Does PPG-2000 have one exact molecular weight?

No. PPG-2000 contains polymer chains of different lengths and has a nominal average molar mass around 2,000 g/mol. CAS 25322-69-4 does not define the molecular-weight distribution or end-group functionality. An average estimated from hydroxyl value is different from a distribution measured by SEC/GPC.

What does PPG-2000 indicate about hydroxyl functionality?

PPG-2000 commonly denotes a polypropylene glycol diol with nominal hydroxyl functionality of two. The quoted grade specification identifies the nominal functionality and hydroxyl value used for formulation calculations. The grade name alone does not establish effective functionality or a particular molecular-weight distribution.

Can PPG-1000, PPG-2000 and PPG-3000 be interchanged by CAS number?

A shared CAS number does not establish interchangeability. These diol grades differ in average chain length, hydroxyl value and viscosity. A grade change in a polyurethane formulation requires the hydroxyl equivalents, water content and process behaviour to be re-evaluated before the component ratios are adjusted.

Polypropylene Glycol 2000 (PPG-2000) CAS 25322-69-4

PPG-2000 (polypropylene glycol 2000, CAS 25322-69-4) is a liquid polyether diol with a nominal average molar mass of about 2,000 g/mol. Grades for polyurethane intermediates, lubricants and foam-control formulations are selected by hydroxyl value, viscosity and water content. Send your application, quantity and destination for a quotation; an existing specification helps match the grade.

CAS: 25322-69-4
Synonyms: PPG-2000; Polypropylene glycol 2000; Polyoxypropylene glycol 2000
Molecular Formula: Propylene-oxide-based polyether diol with hydroxyl end groups; repeat unit (C3H6O)n and nominal average molar mass about 2,000 g/mol. The polymer has no single fixed molecular formula.
Grade: Industrial polyether diol grade specified by hydroxyl value, nominal hydroxyl functionality, viscosity at a stated temperature, water content, acid value, colour and appearance. Relevant additives, where applicable, are identified for the quoted grade.
Package: Drums, IBCs or bulk supply; packaging, net weight and handling requirements are specified in the quotation for the order quantity and destination.

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Product Description

1 Parameters

2 Applications and grade selection

3 Quality documents and testing

4 Storage and handling

Parameters

Product identity	Propylene-oxide-based polyether diol with a nominal average molar mass around 2,000 g/mol. The grade consists of polymer chains of different lengths.
Specification basis	The quoted grade TDS states the specification and applicable test conditions; the batch COA reports the listed test results. The nominal molecular mass is not a purity percentage.
Hydroxyl value and functionality	Hydroxyl values around 54–58 mg KOH/g are a typical reference for PPG-2000 diols, not a universal acceptance range. The quoted grade limits and specified hydroxyl functionality support reactive formulation calculations.
Viscosity	Viscosity data include the viscosity type, unit, test temperature and method. Dynamic viscosity in mPa·s or cP differs from kinematic viscosity in mm²/s or cSt; numerical conversion requires density at the same conditions.
Water content	Water content is specified as a mass fraction with the applicable Karl Fischer method and agreed limit. Moisture control matters in polyurethane processing because water reacts with isocyanates.
Acid value	Acid value is specified separately in mg KOH/g with the applicable titration method and agreed limit. Acid value is not a pH measurement.
Colour and appearance	The quoted grade specifies the colour scale and method, appearance requirements and relevant additive information.

Applications and grade selection

PPG-2000 is used as a polyether diol intermediate in polyurethane prepolymers, coatings, adhesives and elastomers. Other industrial uses include lubricant and functional-fluid base stocks, foam-control formulations and processing aids. Compatibility, dosage, foam behaviour and process performance are evaluated in the intended formulation and operating conditions.

Compare PPG-1000 and PPG-200 when selecting a shorter-chain polyether diol. Their hydroxyl equivalents and viscosity differ from PPG-2000, so a grade change requires a new assessment of the formulation and processing conditions.

For industrial fluid and foam-control formulations, BPE-1500 butanol EO/PO polyether and GPE 3000 glycerol-initiated EO/PO polyether offer different initiating groups and chain architectures. Compare their composition, hydroxyl functionality, viscosity and compatibility for the intended system; neither is a direct one-for-one replacement for PPG-2000.

Quality documents and testing

We can provide a Certificate of Analysis (COA), Technical Data Sheet (TDS) and Safety Data Sheet (SDS) for the quoted PPG-2000 grade. The COA reports batch analysis, the TDS records the grade specification and applicable test methods, and the SDS covers safe handling. Hydroxyl value and acid value are determined by applicable titration methods; water content is measured by Karl Fischer analysis.

For purchases with molecular-weight-distribution requirements, size-exclusion chromatography (SEC/GPC) reports can be provided with number-average molar mass (Mn), weight-average molar mass (Mw) and dispersity, together with the method conditions and calibration basis. An average calculated from hydroxyl value assumes the stated functionality and does not describe the full polymer distribution.

Storage and handling

Keep PPG-2000 tightly closed in compatible containers in a cool, dry, ventilated area, protected from moisture, heat and contamination. Limiting exposure to humid air helps maintain the specified water content. Use suitable gloves and eye protection, provide ventilation and prevent spills. The SDS for the quoted grade gives the applicable storage, handling, transport and disposal information.

FAQ - Technical & Supply Chain

Q:
Does PPG-2000 have one exact molecular weight?

A: No. PPG-2000 contains polymer chains of different lengths and has a nominal average molar mass around 2,000 g/mol. CAS 25322-69-4 does not define the molecular-weight distribution or end-group functionality. An average estimated from hydroxyl value is different from a distribution measured by SEC/GPC.
Q:
What does PPG-2000 indicate about hydroxyl functionality?

A: PPG-2000 commonly denotes a polypropylene glycol diol with nominal hydroxyl functionality of two. The quoted grade specification identifies the nominal functionality and hydroxyl value used for formulation calculations. The grade name alone does not establish effective functionality or a particular molecular-weight distribution.
Q:
Can PPG-1000, PPG-2000 and PPG-3000 be interchanged by CAS number?

A: A shared CAS number does not establish interchangeability. These diol grades differ in average chain length, hydroxyl value and viscosity. A grade change in a polyurethane formulation requires the hydroxyl equivalents, water content and process behaviour to be re-evaluated before the component ratios are adjusted.

Ordering & Documentation

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

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Quotation

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Storage & Shipping

Product-specific conditions are confirmed before order.

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