Anhydrous Borax (Sodium Tetraborate ≥98%)

Anhydrous borax is water-free sodium tetraborate (Na₂B₄O₇) used as a concentrated borate source and flux in glass, ceramics, metallurgy and high-temperature industrial formulations. For buyers comparing chemistry, hydration state and industrial uses, see our anhydrous borax definition and chemistry guide.

Anhydrous Borax Specifications (≥98% Na₂B₄O₇)

Item	Specification
Product Name	Anhydrous Borax / Sodium Tetraborate Anhydrous
Chemical Formula	Na₂B₄O₇
CAS No.	1330-43-4
Purity	≥98%
Appearance	White crystalline granules
Particle Size	40–60 mesh
HS Code	2840110000
Documents	Batch documents available upon confirmed inquiry / order requirements

How Anhydrous Borax Works as a Metallurgical Flux

YuXing anhydrous borax (sodium tetraborate, Na₂B₄O₇ ≥98%) is used as a metallurgical flux in smelting, refining and alloy production. During high-temperature processing, it helps lower the effective melting temperature, dissolve metal oxides and form a fluid slag layer that separates impurities from the molten metal.

For industrial buyers, the practical value is process stability. A consistent 40–60 mesh granular form supports easier dosing and mixing, while controlled purity helps reduce variation between batches in furnace, glass and ceramic applications.

Anhydrous Borax vs Borax Decahydrate vs Borax Pentahydrate

Type	Typical Formula	Key Difference	When to Choose
Anhydrous Borax	Na₂B₄O₇	No crystal water, higher active borate content per kg	High-temperature glass, ceramics, metallurgy and flux processes where water release should be minimized
Borax Pentahydrate	Na₂B₄O₇·5H₂O	Contains moderate crystal water	General glass, ceramic frits, detergents and industrial formulations where moderate water content is acceptable
Borax Decahydrate	Na₂B₄O₇·10H₂O	Contains higher crystal water and lower active content per kg	Cleaning products, detergents and selected lower-temperature applications

If your process is weight-sensitive or high-temperature, anhydrous borax is often preferred because it delivers more active borate per shipment and avoids extra water release during heating. Final selection should still match your furnace design, formulation, moisture tolerance and cost calculation based on active borate content rather than price per ton only.

Applications by Industry

Metallurgy and Smelting Flux

Anhydrous borax is used as a flux for melting, refining and oxide removal in metal processing. Buyers should confirm purity, particle size, moisture sensitivity and packaging before bulk purchase, especially when the material will be added directly to furnace or smelting operations.

Glass, Borosilicate and Fiberglass

In glass manufacturing, anhydrous borax provides borate content without extra crystal water. It can help support melting behavior, thermal shock resistance and chemical durability in borosilicate, optical, specialty glass and fiberglass formulations.

Ceramics, Glazes and Enamel

For ceramic glazes and enamel systems, anhydrous borax helps control melting behavior and surface finish. Procurement teams should match the grade with glaze formulation, firing temperature, particle size requirements and storage conditions.

• Brazing and soldering: used as a fluxing aid where oxide control and surface wetting are required.
• Industrial formulations: used as a buffer, corrosion inhibitor or borate source depending on formulation requirements.

Packaging & Export Support

YuXing supplies anhydrous borax with export packaging arranged according to order quantity, destination and handling requirements. Technical and batch documents can be provided after product grade, batch and order requirements are confirmed.

• Packaging: 25 kg bags, jumbo bags, palletizing or container loading based on order requirements.
• Batch documents: specification, safety and quality documents can be issued according to confirmed grade, batch and destination requirements.
• Export support: invoice, packing list and shipment documents based on order requirements.

Why Choose YuXing Na₂B₄O₇

1. High purity (≥98%) with controlled impurities for consistent metallurgical, glass and ceramic performance.

2. Uniform 40–60 mesh white crystalline granules for practical dosing, mixing and industrial handling.

3. Export packaging, shipment coordination and batch document support for international buyers after inquiry confirmation.

Frequently Asked Questions

What is anhydrous borax?

Anhydrous borax is water-free sodium tetraborate with the formula Na₂B₄O₇. It contains no water of crystallization and is often used where higher active borate content and lower moisture input are required.

Is anhydrous borax the same as sodium tetraborate?

Yes. Anhydrous borax is commonly referred to as sodium tetraborate anhydrous or disodium tetraborate. Buyers should still confirm the exact grade, purity, particle size and intended application before ordering.

What is anhydrous borax used for?

Anhydrous borax is used as a flux in metallurgy, glass and ceramics, and as a brazing aid, corrosion inhibitor and industrial buffer. In smelting and refining, it helps lower melting points and remove metal oxides.

What is the difference between anhydrous borax and borax decahydrate?

Anhydrous borax contains no water of crystallization, while borax decahydrate contains crystal water. The anhydrous form provides higher active borate content per kg and is often preferred for high-temperature industrial processes.

What purity does industrial anhydrous borax require?

Industrial and metallurgical applications commonly use Na₂B₄O₇ ≥98%. For final procurement, confirm the specification and batch quality document according to your application and destination requirements.

What is the HS code for anhydrous borax?

The export HS code is commonly 2840110000 for disodium tetraborate / sodium tetraborate anhydrous. Final customs classification should be confirmed according to product grade, destination and shipping documents.

What particle size is available?

YuXing supplies anhydrous borax as white crystalline granules with 40–60 mesh particle size, suitable for industrial dosing and furnace addition. Other particle size requirements can be discussed according to order quantity and application.

How should anhydrous borax be stored?

Store anhydrous borax in a dry, ventilated warehouse and keep packaging sealed. Because it can absorb moisture, avoid long exposure to humid air before industrial use.

How can I get an anhydrous borax quotation?

Submit your required quantity, destination port, packaging preference and application details through the contact page. YuXing will provide a formal quotation and confirm available technical documents according to the requested grade and order requirements.

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Request a Quote

If you need anhydrous borax ≥98% for metallurgy, glass, ceramics or industrial flux applications, contact YuXing with your required quantity, particle size, destination port and packaging requirements. Our team will provide a quotation, export packaging suggestions and batch document support according to the confirmed order.

Product Information Notice

• The values shown are typical reference information and are not a guaranteed sales specification. Final specifications are subject to the confirmed product, grade and batch COA.
• Packaging, transport method and hazard classification must be confirmed according to product grade, order quantity, destination regulations, shipping route and the current SDS.
• TDS, SDS/MSDS and COA files are provided according to product, batch and destination requirements. Public documents should not be treated as final delivery documents unless issued for the current batch.
• This page is for procurement discussion and technical selection reference only. It does not replace safety, regulatory, process design or site operating advice. Users must follow local regulations and the latest SDS.