Sodium Borate
AKA “1303-96-4, BORAX, Borax (B4Na2O7.10H2O), Sodium borate decahydrate, Sodium pyroborate decahydrate, Antipyonin, Borascu, Boricin, Solubor, Tronabor
Ingredient
Ingredient Facts
Sodium borate
AKA: 1303-96-4, BORAX, Borax (B4Na2O7.10H2O), Sodium borate decahydrate, Sodium pyroborate decahydrate, Antipyonin, Borascu, Boricin, Solubor, Tronabor
Ingredient · Buffering · EWG: 4
Synthetic
Not Clean
Disodium tetraborate, anhydrous (boric acid, disodium salt); Disodium tetraborate decahydrate (borax decahydrate)
Solubility Aqueous solution is alkaline to litmus and phenolphthalein; pH about pH = 9.5
Formula
B4H20Na2O17
Mol. Weight
381.40
CAS #
1330-43-4, 1303-96-4
Form
Powder
State
Dry Powder; Other Solid; NKRA; Pellets or Large Crystals
See origin →
Functions
Buffering
Stabilizes pH
Traditional Use
Borax (sodium borate) has been used for centuries in traditional medicine and beauty preparations as an antimicrobial and pH buffer. Historically used to soften water and preserve cosmetic formulations before modern preservative systems were developed.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
No
EWG
4
CIR
Safe as used
Pregnancy
No
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUpermitted
JAPANpermitted
CANADApermitted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR