- Chinese Trustworthy Manufacture of Silica Fume
Collected straight from our furnace baghouse with zero compaction — every spherical particle stays fully dispersed, so you get the highest pozzolanic activity of any silica fume type. Bulk density 250-350 kg/m³, SiO₂ 85%-99.9%, all grades ASTM C1240 compliant and shipped from stock. Compared with densified silica fume, it is lighter and more reactive. Choose from 85U, 90U, 92U, 94U, 95U, 96U and 99.9% Undensified Silica Fume.
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0.15–0.20 μm
Average particle size
(smaller than cement)
250–350 kg/m³
Bulk density
as-produced, unground
≥105 %
7-day activity index
(94U grade, ASTM C1240)
7 days
Ex-stock lead time
Qingdao / Xingang
250-350
kg/m³ BULK DENSITY
Undensified — free-flowing spheres
Density 250-350 kg/m³ — incredibly light and highly active. Instant wetting and dispersion, no extra mixing time, but needs larger storage space.
Densified — cemented agglomerates
Encrypted by densifying equipment for a higher bulk density — compact to ship and store.
Collected straight from the submerged electric furnace — no densifying equipment, no grinding. What leaves the smelter is exactly what ships to you.
250-350 kg/m³ as-produced densitySmall particles that disperse easily — no cemented agglomerates to break down in the mixer, so there is basically no need to increase concrete mixing time.
No added mixing timeAverage particle size 0.15–0.20 μm fills the voids between cement particles, making the slurry denser — impermeability rises 5-18 times, chemical resistance more than 4 times.
Denser paste, higher compressive strengthAs-produced fume is visibly lighter than densified silica fume, so it will not deepen the colour of your concrete.
Will not darken architectural concreteThe industry benchmark grade. High reactivity and low LOI help drive early strength while keeping colour consistent for architectural and fair-faced mixes.
Higher silica content produces a denser C-S-H matrix. The resulting drop in permeability helps protect rebar in ports, jetties and offshore decks.
Free-flowing spheres improve pumpability and reduce rebound. A practical cost-to-reactivity balance for tunnel campaigns.
Low impurities keep performance stable above 1,600 °C. Silica fume promotes mullite formation in low-cement castables for steel ladles and kiln linings.
High-purity grade for API / ISO 10426-1 slurries. Helps control fluid loss and gas migration in HPHT wells, with COA available per lot.
Not sure which dose fits your mix design?
Tell us the target strength, cement type and admixture system — our engineer returns a starting mix proportion, free.
Five flexible packing solutions — from palletized 25kg bags to 1000kg jumbo bags — all engineered for safe container shipping and easy site handling.
25kg soluble paper bags, 42 per pallet — space-saving, forklift-friendly and fast to load into containers.
Pallets secured with stretch film for safe loading, unloading and long-distance ocean shipping.
25kg moisture-proof kraft paper bags with inner PE liner — easy to carry, ideal for construction sites.
500–1000kg plastic woven bags, 2 per pallet, with or without bottom discharge spout — built for bulk handling.
Your own logo, bag design and marking — professional OEM service to build your brand worldwide.
Call Us
+86 13109355617Email Address
ewende@microsilica-si.comPractical answers about freight, dosing, dust control and custom grades.
If your application needs peak reactivity — high-strength, grouting, refractory — stay undensified and recover the freight in cement savings: silica fume typically replaces 3–5× its weight in cement. If freight dominates your landed cost, ask us for semi-densified 350–450 kg/m³ or a split container.
Yes — 350–450 kg/m³, produced by mechanical aeration rather than compression, which preserves about 90% of particle dispersion. Popular on Middle East and Southeast Asia routes where freight per m³ is high.
Three proven routes: manual bag-rip dosing at smaller plants; big-bag discharge stations with vibrating frames; or a day silo with screw feeder for continuous lines. We share layout drawings from customer plants on request.
Bags use anti-static inner PE liners, and our TDS includes a low-dust rip-and-pour procedure. For sensitive environments, ask about the low-dust bag variant — lightly surface-treated, identical chemistry.
More questions? Send us your specs and our engineer will reply within 24 hours.
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One form, twelve grades. A sales engineer replies with the full FOB price list + freight to your port — or just the grades you mark.
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