Borax, Powdered 10 Mole
SKU: 72306-1LB Brand: Seattle Pottery Supply
$6.22
| SKU | Size | INVENTORY | ORDER ELIGIBILITY | PRICE | 
|---|---|---|---|---|
| 72306-1LB | 1# Bag | 2 in stock | While supplies last | $6.22 | 
| 72306-10LB | 10# Bag | Out of Stock | Please call | $37.98 | 
| 72306-25LB | 25# Bag | Out of Stock | Please call | $81.81 | 
| 72306-5LB | 5# Bag | 3 in stock | While supplies last | $23.23 | 
| 72306-50LB | 50# Bag | 5 in stock | While supplies last | $146.00 | 
*Back orders will be placed for order quantities exceeding that of on-hand inventory.
The “10 mole” in Borax, Powdered 10 Mole refers to Borax Decahydrate—its chemical formula is Na₂B₄O₇·10H₂O.
This means each unit of sodium tetraborate contains ten moles of chemically bound water (water of crystallization).
That water content affects how the material behaves in ceramics:
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Flux behavior: When heated, the ten water molecules are released between 150–300 °C, causing Borax to puff and lose weight before it melts and begins to flux.
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Handling differences: Because of its water content, 10-mole borax is bulkier and less concentrated in boron than anhydrous (0-mole) or pentahydrate (5-mole) forms, so glaze recipes using different borax types must adjust by weight.
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Storage: The decahydrate can lose water over time if exposed to air, altering its weight and chemistry slightly, so it’s best stored sealed and dry.
 
Dust can irritate the eyes, skin, and respiratory system. Always wear gloves, a dust mask or respirator, and work in a well-ventilated area. Avoid ingestion and wash hands thoroughly after handling.
Learn more about Borax Decahydrate on DigitalFire.com.