Is Glycereth-18 a single compound with a fixed molecular formula?

No. Glycereth-18 is a glycerol ethoxylate distribution with an average ethylene-oxide addition level. It is not one discrete molecule. Product comparison should therefore use the agreed distribution-related and performance-relevant controls, rather than a generic molecular formula or one purity number.

Can one Glycereth-18 grade be substituted for another by the same weight?

Not automatically. Products with the same nominal Glycereth-18 designation can differ in ethoxylation distribution, hydroxyl value, water and viscosity. These differences can affect formulation behaviour. Any replacement should be checked against the agreed specification and in the intended finished system.

Glycerol Ethoxylate G-18 / Glycereth-18 CAS 31694-55-0

Glycerol Ethoxylate G-18 / Glycereth-18 (CAS 31694-55-0) is a three-arm polyethylene-glycol ether of glycerol with a nominal average total of about 18 ethylene-oxide units. Glycereth-18 is the INCI name; the material is a polymer distribution and has no single fixed molecular formula. EC/List 500-075-4 is not assigned here because the ECHA entry covers a lower EO range; verify the offered grade's regulatory identity in supplier documentation. It is evaluated as a water-compatible polyether, humectant and formulation aid in personal-care and industrial systems. Confirm nominal EO distribution, hydroxyl value, water, viscosity, color, active matter, physical form, intended standard and packaging for the offered grade.

CAS: 31694-55-0
Synonyms: Glycereth-18; Glycerol ethoxylate G-18; Ethoxylated glycerol; Glycerin ethoxylate; Polyoxyethylene glyceryl ether
Einecs: Not specified for the Glycereth-18 grade; verify the supplier's EC/List identity
Molecular Formula: Three-arm glycerol polyether with nominal x+y+z about 18 EO; variable distribution with no single molecular formula
Grade: Confirm nominal EO distribution, hydroxyl value, water, viscosity, color, active matter and physical form
Package: Confirm current packaging, net weight, moisture protection and destination requirements

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Product Description

1 Product overview

2 Technical information

3 Handling and documentation

Product overview

Glycerol Ethoxylate G-18 (Glycereth-18, CAS 31694-55-0) is a nonionic, three-arm polyether produced by adding a nominal average of about 18 moles of ethylene oxide to glycerol. The ethylene-oxide units are distributed across three hydroxyl-terminated arms, so G-18 is a chain-length distribution rather than one discrete compound and should not be assigned a single empirical formula. It is used as a water-compatible humectant, lubricant, solubilizing and foam-modifying ingredient, emulsification aid and chemical intermediate in suitable personal-care, toiletry and industrial formulations. Tie the grade name to a specification and confirm nominal EO basis, active matter, hydroxyl value, water, pH, color and viscosity on the current COA/TDS. Active matter is not the purity of one discrete molecule. Confirm current packaging, net weight, moisture protection and destination requirements. The material is hygroscopic and spills can be slippery; keep closed, avoid mist and direct eye contact, and follow the grade-specific SDS.

Technical information

Product	Glycerol Ethoxylate G-18 / Glycereth-18 CAS 31694-55-0
CAS number	31694-55-0
EC / list number	Not specified for the Glycereth-18 grade; verify the supplier’s EC/List identity
Molecular formula / identity	Three-arm glycerol polyether, x+y+z approximately 18 EO; variable distribution, no single molecular formula
Synonyms	Glycereth-18; Glycerol ethoxylate G-18; Ethoxylated glycerol; Glycerin ethoxylate; Polyoxyethylene glyceryl ether
Grade	Confirm nominal EO distribution, hydroxyl value, water, viscosity, color, active matter and physical form
Packaging	Confirm current packaging, net weight, moisture protection and destination requirements

Handling and documentation

Specifications may vary by grade and batch. Confirm the current TDS, COA and SDS before purchase or use. Store and handle the product in accordance with the SDS and applicable site procedures.

FAQ - Technical & Supply Chain

Q:
Is Glycereth-18 a single compound with a fixed molecular formula?

A: No. Glycereth-18 is a glycerol ethoxylate distribution with an average ethylene-oxide addition level. It is not one discrete molecule. Product comparison should therefore use the agreed distribution-related and performance-relevant controls, rather than a generic molecular formula or one purity number.
Q:
Can one Glycereth-18 grade be substituted for another by the same weight?

A: Not automatically. Products with the same nominal Glycereth-18 designation can differ in ethoxylation distribution, hydroxyl value, water and viscosity. These differences can affect formulation behaviour. Any replacement should be checked against the agreed specification and in the intended finished system.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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