N85 Type Natural Silica Kaolin Filler CAS 61790-53-2 for Molded Rubber Goods Gasket O-ring
N85 Type Natural Silica Filler CAS 61790‑53‑2 is purified and classified natural siliceous earth mineral filler. With moderate particle size and porous microstructure, it provides good semi‑reinforcing performance for compression‑molded rubber. It optimizes hardness, compression‑resistant property and dimensional stability of gaskets and O‑rings, reduces shrinkage during vulcanization. It has good compatibility with NR, NBR, EPDM and other rubber systems, lowering formulation cost for molded rub
Overview
Our N85 Type Natural Silica Filler CAS 61790‑53‑2 is processed from high‑quality diatomite ore through impurity removal, fine grinding and particle screening. This grade is tailored for compression‑molded rubber goods, rubber gaskets and O‑ring sealing parts. Strict control of oversize particles effectively decreases surface defects of molded sealing products. It can be compounded with carbon black, talc to balance mechanical performance and production cost for rubber sealing elements.
Key Features
- Semi‑reinforcing effect, enhance rubber hardness, tensile strength and wear performance of sealing parts.
- Improve compression set resistance, help rubber gasket and O‑ring maintain stable sealing performance under long‑term compression.
- Lower vulcanization shrinkage, boost dimensional accuracy of complex molded rubber goods.
- Strictly controlled coarse particles, reduce surface blemishes on finished molded rubber components.
- Excellent dispersion in NBR, EPDM, NR, SBR and other common rubber matrices.
- Good compatibility with vulcanizing agents, accelerators and anti‑aging agents, no interference to normal vulcanization procedure.
Main Applications
- Compression molded rubber gaskets and flat sealing pads
- Rubber O‑rings and various static sealing rubber parts
- General molded industrial rubber goods
- EPDM, NBR, NR rubber compound for sealing elements
- Mechanical sealing rubber accessories requiring stable dimension
Usage Recommendation
- Typical dosage: 12‑35 phr, adjust according to target hardness, compression set requirement.
- Add in internal mixer or open mill together with other fillers, achieve sufficient kneading dispersion.
- Raw material must be fully dried before feeding; moisture will cause bubble defects on molded rubber surface.
- Sieve inspection for incoming material is suggested to remove occasional coarse impurities.
- Complete lab compounding, vulcanization and compression set test before mass production.
Storage & Package
- Store in dry and ventilated warehouse, keep bags tightly sealed against moisture absorption.
- Standard package: 25kg woven bag with inner PE liner.
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