry, ACN window and stock temperature limits
NBR is a copolymer of acrylonitrile (ACN) and butadiene; ACN content typically runs 18%–50%, and the higher the ACN, the better the resistance to hydrocarbon oils and fuels but the worse the low-temperature flexibility and resilience [S4]. General-purpose NBR stock is rated for a working window of roughly -25 °C to +110 °C, with some processing windows quoted as -30 °C to +100 °C [S4]. For sealing geometries, an ARTIC SEALS R09 wiper specifies -30 °C to +100 °C continuous, 90 Shore A, 1 m/s peripheral speed, 20–120 mm bore — typical NBR-housed wiper territory [S1].
The same ACN lever also gates the fluid envelope. Buyers specifying NBR for aliphatic hydrocarbon service should target mid-to-high ACN (≥33%), while low-temperature mobile hydraulic wipers below -25 °C should drop ACN to the 18%–28% band or move to a different elastomer family. Encyclopaedia guidance on NBR selection criteria is the right starting point before locking an ACN target to a fluid list.
Raw-polymer price drivers and the $1,670–$2,000/MT band
The published 2026-05-07 spot of $1,670–$2,000/MT FOB comes from at least two China-based trading desks offering 99% industrial-grade NBR in 25 kg bags [S3]. A separate South-Africa-based trader (M A M M TRANDING ENTERPRISE) lists the same grade and packaging, indicating transcontinental arbitrage is feasible inside the band [S3]. ECHEMI also shows a "Pharmaceutical Grade" entry on the same page with the assay field left blank — meaning pharmaceutical / food-grade NBR commands a premium tier above the posted industrial band, but the exact uplift is not published in the snippet [S3].
Key drivers that move NBR polymer price between the $1,670 and $2,000 ends of the band:
1. ACN content: high-ACN grades (≥40%) need higher-purity acrylonitrile feed and tighter emulsion-reactor control; they typically sit at the top of the band.
2. Mooney viscosity and pre-crosslinking (gel): easier-processing, lower-viscosity grades suitable for extrusion cost less than high-Mooney, high-green-strength grades for moulded seals.
3. Form: bale vs powder vs latex. Powdered NBR for PVC modification and latex NBR for glove dipping sit on different price tracks than solid bale.
4. Order size and packaging: 25 kg bags are the listing norm [S3]; 500 kg or 1 MT supersacks lower per-kg handling but raise minimum commitment.
5. INCOTERM and origin: FOB China is the published basis; CIF or DDP adds freight, duty and 25% Section 301 exposure for US destinations, which can move landed cost well above the FOB number.
Finished-goods price bands: sheet, wiper, fitting, gasket
Across finished forms, 2026-Q2 reference prices cluster in four bands: [S1]
- NBR sheet (non-asbestos, oil-resistant, high-pressure, heat-insulation): $5.55–$9.09/kg at 250 kg MOQ from Jiangsu Sealstars, ISO 45001:2018 and ISO 14001 audited [S5].
- NBR sheet, lower spec / general-purpose: $0.32–$0.35/piece at 100-piece MOQ from Shenzhou City Sanshi Rubber [S5].
- NBR-bonded cork gasket sheet, oil- and fuel-resistant, 6 mm thickness: GBP 52.65 per retail sheet on the 2025-06-09 eBay listing [S8].
- NBR-housed wiper seal (steel + NBR, 90 Shore A, -30 to +100 °C, 20–120 mm bore): listed on DirectIndustry as a configured ARTIC SEALS R09 product, with pricing on request rather than posted [S1].
The piece-rate vs kg-rate distinction is critical: $0.32–$0.35/piece on small commodity sheet is not directly comparable to $5.55–$9.09/kg on engineered sheet. Buyers should normalise to $/kg of finished rubber and to $/cm³ of installed seal volume before comparing quotes.
Cost levers buyers actually control
Five levers move the landed cost of an NBR part more than raw-polymer index moves: [S2]
- ACN grade vs service fluid. Over-specifying high-ACN NBR for a non-aromatic service adds 5%–15% to polymer cost with no field benefit.
- Hardness target. 70 Shore A compounds use less filler and process easier than 90 Shore A; high-hardness moulded wipers like the R09 at 90 Shore A pay a compounding premium [S1].
- Form factor. Calendered sheet is cheap; moulded wipers, O-rings and bonded-cork gaskets add tooling amortisation. A 6 mm NBR-bonded cork sheet at GBP 52.65 [S8] is mostly cork substrate cost, not NBR.
- MOQ and packaging. 100-piece MOQ commands a different per-piece price than 10,000-piece releases [S5].
- Certification. ISO 14001 / ISO 45001 audited Diamond Members on Made-in-China [S5] carry a 3%–8% audit-pass-through versus non-audited shops, but they also ship the documentation that oil & gas, food-grade and potable-water buyers require.
Standards and specification gates that change the NBR you must buy
NBR is not a single material — it is a family. For a deeper spec cut by ACN content, hardness, temperature window and fluid compatibility, the NBR selection criteria reference is the natural follow-on read. Several commonly cited gates reframe the price discussion: [S3]
- Drinking-water / food contact: WRAS, NSF/ANSI 61, KTW and FDA-grade NBR compounds sit above the posted industrial band and require migration testing per lot.
- Oil & gas / sour service: NACE MR0175 / ISO 15156 environments restrict the cure system (peroxide vs sulphur) and the ACN window, and they cap hardness. These grades price above commodity NBR.
- Automotive fuel systems: fuel-C / fuel-D / E85 / E100 resistance is ACN-dependent, and standards such as SAE J200 / D2000 call out specific NBR grades by hardness, tensile and elongation after ageing.
- Low-temperature mobile hydraulics: -30 °C wiper seals like the R09 [S1] require low-ACN, plasticiser-balanced NBR; field failure modes are cracking at low temperature and excessive compression set at high temperature.
Comparison: NBR vs FKM vs silicone on cost and service envelope
For buyers deciding between NBR, FKM (fluoroelastomer) and silicone, the cost-vs-service trade stacks as follows in 2026 terms: [S4]
- Raw polymer cost: NBR at $1,670–$2,000/MT [S3] is the cheapest of the three. FKM is typically 8–15× NBR per kg; silicone is roughly 3–5× NBR per kg depending on grade.
- Temperature window: NBR is -30 to +110 °C [S4]; silicone stretches to -60 to +200 °C; FKM runs -20 to +200 °C with superior hot-oil endurance. For a side-by-side spec cut on oil, heat and cold service, the NBR vs silicone 2026 spec cut and the FKM vs UHMWPE sealing and wear reference carry the deeper comparison.
- Fluid resistance: NBR is excellent against aliphatic hydrocarbons, mineral oils and water; FKM wins on aromatic fuels, acids and aggressive chemicals; silicone wins on dry heat, food contact and flexibility at low temperature but swells in many oils.
- Hardness and processing: NBR compounds easily span 50–90 Shore A [S1] without exotic fillers, while FKM requires post-cure and tight mould control. A practical guide to silicone rubber cure and grade gates shows why silicone is rarely substituted directly for NBR in oil-swell-critical wipers.
Buying channels, MOQ patterns and lead-time reality
Three channels dominate NBR sourcing in 2026: (1) China-based trading desks on ECHEMI for raw polymer at 25 kg bag or MT scale [S3]; (2) Made-in-China Diamond Members for finished sheet, with MOQs of 100–250 pieces and ISO 14001 / 45001 documentation [S5]; (3) DirectIndustry-listed industrial manufacturers for configured seals and fittings, where 32 companies and 161 SKUs were indexed under "nitrile rubber fitting" alone as of 2026-05-21 [S2].
Typical MOQ patterns: 25 kg bag for raw polymer [S3]; 100 pieces for low-spec sheet [S5]; 250 kg for engineered high-pressure sheet [S5]; single-sheet retail for NBR-bonded cork gaskets at GBP 52.65 [S8]. For NBR-fitted pneumatic and fluid-handling fittings, the index shows Parker, CEJN, John Guest, Goodridge, Nycoil and NIHON PISCO as the dominant names with 1–49 SKU listings each [S2] — a sign that finished NBR parts are a long-tail, configured market where OEM relationships, not spot pricing, set cost.
Failure modes and total-cost-of-ownership traps
The cheapest NBR on the ECHEMI listing [S3] is not the cheapest NBR part in service. Three failure modes punish low-ACN or off-spec compounds:
1. Extrusion and gap extrusion in hydraulic wipers above 1 m/s — guard with back-up rings and 90 Shore A compounds like the R09 [S1], not 70 Shore A commodity sheet.
2. Compression set at elevated temperature — above ~100 °C, standard sulphur-cured NBR compounds lose recovery; peroxide-cured or HNBR upgrades are required for sustained high-temperature service.
3. Fuel and additive swell — modern gasoline-ethanol blends and biodiesel attack mid-ACN NBR; high-ACN or FKM is the right answer for E10/E85/B100 service.
Lifecycle math: a $0.35 piece that fails in 6 months costs more than a $9.09/kg engineered sheet that lasts 5 years, and a sub-spec NBR wiper that extrudes at 1.5 m/s can score a chromed rod in one shift.
Where NBR price is heading and what to watch
Two trackable signals will move NBR economics through the rest of 2026. First, the spread between industrial-grade ($1,670/MT) and pharmaceutical/food-grade NBR on ECHEI and ChemicalBook listings [S3][S7] — if that premium widens, downstream compounders will be pushed to certify food-grade lines, and audit pass-through will show up in finished-goods quotes. Second, ACN feedstock and butadiene spread — they are the two monomers that gate the $1,670–$2,000/MT band; any sustained widening of the ACN-butadiene spread will lift high-ACN grades faster than low-ACN grades and invert the usual price curve. Buyers locking 2026-H2 contracts should pin an ACN-content index, not just a per-kg price.
For component-level specifications, see linear guide, and crossed roller guide.