Polyethylene glycol 300 (PEG 300) is a low-molecular-weight, water-soluble polyethylene glycol supplied as a liquid for use in formulations and industrial processes. Buyers commonly assess it as a solvent, carrier, humectant, or processing ingredient, but its suitability depends on the application, required grade, and product specifications. PEG 300 has a nominal average molecular weight of 300 g/mol; this is an average for a mixture of polymer chains, not the exact molecular weight of every molecule. Use the selection framework below to compare grades, confirm technical requirements, and evaluate suppliers before requesting a quotation.
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This guide is intended for procurement teams, formulators, distributors, and process engineers evaluating PEG 300 for commercial use. It can help buyers prepare a clear specification and identify questions to resolve during supplier qualification. It is not a substitute for application testing, regulatory review, or the technical documentation required for a particular end use.
Polyethylene glycol is a family of polymers formed from repeating ethylene oxide units. PEG grades are commonly identified by an approximate average molecular weight, so PEG 300 contains a distribution of chain lengths rather than one uniform molecule. The repeating ethylene oxide unit has a molar mass of approximately 44.05 g/mol; the nominal grade value describes the average material and should not be treated as a precise chain-length specification.
PEG 300 is generally supplied as a clear to slightly colored liquid, though appearance limits should be confirmed against the supplier’s specification. Its ether and hydroxyl groups contribute to its affinity for water and its use in aqueous or mixed formulations. Properties such as viscosity, water content, and color can vary by specification and manufacturing controls, so buyers should request current product documentation instead of relying on a generic description.
Lower-molecular-weight PEG grades are typically more fluid, while higher-molecular-weight grades become more viscous and may be supplied as pastes, flakes, or solids. The precise transition depends on grade and conditions, so physical form should be verified for the product being purchased. If a process requires a particular flow rate, pumpability, or dissolution profile, compare candidate grades under the process conditions rather than selecting by molecular-weight label alone.
PEG 300 may be considered as a solvent or carrier in formulations where compatibility with water and other ingredients is important. It can also function as a humectant or formulation aid, depending on the product design and applicable regulations. In industrial settings, buyers may evaluate it as a processing ingredient or component in blends; the role and dosage should be established through formulation work and verified against the intended use.
| Application consideration | What to verify |
|---|---|
| Aqueous or mixed formulation | Solubility, compatibility with other ingredients, and performance at the intended concentration |
| Liquid handling or processing | Viscosity at the relevant temperature, pumpability, and storage conditions |
| Regulated or sensitive end use | Applicable grade, documentation, permitted use, and customer or regulatory requirements |
| Commercial blending or distribution | Consistent specifications, packaging, traceability, and supply continuity |
Water solubility alone does not establish suitability for every formulation. Test PEG 300 with the complete ingredient set, because compatibility can be affected by concentration, temperature, pH, and other formulation variables. Where viscosity matters, specify the test temperature; for example, request results measured at 25°C if that reflects the buyer’s evaluation conditions.
Start by describing the product or process in which PEG 300 will be used. State whether the material is intended for industrial, personal care, pharmaceutical, or another application, and identify any required grade or regulatory constraints. Do not assume that a general-purpose material meets a higher or specialized grade requirement simply because it has the same nominal molecular weight.
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Request a specification sheet and identify which parameters are essential for acceptance. Common items to review include appearance, average molecular weight or range, viscosity, water content, acidity or pH-related limits where applicable, and any relevant impurity controls. Record units, test methods, and acceptance limits wherever possible so that supplier offers can be compared on a consistent basis.
Ask whether each value is a guaranteed release limit, a typical value, or an informational range. These categories are not interchangeable: a typical value describes expected performance but may not serve as an agreed acceptance criterion. If a specific property is critical to the process, confirm that it can be controlled and reported for each batch.
Conduct a small-scale compatibility trial using the actual formulation or process conditions before committing to routine volumes. Assess relevant outcomes such as clarity, phase behavior, viscosity, stability, and processing performance over the time and temperature range that matters to the application. Keep trial conditions documented so that results can be compared across candidate products.
Price depends on factors such as grade, order volume, packaging, delivery destination, and market conditions. Minimum order quantity and lead time are supplier- and order-specific; request a current quotation rather than assuming standard terms. For ongoing demand, discuss forecast visibility, repeat-order planning, packaging options, and how changes to specifications or supply availability will be communicated.
Documentation should be reviewed against the buyer’s own qualification process and end-use requirements. A supplier’s ability to provide a document does not, by itself, establish regulatory suitability for a particular application. Where compliance matters, specify the required jurisdiction, grade, and supporting records during the initial inquiry.
As a polyethylene glycol supplier, Xipuao can support B2B buyers evaluating PEG 300 by discussing the intended application, required specification, order quantity, and packaging needs. We recommend sharing the target grade, essential acceptance limits, destination, and expected purchasing schedule when requesting a quotation. This information helps us assess the fit and clarify which product documents and commercial options are relevant.
PEG 300 is a liquid polyethylene glycol grade with a nominal average molecular weight of 300 g/mol, used in applications that may require a water-compatible solvent, carrier, humectant, or processing ingredient. The best choice is the product whose verified specification and grade match your formulation or process—not simply the product with the right label. Define the end use, agree on measurable acceptance criteria, test compatibility, and confirm supply terms before approving a source.
For a practical next step, prepare your target specification and estimated order volume, then request current technical information and a quotation from Xipuao. If you are still comparing grades, include the required handling properties and intended application so the discussion can focus on fit, documentation, and supply planning.
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