Engineered stone is being reformulated because respirable crystalline silica is now restricted or banned in major markets.
Australia and the European Union have moved decisively to limit worker exposure to respirable crystalline silica from engineered stone benchtops. Manufacturers that rely on quartz-rich formulations must now source compliant fillers or exit those markets.
- Australia’s national ban on the use, supply, manufacture and installation of engineered stone containing >1% crystalline silica took effect on 1 July 2024.
- The European Commission has proposed an amendment to Directive 2009/148/EC that would set a binding occupational exposure limit for respirable crystalline silica at 0.05 mg/m³ TWA across the EU.
- Spain’s occupational exposure limit for respirable crystalline silica is already set at 0.05 mg/m³ TWA, matching current EU Best Practice guidance.
- Buyer action: benchtop and solid-surface producers selling into Australia or the EU should audit formulations now and map crystalline-silica-free filler options.
Source: Safe Work Australia – Model WHS Regulations for Engineered Stone
Source: European Parliament – Stricter Rules on Crystalline Silica Exposure
Source: Instituto Nacional de Seguridad y Salud en el Trabajo (INSST) – Sílice cristalina
Amorphous glass powder is chemically different from crystalline silica and is not classified as a carcinogen.
The disordered, non-crystalline structure of amorphous glass powder means it does not produce the respirable crystalline silica dust linked to silicosis and lung cancer. This makes it a practical crystalline silica replacement in polymer-bonded composites.
- Crystalline silica has an ordered lattice (quartz, cristobalite, tridymite) and is classified by IARC as a Group 1 carcinogen when inhaled occupationally.
- Amorphous silica / glass powder has a random atomic structure; IARC classifies synthetic amorphous silica as Group 3 (not classifiable as to carcinogenicity).
- Australia’s workplace exposure standard for respirable crystalline silica is 0.05 mg/m³ TWA; no equivalent WES applies to amorphous glass powder.
- Buyer action: specify amorphous rather than crystalline silica-based fillers in raw-material agreements and SDS reviews.
Source: BSiO₂ – Amorphous vs Crystalline Silica
Source: Caragreen – What Surfaces Are Crystalline Silica Free?
Reduced-silica and zero-silica engineered stone formulations already use recycled glass as the main mineral filler.
Leading low-silica engineered stone products now contain up to 90% recycled glass, with aluminium trihydrate and resin making up the balance. Recycled glass filler is therefore proven in market-ready benchtop formulations.
- Reduced-silica engineered stone typically contains <10–50% crystalline silica, with up to 90% recycled content, often recycled glass.
- Zero-silica / crystalline-silica-free products list recycled glass, aluminium trihydrate and organic fillers as major constituents.
- Recycled glass countertops and solid-surface materials do not carry the same respirable crystalline silica risks during fabrication or installation.
- Buyer action: ask suppliers for particle-size distributions, mesh grades and resin-compatibility data for recycled glass filler.
Source: PMC – Engineered Stone and Silicosis: The Unfinished Product
Hamari supplies graded recycled glass fillers and glass granules suitable for engineered-stone and terrazzo applications.
Glass powder for solid surface and engineered stone works as a functional mineral filler, not just a colour aggregate.
Fine amorphous glass powder can replace quartz flour as the inert mineral filler in polyester and acrylic solid-surface matrices. It contributes brightness, hardness and chemical resistance without adding crystalline silica.
- Mesh sizes from 80 mesh to 325 mesh are common for solid-surface fillers; finer grades improve surface polish and resin wet-out.
- Clear and mirror glass powders give a neutral white / translucent brightness; coloured glass powders can be blended for decorative effects.
- Amorphous glass powder is chemically compatible with acrylic, polyester and epoxy binders used in solid-surface and engineered-stone production.
- Buyer action: run side-by-side casting trials comparing viscosity, cure time, flexural strength and water absorption against your current quartz filler.
Explore Hamari’s glass sand and glass beads ranges for compatible aggregate and powder grades.
Hamari’s amorphous recycled glass powder gives formulators a low-silica, ready-to-test alternative.
Hamari produces amorphous recycled glass powder from post-consumer and post-industrial glass, sized for mineral-filler applications. We can supply technical data sheets, SDS and samples for reformulation projects.
- Recycled glass feedstock is amorphous, so it supports low-silica engineered stone and crystalline silica replacement claims when tested and documented.
- Multiple mesh cuts are available to match your binder system, pressing process or casting viscosity.
- Consistency in iron content, particle shape and moisture supports reproducible slab quality.
- Buyer action: email info@hamari.cn with your target mesh size, volume and destination port; we quote FOB Nansha and provide TDS/SDS.
Need a silica-free aggregate option? See Hamari tumbled glass blocks for larger decorative inclusions.
Reformulating for Australia, the EU or other silica-restricted markets? Contact Hamari at info@hamari.cn to request a TDS, SDS and trial sample of amorphous recycled glass powder. We ship from our South China plant on FOB Nansha terms and can advise on the right mesh grade for your engineered-stone or solid-surface line.
Is amorphous glass powder the same as crystalline silica?
No. Amorphous glass powder has a random, non-crystalline atomic structure. Crystalline silica (quartz, cristobalite, tridymite) has an ordered lattice and is classified as a human carcinogen when respirable particles are inhaled occupationally. Amorphous glass powder is not classified as a carcinogen and is therefore used as a crystalline silica replacement in low-silica engineered stone.
Can glass powder for solid surface replace quartz flour?
Yes. Fine amorphous glass powder can act as a mineral filler in acrylic, polyester and epoxy solid-surface formulations. It provides brightness, hardness and chemical resistance without introducing crystalline silica. Producers should run casting trials to match viscosity, cure behaviour and mechanical properties to their existing quartz-based recipe.
What mesh sizes are typical for recycled glass filler in engineered stone?
Engineered-stone and solid-surface producers commonly use recycled glass filler from 80 mesh to 325 mesh. Coarser grades add texture; finer grades improve polish and resin wet-out. Hamari can supply multiple mesh cuts and provide sieve analysis on request.
Does using recycled glass filler make a product silica-free?
Recycled glass is amorphous silica, not crystalline silica, so it does not count toward respirable crystalline silica exposure limits in most regulations. However, final product claims such as ‘silica-free’ or ‘low-silica engineered stone’ must be supported by third-party testing and the specific regulatory definitions of the destination market.
How do I get samples and technical documents from Hamari?
Email info@hamari.cn with your target mesh size, estimated volume and destination port. Hamari will reply with a TDS, SDS, sample arrangement and FOB Nansha quotation.
Sources & Original Articles（来源 · 点击原文）
- 阅读原文：Safe Work Australia — Model Work Health and Safety Regulations for Engineered Stone (2024). Sets out Australia’s 1 July 2024 ban on engineered stone containing >1% crystalline silica.
- 阅读原文：European Parliament — EU Parliament backs stricter rules on crystalline silica exposure (2024). Reports EU agreement to tighten occupational exposure limits for respirable crystalline silica.
- 阅读原文：INSST — Sílice cristalina (2024). Spanish occupational health institute guidance on crystalline silica exposure limits and controls.
- 阅读原文：BSiO₂ — Amorphous vs Crystalline Silica (2024). Explains the structural and regulatory distinction between amorphous and crystalline silica.
- 阅读原文：PMC / NCBI — Engineered Stone and Silicosis: The Unfinished Product (2024). Peer-reviewed summary of reduced-silica and zero-silica engineered stone formulations using recycled glass.
- 阅读原文：Caragreen — What Surfaces Are Crystalline Silica Free? (2024). Industry blog noting recycled glass and solid surface as low- or no-crystalline-silica alternatives.