NBR 3345 is a nitrile butadiene rubber grade considered for oil-resistant seals, hoses, gaskets, rollers and moulded components. Qualification should connect the producer’s raw-material specification to the actual service medium, processing route and finished-part tests.
Why manufacturers evaluate NBR 3345
- Oil-resistant positioning: designed for compounds used around lubricants, fuels and hydrocarbon-based fluids.
- Practical application range: commonly evaluated for static and dynamic sealing, hose and moulded rubber products.
- Controlled processing: Mooney viscosity and compound design influence mixing, forming and cure consistency.
- Grade-specific evidence: acrylonitrile content and other limits must come from the offered producer’s documents.
- Application approval: fluid compatibility, temperature, compression and movement are verified in the finished component.
NBR 3345 technical review
Linwell does not publish a universal numerical specification for NBR 3345 because values and methods can vary by producer. Each offer should identify the source and include the current documents needed for a buyer’s own qualification process.
| Parameter or condition | Evidence | Buyer check | Risk controlled |
|---|---|---|---|
| Acrylonitrile content | Producer TDS and stated test method | Compare with the approved performance window | Oil resistance and low-temperature flexibility balance |
| Mooney viscosity | TDS range and batch COA result | Review against mixing and forming capability | Processing variation and compound consistency |
| Volatile matter and ash | TDS limits and COA values | Use the same incoming test methods where applicable | Moisture, contamination and lot consistency |
| Cure response | Standard-recipe data and buyer trial | Record cure curve and processing conditions | Scorch, cure time and finished-property variation |
| Packaging and traceability | Labels, lot number, bale and pallet information | Verify at receipt and preserve identity | Mix-up prevention and audit trail |
Typical applications
Sealing systems
O-rings, gaskets and seals may use NBR 3345 where the compound is compatible with the exact fluid and operating temperature.
Oil and fuel hoses
The polymer can support hose compounds, but reinforcement, permeation, pressure and complete hose testing remain essential.
Rollers and moulded parts
Industrial rollers, diaphragms and moulded components can be evaluated for the required hardness, wear and fluid exposure.
How to select and qualify the material
Define the operating environment and the production process before comparing suppliers. A useful request includes the finished product, service conditions, current material, critical raw-material controls, trial plan and commercial quantity.
| Decision input | What to provide or verify | Purpose |
|---|---|---|
| Fluid identity | Provide the exact oil, fuel, grease or chemical mixture | Different formulations can affect the same elastomer differently |
| Thermal duty | Define continuous and peak temperature plus cold-start conditions | Temperature affects flexibility, ageing and sealing behaviour |
| Mechanical duty | State pressure, compression, movement and abrasion | Static and dynamic parts require different validation |
| Production process | Share mixing, extrusion or moulding constraints | Material and process must be qualified together |
| Release tests | List raw-material and finished-part acceptance criteria | Creates a clear go/no-go decision |
Documents buyers should request
- TDS: current producer specification, declared characteristics and test methods.
- SDS: handling, storage, transport and safety information for the offered material.
- Batch COA: reported results and lot identity for the supplied batch.
- Origin and traceability: producer, country of origin, lot number, bale labels and packaging information.
- Commercial confirmation: quantity, lead time, Incoterm, shipment plan and document timing.
Packaging, storage and lot control
Agree bale format, wrapper, palletisation, minimum order, shipment plan and lot allocation before purchase. Inspect packaging on arrival, record lot numbers and store the material according to the producer’s instructions.
Quality and trial guidance
Retain the TDS, SDS, COA, receiving record and trial report under the same supplier and lot reference. When changing source or lot, compare cure behaviour and finished-part performance under documented conditions.
Prepare your inquiry
Send the service fluid, temperature range, component type, process, current NBR reference, trial quantity and annual demand. Linwell will confirm the offered NBR 3345 source and available qualification documents.