For benchtop and solid-surface producers, the reformulation race is no longer about marginal silica reduction; it is about proving the finished slab can be fabricated without the respirable crystalline silica hazard that regulators now treat as a product-design flaw. Amorphous recycled glass powder is emerging as the most practical mineral filler for that transition because it replaces quartz flour with a glass-derived phase that is not crystalline silica, while still fitting existing resin-bound mixing and pressing routines.
Regulatory pressure is shifting from exposure control to material elimination.
Australia’s national prohibition on engineered stone benchtops, panels and slabs containing 1% or more crystalline silica took effect 1 July 2024, with an import ban from 1 January 2025. Safe Work Australia’s position was that there is no established safe threshold of crystalline silica in engineered stone, so elimination became the preferred control.
Source: Safe Work Australia
- The ban covers manufacture, supply, processing and installation of silica-containing engineered stone.
- Excluded categories include concrete, ceramic tiles, porcelain and sintered stone without resin binders.
- Fabricators are migrating toward solid surface, silica-free glass-resin composites and low-silica engineered stone.
- EU member states are tightening occupational exposure limits for respirable crystalline silica, reinforcing the same substitution trend.
Amorphous glass powder is not crystalline silica.
The hazard classification turns on atomic structure, not total silica content. Quartz, cristobalite and tridymite are crystalline forms of silica and are classified by IARC as Group 1 carcinogens in the respirable fraction. Amorphous silica has a disordered structure and is IARC Group 3, meaning it is not classifiable as carcinogenic.
Source: Applied Particle Technology
- Recycled glass powder supplied by Hamari is produced from post-consumer and post-industrial glass and is amorphous, not crystalline.
- It can support low-silica engineered stone and crystalline silica replacement claims when tested and documented per lot.
- It can be used alongside recycled glass chips to create terrazzo-style or exposed-aggregate visual effects.
- Formulators should still request current-lot XRD/quantitative phase analysis to satisfy specific market thresholds.
Benchtop reformulation needs a filler that behaves like quartz flour.
Glass powder can replace part or all of the traditional quartz powder fraction in resin-bound engineered stone. Research published in 2024 found that new-generation zero-silica engineered stone benchtop products list recycled glass, aluminium trihydrate and resins as major constituents, with recycled glass accounting for more than 70% of some formulations.
Source: PMC / NIH
- Fine grades such as 325 mesh improve mixing performance, packing density and surface finish.
- Hamari can supply amorphous glass powder in 25 kg bags on an FOB Nansha basis, with TDS and SDS available for qualification.
- Consistent iron content, particle shape and moisture support repeatable slab quality.
- Multiple mesh cuts are available to match binder viscosity, pressing parameters and casting processes.
Solid-surface producers gain a lower-hazard mineral filler route.
Traditional acrylic solid surface already relies on aluminium trihydrate as the main mineral filler and contains no crystalline silica by design. Producers reformulating toward similar silica-free or low-silica profiles can use glass powder for solid surface blends to add recycled content and adjust visual texture without introducing crystalline silica.
Source: CASF / Corian
- Amorphous glass powder can be blended with ATH or other mineral fillers to tune hardness, polish and cost.
- It supports circular-economy claims because the feedstock is diverted post-consumer and post-industrial glass.
- Trial work should hold resin, pigment, pressing and cure conditions constant so the filler change can be isolated.
- Explore Hamari’s recycled glass aggregate product catalog for matching glass chips and beads.
How to qualify amorphous glass powder for your line.
Substitution only works if the new filler meets the same incoming-material controls as quartz. Buyers should build a qualification plan around particle size, phase identity, moisture, contamination and cured-slab performance.
- Request a current COA with PSD method, sieve cut and retained fraction, such as material above 45 μm.
- Ask for quantitative phase analysis if your market requires documented crystalline silica below a specific threshold.
- Run a pilot slab batch comparing dispersion, dry spots, press response and polished appearance against the incumbent filler.
- Contact Hamari’s team through the contact page to discuss target mesh size, volume and destination port.
Buyer FAQ
Does amorphous glass powder contain zero silica?
No. It contains silicon dioxide in an amorphous, non-crystalline structure. The regulatory and health concern is respirable crystalline silica, which amorphous glass powder is not. Always verify with current-lot testing for your market.
What mesh size is typical for engineered-stone filler?
Fine grades such as 325 mesh are commonly used as a quartz-flour replacement. Hamari offers multiple mesh cuts and can advise on the right grade for your binder system and surface finish.
Can I use glass powder in solid-surface formulations?
Yes. Glass powder for solid surface can be blended with ATH or other mineral fillers to adjust texture, recycled content and appearance while avoiding crystalline silica.
What documentation does Hamari provide?
Hamari supplies technical data sheets, SDS and samples for reformulation projects. Products are offered in 25 kg bags on FOB Nansha terms. Send your target specification to info@hamari.cn.
Ready to reformulate? Email info@hamari.cn with your target mesh size, volume and destination port. Hamari will quote FOB Nansha and provide TDS, SDS and trial samples of amorphous recycled glass powder for your engineered-stone or solid-surface line.
Does amorphous glass powder contain zero silica?
No. It contains silicon dioxide in an amorphous, non-crystalline structure. The regulatory and health concern is respirable crystalline silica, which amorphous glass powder is not. Always verify with current-lot testing for your market.
What mesh size is typical for engineered-stone filler?
Fine grades such as 325 mesh are commonly used as a quartz-flour replacement. Hamari offers multiple mesh cuts and can advise on the right grade for your binder system and surface finish.
Can I use glass powder in solid-surface formulations?
Yes. Glass powder for solid surface can be blended with ATH or other mineral fillers to adjust texture, recycled content and appearance while avoiding crystalline silica.
What documentation does Hamari provide?
Hamari supplies technical data sheets, SDS and samples for reformulation projects. Products are offered in 25 kg bags on FOB Nansha terms. Send your target specification to info@hamari.cn.
Sources & Original Articles（来源 · 点击原文）
- 阅读原文：Safe Work Australia — Engineered stone prohibition (2024). Australia’s national ban on engineered stone containing 1% or more crystalline silica.
- 阅读原文：Applied Particle Technology — Crystalline vs Amorphous Silica: Why It Matters (n.d.). Explains structural and toxicological distinction between crystalline and amorphous silica.
- 阅读原文：PMC / NIH — Engineered Stone and Silicosis: The Unfinished Product (2024). Documents that zero-silica engineered stone products use recycled glass as a major constituent.
- 阅读原文：CASF / Corian — Zero Silica Solid Surface Benchtops (n.d.). Confirms solid surface contains no crystalline silica by design and is unaffected by the engineered-stone ban.