murphyMethylpropanediol
AKA: 2-Methyl-1, 3-propanediol, 2163-42-0, 1, 3-Propanediol, .BETA.-HYDROXYISOBUTANOL, HSDB 7267, MP Diol, 3Propanediol, 2methyl
Everyday Radiance Essentials
Bloom Effects
holi (sun) spf 50 dewy tinted skin drops
Agent Nateur
holi (soleil) firming & plumping mineral spf 50 sunscreen
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Super Serum Skin Tint SPF 30
ILIA Beauty
lactic acid cleanser duo
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Radiance Reset
Bloom Effects
Refreshing Water Mist
COOLA
SunCoverup Super Tint SPF 50
RMS Beauty
Super Serum Skin Tint SPF 40
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The ILIA Look
ILIA Beauty
Daily SPF 50 Primer
Indie Lee
SunCoverup Super Tint Broad Spectrum SPF 50 Sunscreen
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Supernatural Radiance Serum Broad Spectrum SPF 30 Sunscreen
RMS Beauty
Tulipscreen™ Hydrating Lip Oil
Bloom Effects
Sunlit Essentials Set
Indie Lee
the after (glow) set: rose quartz
Agent Nateur
the after (glow) set: ruby
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the body duo
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the vitamin c and hyaluronic brightening duo
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Tulip Dew Sunscreen Serum
Bloom Effects
Synthetic
Humectant
Solvent
Synthetic
Clean
OriginSynthesized from propylene oxide and water through a multi-step chemical process involving ring-opening reactions. Produced via catalytic hydrogenation and condensation to yield the final diol compound.
See also: Glycerin; methylpropanediol (component of).
Solubility In water, greater than or equal to 3000 mg/L at 25 °C
Formula
C4H10O2
Mol. Weight
90.12
CAS #
2163-42-0
Form
Liquid
State
Liquid
Skin Types
●all-skin-types
Best For
General
Functions
Humectant
A moisture magnet. Pulls water from the air and deeper skin layers up to the surface to keep skin plump and hydrated.
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Dissolves Ingredients
Dissolves other ingredients
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Insufficient
Pregnancy
—
CIR Safety Findings
Not an Eye Irritant
1 study / 1 not irritating (CIR 731)
Mixed Skin Irritation Results
3 studies / 1 irritating / 2 not irritating (CIR 731)
Mixed Sensitization Results
4 studies / 2 sensitizing / 2 not sensitizing (CIR 731)
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR