Does PPG-200 contain only molecules with a molar mass of 200 g/mol?

No. The number 200 indicates a nominal number-average molar mass, not a fixed mass for every molecule or a repeat-unit count. PPG-200 contains different oligomer chain lengths. An average calculated from hydroxyl value assumes the stated hydroxyl functionality and does not establish the full distribution.

Are PPG-200 and higher-molar-mass PPG grades interchangeable by CAS number?

A shared CAS number does not establish interchangeability. PPG grades differ in hydroxyl equivalents, viscosity and water compatibility. Reactive ratios, dosage and processing conditions need reassessment for the selected grade; a one-for-one mass substitution is not established by the CAS number.

Is a chromatographic purity percentage enough to specify PPG-200?

No. PPG-200 is an oligomer distribution. Hydroxyl value, viscosity with its test temperature, water, acid value and color help characterize the commercial grade. Where an oligomer profile or named residual limit is required, the analytical report must state the applicable method, component assignments and quantitative basis.

Polypropylene Glycol 200 (PPG-200) CAS 25322-69-4

Polypropylene Glycol 200 (PPG-200), CAS 25322-69-4, is a hydroxyl-terminated polyether diol with a nominal number-average molar mass around 200 g/mol. It contains oligomers of different chain lengths and is used in industrial carrier, lubricating and reactive formulations. Grade selection depends on hydroxyl value, viscosity at a stated temperature, water content, acid value and formulation compatibility. We can provide a Certificate of Analysis (COA), Technical Data Sheet (TDS) and Safety Data Sheet (SDS) for the quoted grade.

CAS: 25322-69-4
Synonyms: Polypropylene Glycol 200, Poly(propylene glycol) 200, PPG-200
Molecular Formula: HO-[CH(CH₃)CH₂O]ₙ-H; variable n; nominal Mn ≈ 200 g/mol
Grade: Industrial polyether diol grade; hydroxyl value, viscosity with test temperature, water, acid value and color limits are specified in the quoted TDS and COA.
Package: Drum or bulk packaging, with container type and net weight specified in the quotation.

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Product Description

1 Identification and quality controls

2 Applications and grade comparisons

3 Storage and handling

4 Bulk quotation

Identification and quality controls

Quality item	Specification and reporting basis
Hydroxyl value and molar mass	Hydroxyl value is reported in mg KOH/g using an applicable titration method. For a nominal diol functionality of 2, Mn (g/mol) ≈ 112,200 / hydroxyl value (mg KOH/g), with the appropriate method corrections. This estimate is not a measurement of the complete oligomer distribution.
Viscosity	Viscosity data include the test temperature, method and unit. Dynamic viscosity in mPa·s and kinematic viscosity in mm²/s are different quantities; conversion requires density at the relevant temperature.
Water content	Karl Fischer analysis is suitable for determining water in polyols. Water-content reports state the applicable method and mass fraction, such as wt% or mg/kg. Water content affects isocyanate reactions and moisture-sensitive processing.
Acid value	Acid value is reported in mg KOH/g using an applicable titration method. It is not pH. Any pH result needs its solution concentration, medium and test conditions.
Appearance and color	Typically a clear liquid at room temperature. Appearance and color limits are specified for the quoted grade, with the agreed color scale, such as Hazen/APHA, and test method.

For orders with oligomer-profile or specified residual-component requirements, we can provide appropriate analytical information, including applicable chromatographic reports. The method must suit the low-molar-mass range or named residual, with component assignments, calibration and reporting basis. A single chromatographic peak-area percentage does not by itself establish the mass purity of the complete PPG-200 grade.

Applications and grade comparisons

As a solvent or carrier, PPG-200 is selected for its ability to dissolve formulation ingredients, behavior with water, viscosity and compatibility at the intended concentration and temperature. For esterification, etherification or polyurethane synthesis, hydroxyl equivalents, water and acid value guide reaction control.

PPG-1000 and PPG-2000 are longer-chain diol grades for comparison. Their hydroxyl equivalents, viscosity and water compatibility differ from PPG-200, so formulation ratios and processing conditions require reassessment.

Tripropylene Glycol (TPG), CAS 24800-44-0, is a lower-oligomer product used in solvent and lubricating applications. Commercial names can overlap; CAS, composition and grade specification must be matched before treating TPG and PPG-200 as interchangeable.

In polyurethane formulations with polymeric MDI (PMDI), hydroxyl equivalents and specified functionality are considered alongside isocyanate content and water. Suitability depends on the formulation and reaction conditions.

Storage and handling

Keep containers tightly closed and dry to limit moisture uptake and contamination. Follow the supplied grade’s TDS and SDS for storage temperature, incompatible materials, protective equipment, fire precautions, transport, spill response and disposal.

Bulk quotation

For a bulk quotation, send the intended application or reference grade, quantity and destination. Hydroxyl-value, viscosity, water and packaging requirements help identify the appropriate supply specification. Let us know which documents or additional analytical data are needed with the offer.

FAQ - Technical & Supply Chain

Q:
Does PPG-200 contain only molecules with a molar mass of 200 g/mol?

A: No. The number 200 indicates a nominal number-average molar mass, not a fixed mass for every molecule or a repeat-unit count. PPG-200 contains different oligomer chain lengths. An average calculated from hydroxyl value assumes the stated hydroxyl functionality and does not establish the full distribution.
Q:
Are PPG-200 and higher-molar-mass PPG grades interchangeable by CAS number?

A: A shared CAS number does not establish interchangeability. PPG grades differ in hydroxyl equivalents, viscosity and water compatibility. Reactive ratios, dosage and processing conditions need reassessment for the selected grade; a one-for-one mass substitution is not established by the CAS number.
Q:
Is a chromatographic purity percentage enough to specify PPG-200?

A: No. PPG-200 is an oligomer distribution. Hydroxyl value, viscosity with its test temperature, water, acid value and color help characterize the commercial grade. Where an oligomer profile or named residual limit is required, the analytical report must state the applicable method, component assignments and quantitative basis.

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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