Polyethylene glycol 300 (PEG 300) is a low-molecular-weight, water-miscible liquid used as a solvent, carrier, humectant, and formulation ingredient. Its nominal average molecular weight is about 300 g/mol, which helps distinguish it from higher-molecular-weight PEG grades that are typically more viscous or solid. Manufacturers use PEG 300 in pharmaceutical, personal care, and industrial formulations, with suitability depending on the required grade, local regulations, and the finished product’s performance needs.
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For buyers, the key is to match the material specification to the application rather than select by the “300” designation alone. We recommend confirming intended use, purity requirements, water content, viscosity, and documentation before requesting a quotation. These details help a supplier identify the appropriate product and provide information relevant to qualification.
PEG 300 is a polyethylene glycol, a family of polymers formed from ethylene oxide units. The number in the name refers to an approximate average molecular weight, not a single exact molecular size for every molecule in the product. Each ethylene oxide repeat unit contributes about 44.05 g/mol, while the commercial material contains molecules with a distribution of chain lengths.
At ordinary room conditions, PEG 300 is generally supplied as a liquid. It is water-miscible and can also be compatible with a range of polar ingredients, although compatibility should be verified in the buyer’s own formula. These properties make it useful when a formulator needs a liquid carrier or solvent rather than a solid, higher-molecular-weight PEG.
PEG 300 can help dissolve or carry selected active and functional ingredients. In a formulation, it may support the distribution of components that are difficult to incorporate directly into water or another base. Its performance depends on the specific ingredient, concentration, temperature, and full formulation, so compatibility testing is an important development step.
In personal care and other formulated products, PEG 300 may contribute to moisture retention and product feel. Formulators assess it alongside the other humectants, emollients, and solvents in the product rather than treating it as a standalone moisturizer. The final level should be established through product testing and applicable regulatory review.
PEG 300 can also serve as a vehicle or processing aid in selected applications. Depending on the system, it may affect flow, viscosity, ingredient handling, or the way a product is applied. These effects are formulation-specific, so buyers should evaluate the material in a representative prototype before moving to production.
PEG 300 may be used as a solvent, vehicle, or excipient in certain pharmaceutical products. The appropriate grade and use depend on the product type, route of administration, applicable pharmacopoeial or regulatory requirements, and the manufacturer’s approved formulation. Buyers should not assume that a general industrial specification is suitable for pharmaceutical use; they should request the documentation and grade confirmation required for their project.
Formulators may use PEG 300 in products such as creams, lotions, cleansers, and other liquid or semi-solid preparations. Its role may include carrying ingredients, helping with solubility, or supporting the desired texture and moisture profile. The final suitability depends on the full ingredient system and the requirements for the intended market.
Outside consumer and pharmaceutical products, PEG 300 can be considered for selected industrial formulations where a water-miscible liquid carrier or solvent is useful. Potential contexts include specialty processing, coatings, and other formulated products, but suitability is not universal. A technical review and small-scale compatibility trial are prudent before specifying it for a production process.
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PEG grades differ mainly in average molecular weight and the physical and functional properties that follow from it. Compared with higher-molecular-weight grades, PEG 300 is a relatively low-molecular-weight liquid, while many higher grades are more viscous or supplied as solids. This is a general distinction; exact appearance and performance should be confirmed against the supplier’s specification for the grade being quoted.
Choose PEG 300 when the formulation requires a liquid PEG with its particular solvency and handling profile. Consider a different molecular-weight grade if the process requires a solid material, a different viscosity range, or another performance characteristic. The right choice should be based on bench testing and the product specification, not molecular weight alone.
A product name identifies the general grade, but it does not replace a technical specification. For procurement and quality review, request current product documentation and confirm the test methods and acceptance limits that apply to your intended use. Specifications and available documents can vary by supplier and grade.
| Specification area | What to confirm | Why it matters |
|---|---|---|
| Identity and grade | Product designation, intended grade, and applicable standard if required | Helps establish that the offered material fits the application and qualification process |
| Average molecular weight | Target or stated range, expressed in g/mol | Supports comparison between PEG grades and supplier specifications |
| Water content | Limit or result reported as a percentage, with the test method | Moisture can affect formulation behavior and process consistency |
| Physical properties | Appearance, viscosity in mPa·s at a stated temperature, and any other required tests | Allows buyers to assess handling and process fit using comparable conditions |
| Documentation | Certificate of Analysis, Safety Data Sheet, and other documents required by the buyer | Supports receiving inspection, internal review, and regulatory assessment |
Do not compare viscosity values without checking the measurement temperature and method, because reported results are only meaningful when their test conditions are clear. Likewise, agree on how each specification is measured and what limits apply before placing a bulk order. For regulated uses, confirm the relevant requirements with your quality and regulatory teams.
Start by sharing the application, target grade, expected annual or trial quantity, destination, and any mandatory specification or document requirements. Ask the supplier to confirm product identity, available documentation, packaging options, and whether the requested specification can be supported. For planning, buyers may state a desired pack size such as 25 kg or 200 kg, but actual formats and availability must be confirmed for the order.
For a new formulation, request a representative sample where available and test it under your normal process conditions. Evaluate compatibility, appearance, viscosity, and finished-product performance against your internal acceptance criteria. Before scaling up, align purchasing, quality, and logistics teams on batch documentation, packaging, shipment timing, and storage instructions.
At Xipuao, we support B2B inquiries for polyethylene glycol 300 by discussing the application, specification, and supply requirements before quotation. Share the grade or standard you require, the intended use, target quantity, destination, and documents needed for evaluation. We can then confirm the relevant product details, available packaging, and commercial terms for your inquiry.
For projects with a specific moisture limit, viscosity range, or regulatory documentation requirement, include those details in your request rather than relying on a generic PEG 300 description. This gives our team a clearer basis for checking the fit and responding with relevant information. Final acceptance should be based on the confirmed specification and your own qualification process.
Polyethylene glycol 300 is primarily used as a liquid solvent, carrier, humectant, and formulation aid in pharmaceutical, personal care, and selected industrial products. Its nominal average molecular weight of about 300 g/mol and water miscibility make it a useful option where a low-molecular-weight liquid PEG is needed, but suitability depends on the precise application and grade. To move forward, define your technical limits, identify required documentation, and test the product in your formulation before scaling up.
Contact Xipuao with your application, target specification, quantity, and destination to discuss PEG 300 supply options and request information for your purchasing review.
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