NBR (Nitrile Rubber) vs PPA (Polyphthalamide): 0% composition overlap. Significantly different materials serving different application areas.
NBR (Nitrile Rubber) vs PPA (Polyphthalamide)
Side-by-side chemical composition and mechanical property comparison.
Overview
NBR (Nitrile Rubber)
Nitrile butadiene rubber (Buna-N) — THE oil and fuel resistant elastomer. ACN content (18-50%) determines the oil resistance vs low-temp flexibility tradeoff. Higher ACN = better oil resistance but stiffer at low temp. The most widely used seal material worldwide. Used for O-rings, fuel hoses, gaskets, hydraulic seals, oil seals, and nitrile gloves. Not suitable for ozone, UV, or polar solvents (ketones, esters). HNBR variant for higher heat resistance.
PPA (Polyphthalamide)
Polyphthalamide — semi-aromatic high-performance polyamide. 55%+ aromatic diacid (TPA/IPA) gives Tg ~125°C and Tm >310°C — far above PA66 (Tg 50°C, Tm 260°C). Much lower moisture absorption than aliphatic PAs. SMT-reflow compatible (260°C+). Trade names: Amodel (Solvay/Syensqo), Zytel HTN (Celanese), Ultramid T (BASF), Grivory HT (EMS). Used for automotive powertrain (thermostat housings, charge air coolers), SMT connectors, LED headlamp housings, and metal-replacement applications to 280°C.
| NBR (Nitrile Rubber) | PPA (Polyphthalamide) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 37 | ISO 527-1 |
Mechanical properties
| Property | NBR (Nitrile Rubber) | PPA (Polyphthalamide) | Unit |
|---|---|---|---|
| tensile_strength | 7–24 | 80–95 | MPa |
| elongation | 200–600 | 10–30 | % |
| hardness_shore_a | 40–90 | — | Shore A |
Compatibility Assessment
NBR (Nitrile Rubber) and PPA (Polyphthalamide) have significantly different compositions (0% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is NBR (Nitrile Rubber) the same as PPA (Polyphthalamide)?
NBR (Nitrile Rubber) and PPA (Polyphthalamide) have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace NBR (Nitrile Rubber) with PPA (Polyphthalamide)?
Generally not recommended. The compositions differ significantly (0% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between NBR (Nitrile Rubber) and PPA (Polyphthalamide)?
The main differences are in the following elements: overall alloying content. NBR (Nitrile Rubber) is a Polymers grade, while PPA (Polyphthalamide) is a Polymers grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.