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.

Precipitated barium sulfate

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

Abstract

The ore rich in barium sulfate is barite (baryte), with BaSO₄ content varying 30–97% by deposit grade and often containing Sr, Ca and other impurities. It is described as chemically stable, insoluble in water and hydrochloric acid, non-magnetic and non-toxic, with Mohs hardness 3–3.5 and specific gravity 4.3–4.5. Barite powder is widely used in friction and sealing materials — in friction materials it is an established inorganic filler — helping to stabilise the friction coefficient, lower wear rate and leave a smooth, clean friction surface that does not attack the counterpart; foreign practice sometimes uses barite alone as a friction modifier at 8–35%.

Because raw barite ore powder varies widely in BaSO₄ content and causes quality fluctuation, precipitated barium sulfate provides a more consistent option. The process described: calcine barite with coal powder in a reducing furnace, purify and water-leach the barium sulfide, react with sodium sulfate (Glauber's salt) under steam heating to precipitate BaSO₄, then wash, dry and mill. Reported product parameters include BaSO₄ above 97%, specific gravity 4.35–4.43, hardness 3–3.5 Mohs, orthorhombic crystal, fineness 95% passing 200 mesh / 85% passing 325 mesh, whiteness 70%.

Key facts

Ore: barite; BaSO₄ content 30–97% by grade; Mohs 3–3.5; specific gravity 4.3–4.5
Benefits in friction materials: stabilises friction coefficient, lowers wear rate, smooth clean surface
Foreign practice: barite as sole friction modifier at 8–35% (per original article)
Why precipitated grade: solves raw-ore BaSO₄ content fluctuation
Process: barite + coal calcination → BaS leach → react with sodium sulfate → wash / dry / mill
Reported product: BaSO₄ >97%; SG 4.35–4.43; 200 mesh 95% / 325 mesh 85%; whiteness 70%

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.

Precipitated barium sulfate

Abstract

Key facts

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