What's your minimum order quantity (MOQ) for White Rice Husk Ash?

MOQ varies by packaging format — bulk shipments typically run higher volume, bagged orders can start smaller. Confirm current MOQ when you request a quote.

Can I get a White Rice Husk Ash sample before ordering?

Yes — sample requests can be submitted through the contact form by selecting Sample request as the inquiry type.

Do you provide a Certificate of Analysis with every WRHA shipment?

Yes — each shipment ships with its own COA. SiO2 purity is currently Sucofindo-verified at 96%, with additional parameters being finalized.

White Rice Husk Ash Silica — Medan, Indonesia

The high-silica (SiO₂) standard in rice husk ash silica.

Fortuna Commodities produces and exports White Rice Husk Ash (WRHA) verified at 95–96% SiO2 purity across two independent labs — graded, tested, and shipped for buyers who read color as a purity signal, not an aesthetic.

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Freshly graded paper-white WRHA

Whiteness and purity index

COLOR GRADE CORRELATES WITH SiO2 CONTENT

96% SiO2 — Fortuna paper-white

Drag to explore the whiteness-to-purity relationship

GREY ASH Uncontrolled combustion, residual carbon

STANDARD WHITE Commercial grade, inconsistent batches

          FORTUNA PAPER-WHITE
          95–96% SiO2, dual-lab verified, controlled burn
        

Consistent focus on quality

We focus consistently on the quality of high-purity silica in rice husk ash.

Fortuna has concentrated on one material and one standard: White Rice Husk Ash with consistently high silica purity. Every batch is graded and tested against that standard before it ships.

That narrowing is deliberate. Buyers sourcing WRHA for refractory, rubber, and construction applications aren't shopping on price alone; instead, they're grading incoming batches by color and SiO2 consistency before they even test them. A supplier who treats WRHA as one line among many can't hold that consistency shipment after shipment. We can, because it's the only thing we produce.

The team behind Fortuna brings 15+ years of rice husk ash export experience. PT Fortuna Lancar Sejahtera itself was formally incorporated in 2024.

What that means for you

01Combustion is controlled specifically for whiteness, not just yield
02Every batch is graded before it's queued for shipment
03One production line means fewer variables between orders
04Direct export access via our Belawan Port warehouse

Specification

What you're actually buying

Our paper-white WRHA grade is characterized across five lab parameters: XRF, XRD, LOI, Whiteness, and PSA. SiO2 purity, LOI, and particle size are confirmed; XRD and Whiteness Index are pending additional lab testing.

Parameter

Status

Notes

XRF — SiO2 Content

95–96%

Dual-verified: 96% by Sucofindo (KAN-accredited), 95.12% by tekMIRA (KAN-accredited); both figures are confirmed

XRD — Crystalline Phase

Pending

X-Ray Diffraction analysis in progress

LOI — Loss on Ignition

0.76%

Confirmed by tekMIRA — low unburned carbon

Whiteness Index

Pending (visually paper-white)

Formal index pending; visually graded paper-white before packing

PSA — Particle Size

D50: 175.7 µm

Confirmed by tekMIRA — D10 36 / D50 176 / D90 483 µm, laser diffraction

→SiO2 purity is dual-verified by Sucofindo and tekMIRA, with LOI and particle size also confirmed by tekMIRA. XRD and Whiteness Index results are pending — request the current specification sheet for the latest status.

Preview specification sheet

Process

From husk to graded silica

Four stages, each built around one goal: keeping the ash white.

01 / SOURCING

Regional husk collection

Rice husk is sourced from mills across North Sumatra, close enough to Medan to control handling before combustion.

02 / COMBUSTION

Controlled burn

Temperature and airflow are managed through the burn — the difference between a grey, carbon-streaked ash and a clean paper-white one. Moisture is also controlled at this stage, confirmed by tekMIRA at ≤0.5%.

03 / GRADING

Sieving for color and consistency

Batch quality control

Each batch is checked for color consistency and SiO2 content before it's approved for packing.

04 / EXPORT

Packed and ready for export

Packing and shipment

Stored at our warehouse near Belawan Port and shipped directly to buyers across APAC and beyond.

Applications

Where paper-white WRHA is used

Molten steel over RHA lining (Best Usage)

Industrial

Refractory and tundish covering

High-SiO2 ash used as an insulating covering compound in steelmaking tundish applications, where consistent color grading correlates with consistent thermal performance.

Sprinkled over molten metal surfaces, WRHA's low thermal conductivity and high refractoriness help insulate the melt and slow heat loss during casting, while its fine, consistent particle size reduces steel inclusions. Buyers in this application care most about consistent whiteness and SiO2 purity from batch to batch.

Tire tread, rubber compounding

Materials

Rubber and elastomers

Silica-rich ash used as a reinforcing filler in rubber compounding, as an alternative feedstock for manufacturers looking to diversify away from mined silica.

As a reinforcing filler, WRHA's high surface area and amorphous silica content function alongside or in place of mined silica in compound mixing, contributing to tensile strength and wear resistance. Particle consistency and low moisture content matter most for even blending.

Cement and precast concrete

Construction

Cement and construction

A pozzolanic additive contributing to strength and durability in cementitious blends, with growing interest from buyers pursuing lower-carbon concrete formulations.

As a pozzolanic material, WRHA reacts with calcium hydroxide released during cement hydration to form additional binding compounds, which can improve density and resistance to chemical attack. Increasingly relevant for buyers specifically targeting lower-carbon concrete formulations that reduce clinker content.

Ceramic ware and glass

Manufacturing

Ceramics and glass

A silica source for specialty ceramic and glass formulations where visible color purity, not just chemical assay, determines whether a batch is usable.

Low iron and carbon content is what buyers screen for here; it's what keeps a ceramic or glass melt from picking up unwanted color. Every batch is visually graded for whiteness before packing, on top of the lab-confirmed SiO2 purity.

Common thread: in every application above, the buyer is ultimately purchasing consistency of SiO2 content and color — the two things our controlled-burn and batch-grading process is built to protect.

Downstream potential

Where paper-white WRHA can go next

Beyond raw ash supply, we're actively developing the value chain that turns WRHA into higher-value silica derivatives. These are R&D and feasibility-stage initiatives, not yet commercial product lines, flagged here for buyers and partners interested in co-developing further upstream.

Feasibility stage

Sodium silicate

Processing WRHA into sodium silicate solution, a precursor used in adhesives, detergents, and precipitated silica manufacturing.

Feasibility stage

Precipitated silica

A higher-value, higher-purity downstream product with applications in tires, coatings, and specialty rubber, which is the next tier up from raw WRHA.

Early research

Silicon carbide precursor

Exploratory work on rice husk-derived silica as a feedstock route toward silicon carbide, relevant to semiconductor and abrasive markets.

Quality and logistics

Built for buyers who verify before they buy

The infrastructure behind the whiteness claim.

Independent lab verification

SiO2 purity is independently verified by two labs, both KAN-accredited under ISO/IEC 17025: Sucofindo, one of Indonesia's national inspection bodies, and tekMIRA, a government mineral and coal testing institute under Indonesia's Ministry of Energy and Mineral Resources, KAN-accredited since 1999. Together they confirm 95–96% purity, with LOI and particle size also confirmed by tekMIRA.

Port-adjacent warehousing

Our warehouse sits near Belawan Port, shortening the gap between grading and loading.

Consistent shipping cadence

20+ shipments a year to APAC-majority destinations, with export experience across other international markets.

Common questions

Before you request a quote

Minimum order quantity is 25 tonnes (1 x 40ft container) for bulk shipments. Bagged orders can be discussed at smaller volumes. Please confirm when you request a quote.

We typically ship FOB Belawan Port; other Incoterms can be arranged depending on destination and volume.

Lead time depends on the current production queue and packaging format — please ask for a current estimate when you submit an inquiry.

Yes — sample requests can be submitted through the contact form; select "Sample request" as the inquiry type.

Payment terms are discussed per order based on volume and destination — kindly reach out for current terms.

Yes — each shipment ships with its own COA. SiO2 purity is currently verified at 95–96% across two independent labs, with LOI and particle size also confirmed; remaining parameters are being finalized.

The high-silica (SiO₂) standard in rice husk ash silica.

Whiteness and purity index

We focus consistently on the quality of high-purity silica in rice husk ash.

What you're actually buying

From husk to graded silica

Regional husk collection

Controlled burn

Batch quality control

Packing and shipment

Tell us what you're using WRHA for

Where paper-white WRHA is used

Refractory and tundish covering

Rubber and elastomers

Cement and construction

Ceramics and glass

Where paper-white WRHA can go next

Sodium silicate

Precipitated silica

Silicon carbide precursor

Built for buyers who verify before they buy

Independent lab verification

Port-adjacent warehousing

Consistent shipping cadence

Before you request a quote

Ready to talk about your next shipment?

Request a specification sheet or a quote

The high-silica (SiO2) standard in rice husk ash silica.

Whiteness and purity index

We focus consistently on the quality of high-purity silica in rice husk ash.

What you're actually buying

From husk to graded silica

Regional husk collection

Controlled burn

Batch quality control

Packing and shipment

Tell us what you're using WRHA for

Where paper-white WRHA is used

Refractory and tundish covering

Rubber and elastomers

Cement and construction

Ceramics and glass

Where paper-white WRHA can go next

Sodium silicate

Precipitated silica

Silicon carbide precursor

Built for buyers who verify before they buy

Independent lab verification

Port-adjacent warehousing

Consistent shipping cadence

Before you request a quote

Ready to talk about your next shipment?

Request a specification sheet or a quote

Specification Sheet — Preview

The high-silica (SiO₂) standard in rice husk ash silica.