What is mineral fibre?

Per GB/T 4132-1996, man-made mineral fibres are the general term for inorganic fibres made from rock, slag, glass, metal oxides or porcelain clay. Boer products are made mainly from natural rocks such as diabase, basalt and dolomite, processed by melting, wet-process purification and surface treatment.

What does Boer's wet process mean?

Raw materials are melted in a cupola furnace and fibreised by a four-roll centrifugal spinner. Fibres are separated from shot in the settling chamber, then collected by hub collectors, purified, dried and packaged. The water medium eliminates electrostatic attraction between fibres and shot, and separates them by their different gravity and drag in motion.

What is shot content and how is it controlled?

Shot refers to non-fibrous material in the fibre (usually counted above 125 μm). Boer separates fibre from shot in the settling chamber through the wet process; some models control non-fibrous content below 1%. Specific values are subject to the batch test report.

Melting point and heat resistance?

Standard models have a melting point above 1000 ℃; the white-fibre series (e.g. BE-B03, BE-B07, BE-C08) has a melting point above 1600 ℃. Specific values are subject to the batch test report.

Dispersibility and resin bonding?

The wet process gives a more uniform surface treatment; the fibre is hydrophilic and easy to disperse, bonding well with phenolic resin, and is suitable for friction and sealing material formulations.

Does Boer fibre contain asbestos?

No. Boer products are asbestos-free man-made mineral fibres and have passed SGS asbestos testing (report CANEC25025290506, 2025-10-22); all 6 asbestos types, including chrysotile, were not detected (XRD/PLM, detection limit 0.1%).

Is Boer fibre RoHS/SVHC compliant?

Yes. Products have passed RoHS 10-substance testing (CANEC25025290502) and SVHC 250-substance testing (CANEC25025290504), complying with applicable REACH requirements.

Is an MSDS/SDS available?

Yes. Boer can provide MSDS/SDS prepared in accordance with REACH Annex II (e.g. EECSSDS2605060802), and the batch test report is delivered with each shipment.

What are the packaging and storage requirements?

Normally moisture-proof laminated bags or eco-friendly paper bags, with custom packaging on request. Store in a dry, ventilated place away from moisture, open flame and strong oxidizers.

How can I select a product and contact Boer?

Call the national sales hotline 4006-0763-82 or email info@boerfibre.com. Boer provides selection advice, samples and batch test reports.

Kevlar® pulp

Category Raw Materials Published 2026-03-31 Source www.boerfibre.com

Abstract

This article introduces DuPont's Kevlar® pulp. Para-aramid — poly(p-phenylene terephthalamide) (PPTA) — fibres show lyotropic liquid-crystal behaviour. Kevlar® fibres combine high tensile strength, high modulus, heat resistance, resistance to acids, alkalis and most organic solvents, and good dimensional stability. Standard Kevlar® fibre is reported to have a weight-specific tensile strength about 6 times that of steel wire, 3 times that of glass fibre and 2 times that of high-tenacity nylon industrial yarn; it retains about 75% of its strength after 100 hours at 200 ℃ and about 95% after 500 hours at 160 ℃.

Kevlar® products include filament yarn, short fibres and pulp. The pulp is made by shearing filament into short fibres, dispersing them in water and fibrillating them to obtain a product of high specific surface area and short length (specific surface area up to 7–10 m²/g). With short length, abundant fibrillation, a high length/diameter ratio and high specific surface area, the pulp disperses well in a matrix and is used in friction and sealing composites as an asbestos replacement. The article notes that in some countries pulp accounts for up to 96% of aramid consumption, and that in 2007 China's total aramid demand was above 600 tonnes, mainly for premium passenger-car brake pads and marine/petrochemical gaskets.

Key facts

Producer / brand: DuPont Kevlar® para-aramid pulp (PPTA, lyotropic liquid crystal)
Product forms: filament yarn, short fibres, pulp
Pulp process: shear filament → disperse in water → fibrillate; specific surface area up to 7–10 m²/g
Strength (standard Kevlar®): about 6× steel wire, 3× glass fibre, 2× high-tenacity nylon (weight-specific tensile strength, per original article)
Heat retention: about 75% strength after 100 h at 200 ℃; about 95% after 500 h at 160 ℃
Friction-material benefits cited: thermal stability, longer service life, lower disc wear, lower brake noise, easier uniform mixing, less dust in production
Sealing-material benefits cited: thermal and chemical stability, dimensional stability, toughness, radiation resistance, oriented microstructure
Market note: pulp up to 96% of aramid use in some countries; China aramid demand above 600 t in 2007 (per original article)

The original article is in Chinese; see the Chinese version for the full text. This page provides the English title, abstract and key facts only — translated and compiled from the original, without full verbatim translation.

Kevlar® pulp

Abstract

Key facts

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