Struktol WB 42 is a zinc‑free rubber processing aid from Struktol Company, composed of a blend of fatty acid derivatives. Designed for use across all elastomers—including EPDM, NR, SBR, NBR—it delivers both internal and external lubrication to enhance flow, cavity fill, mould release, and extrudability, without interfering with peroxide cure
Struktol WB 42
Rubber Processing Additive WB‑42
| Property | Typical Value | Notes |
|---|---|---|
| Appearance | Yellowish pastilles | Solid form |
| Specific Gravity | ≈ 1.0 | Density ~1000 kg/m³ |
| Dropping Point | 85–95 °C | Melting range |
| Storage Stability | ≥ 24 months | Under normal dry storage |
| Packaging | ~20 kg | Varies by region |
| Disclaimer | The above specifications are provided for reference purposes only. For precise and up‑to‑date technical details, please contact our marketing team. |
Enhances filler dispersion and improves batch‑to‑batch uniformity.
Improves flow, cavity filling, and reduces mould release force.
Suited for extrusion, continuous vulcanization, transfer & injection moulding.
Does not interfere with peroxide curing; negligible tendency to bloom even at higher dosage
Applicable in compounding of natural rubber (NR), synthetic elastomers (SBR, NBR, EPDM), especially in:
Extrusion and continuous vulcanization
Injection and transfer moulding
High‑fill formulations using mineral fillers
Any rubber formulation where improved flow, release, and dispersion are desired
Typical: 2–5 phr (parts per hundred rubber)
For high‑filler (especially mineral filler) compounds: up to 7 phr may be required
1 kg sample packs (on demand)
20 kg bags
Transportation and courier options available across India
Store in a cool, dry, well‑ventilated place
Shelf life up to 24 months in original sealed containers
Struktol Company’s official WB 42 Technical Data Sheet
SpecialChem / Knowde summaries of WB 42 properties and usage
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