murphySodium Borate
AKA: 1303-96-4, BORAX, Borax (B4Na2O7.10H2O), Sodium borate decahydrate, Sodium pyroborate decahydrate, Antipyonin, Borascu, Boricin, Solubor, Tronabor
Synthetic
Not Clean
OriginSodium borate is synthesized from boron minerals, typically borax or boric acid, derived from naturally occurring boron deposits. It is produced through neutralization of boric acid with sodium hydroxide or sodium carbonate solution.
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
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
No
Functions
Buffering
Stabilizes pH
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used · CIR tentative re-review report (2026)
Pregnancy
No
CIR Safety Findings
Not a Sensitizer
8 studies / 8 not sensitizing (CIR 215 and 912)
Not Phototoxic
Product formulation test found no phototoxicity in the CIR safety assessment (CIR 215 and 912)
Mixed Eye Irritation Results
4 studies / 2 irritating / 1 mixed / 1 not irritating / reactions slight (CIR 215 and 912)
Mixed Skin Irritation Results
14 studies / 4 irritating / 1 mixed / 9 not irritating / reactions minimal to moderate (CIR 215 and 912)
Dermal Absorption 0.21%
human in vivo (n=8) / 5% aq solution / 900 cm2 area / 24 h (CIR 912)
Concentration Guide
Leave-onNot reported
Rinse-off0.0019–3.7%
0%50%100%
CIR reported use · 2025 survey
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR