Does PPG-1000 have a single molecular weight?

No. PPG-1000 is a polymer grade with chains of different lengths and a nominal average molar mass around 1,000 g/mol. The reported average depends on its analytical basis: a value calculated from hydroxyl number is not a molecular-weight distribution measured by SEC/GPC.

Can PPG-2000 replace PPG-1000 in the same formulation?

A shared CAS number does not establish interchangeability. PPG-2000 diol grades generally have a higher average chain length, lower hydroxyl value and different viscosity. Polyurethane formulations need the hydroxyl equivalents, water content and process behaviour re-evaluated before a grade change.

Polypropylene Glycol 1000 (PPG-1000) CAS 25322-69-4

Polypropylene Glycol 1000 (CAS 25322-69-4), also called PPG-1000 or poly(propylene oxide) diol, is a liquid polyether diol with a nominal average molar mass around 1,000 g/mol. It is used as a reactive polyol component in polyurethane formulations and, in suitable grades, as a lubricant, plasticizer or foam-control component in industrial systems. Hydroxyl value, functionality, viscosity, water content and acid value distinguish grades for the intended application. Send your application, quantity and destination for a quotation; a target specification helps match the grade.

CAS: 25322-69-4
Synonyms: PPG-1000; Polypropylene glycol 1000; Polyoxypropylenediol (nominal 1000); Poly(propylene oxide) diol (nominal 1000)
Molecular Formula: General polyether diol structure: HO–[CH(CH₃)CH₂O]ₙ–H; nominal average molar mass around 1,000 g/mol; polymer with a distribution of chain lengths.
Grade: Industrial polyether diol; quoted grades are specified by hydroxyl value, functionality, viscosity at the stated temperature, water content and acid value.
Package: Packaging and net weight are specified in the quotation for the required quantity and destination.

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Product Description

1 Parameters

2 Applications

3 Quality and technical documents

5 Storage

6 Safety

Parameters

Chemical identity	Polypropylene glycol; polyoxypropylene diol
CAS number	25322-69-4
General structure	HO–[CH(CH₃)CH₂O]ₙ–H; varying chain length n
Nominal average molar mass	Around 1,000 g/mol; the reported average and its method are stated for the quoted grade
Functionality	Nominal diol functionality 2; grade functionality and hydroxyl value are relevant for reactive formulations
Hydroxyl value	About 100–120 mg KOH/g is a commercial PPG-1000 diol reference, not a universal limit. The grade specification states the agreed range and method.
Viscosity	Dynamic viscosity in mPa·s at the stated temperature and method; any kinematic result uses mm²/s (cSt)
Water content	Reported as mass fraction with the applicable Karl Fischer titration method
Acid value	Reported separately in mg KOH/g with the grade limit and method

Applications

PPG-1000 is used as a reactive polyether diol for polyurethane prepolymers, adhesives, coatings and elastomers in suitable grades. Hydroxyl value and functionality guide reactive-equivalent calculations; water content and viscosity also affect processing. Formulation performance depends on the selected grade and process conditions.

In compatible industrial formulations, PPG-1000 can also serve as a lubricant, plasticizer or foam-control component. Examples include paper-process and coating systems. Performance should be evaluated at the actual formulation composition and operating temperature.

Quality and technical documents

We can provide the COA (Certificate of Analysis), TDS (Technical Data Sheet) and SDS (Safety Data Sheet) for the quoted PPG-1000 grade. The TDS gives its specifications and test conditions, the COA records the reported batch results, and the SDS covers safe handling.

Hydroxyl value is measured by an applicable polyol method and reported in mg KOH/g. Karl Fischer titration is suitable for water content; acid value is a separate titrated quantity in mg KOH/g. Viscosity data must include the temperature, method and whether the result is dynamic or kinematic.

For orders specifying molecular-weight distribution control, we can provide size-exclusion chromatography (SEC) / gel permeation chromatography (GPC) reports with Mn, Mw, test conditions and calibration basis. A number-average molar mass calculated from hydroxyl value is an end-group estimate and does not by itself describe the molecular-weight distribution.

Related grades and formulation components

Polypropylene glycol 200 (PPG-200) and polypropylene glycol 2000 (PPG-2000) have different average chain lengths, hydroxyl values and viscosities within the PPG diol family. Compare these properties for the intended formulation; a shared CAS number alone does not make the grades interchangeable.

Polyethylene glycol 1500 (PEG-1500) provides a comparison with an oxyethylene-based polyether diol rather than another PPG molar-mass grade. Its backbone, physical form and formulation compatibility differ, so substitution requires its own formulation assessment.

For polyurethane prepolymers and reactive adhesives, polymeric MDI (PMDI) supplies the isocyanate component to react with the hydroxyl groups of a PPG-1000 diol. The selected PMDI grade’s NCO content and functionality must be matched to the polyol hydroxyl value, water content and intended cure conditions.

Storage

Keep the container closed in a dry, ventilated storage area and follow the storage temperature and handling conditions in the supplied grade TDS/SDS. Limit moisture pickup during storage and transfer.

Safety

For industrial use. Follow the supplied grade SDS for hazard classification, ventilation, protective equipment and spill handling. Prevent uncontrolled release during handling.

FAQ - Technical & Supply Chain

Q:
Does PPG-1000 have a single molecular weight?

A: No. PPG-1000 is a polymer grade with chains of different lengths and a nominal average molar mass around 1,000 g/mol. The reported average depends on its analytical basis: a value calculated from hydroxyl number is not a molecular-weight distribution measured by SEC/GPC.
Q:
Can PPG-2000 replace PPG-1000 in the same formulation?

A: A shared CAS number does not establish interchangeability. PPG-2000 diol grades generally have a higher average chain length, lower hydroxyl value and different viscosity. Polyurethane formulations need the hydroxyl equivalents, water content and process behaviour re-evaluated before a grade change.

Ordering & Documentation

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

Documents

Tell us which documents your procurement team needs. Before an order, we will check whether the quoted source can provide them for the offered lot.

Quotation

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

Sample & Supply

Ask whether samples, trial quantities or repeat orders are possible. We will check each request against the sourced product and current offer.

Storage & Shipping

Product-specific conditions are confirmed before order.

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