Does CAS 9002-98-6 define one fixed Polyethyleneimine grade?

No. CAS 9002-98-6 identifies a polyethyleneimine polymer class, not one molecular weight or concentration. Define branched or linear architecture, molecular-weight average and method, active solids, solvent or water basis, viscosity, pH and amine value before comparing commercial PEI grades.

Which PEI properties should be matched to an industrial process?

Match molecular weight and distribution, active solids, charge or amine density, viscosity at a stated temperature, pH at a stated concentration, residual ethyleneimine and dilution medium. Application trials should use the offered grade because equal CAS numbers do not ensure equal handling or performance.

What should a bulk Polyethyleneimine inquiry include?

State the required architecture, molecular-weight range, solids concentration, viscosity range, solvent system, quantity, package and destination. Request the batch COA plus TDS and SDS, and agree sampling and test methods before scale-up or repeat supply.

Polyethyleneimine (PEI) CAS 9002-98-6

Polyethyleneimine (PEI), CAS 9002-98-6, is a polymer class with repeating unit (C₂H₅N)ₙ, not a single fixed-purity molecular substance. Commercial PEI varies by branched or linear architecture, number- or weight-average molecular weight, molecular-weight distribution, active-solids concentration, solvent or water content, amine value, viscosity and pH. Buyers must define these parameters before comparing samples, prices or application performance.

CAS: 9002-98-6
Synonyms: Polyethyleneimine, Polyethylenimine, PEI, Poly(ethylene imine), Aziridine homopolymer
Einecs: 618-346-1
Molecular Formula: (C₂H₅N)ₙ
Grade: Confirm branched or linear architecture, the commercial grade code, average molecular weight and molecular-weight distribution, active solids, solvent or water content, viscosity, pH and amine value against the current TDS and COA.
Package: State required quantity, physical form and destination; confirm the current bag or container, liner, net weight, temperature handling and transport requirements before quotation.

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Product Description

1 Identity and specification

2 Quality controls for purchasing

3 Applications and grade selection

4 Storage and handling

5 Documentation and quotation details

Identity and specification

Item	Verified purchasing information
Product class	Polyethyleneimine; PEI; aziridine homopolymer
CAS / EC	9002-98-6 / 618-346-1
Repeating unit	(C₂H₅N)ₙ
Critical selection point	Architecture, molecular weight and supplied concentration

PEI can be branched or linear and may be supplied neat, as an aqueous solution or in another documented form. CAS 9002-98-6 identifies the polymer category, while molecular weight, architecture and concentration define the commercial grade.

Quality controls for purchasing

Specify branched or linear structure, average molecular weight and distribution or the supplier grade designation.
Define active solids, water or solvent, viscosity, pH, amine value, color and density on agreed test conditions.
Set limits for residual aziridine or other monomer, low-molecular fractions and application-relevant metals or salts.

Applications and grade selection

PEI is evaluated as a cationic polymer in adhesion, coatings, paper, water treatment, complexation, dispersion and surface-modification systems. Performance depends strongly on molecular architecture, molecular weight, solids and formulation pH. Application trials are essential before grade substitution.

For a related cationic water-treatment polymer material, see PolyDADMAC Powder.

Storage and handling

Store in compatible sealed packaging within the supplier temperature range. Protect aqueous grades from freezing or excessive heat as specified, and protect dry grades from moisture. Follow the SDS for corrosive or irritating amine handling.

Documentation and quotation details

State architecture, molecular weight, active solids, viscosity and pH methods, residual monomer limit, quantity, package, destination and application. Request a lot COA, SDS, TDS and sample for performance comparison.

FAQ - Technical & Supply Chain

Q:
Does CAS 9002-98-6 define one fixed Polyethyleneimine grade?

A: No. CAS 9002-98-6 identifies a polyethyleneimine polymer class, not one molecular weight or concentration. Define branched or linear architecture, molecular-weight average and method, active solids, solvent or water basis, viscosity, pH and amine value before comparing commercial PEI grades.
Q:
Which PEI properties should be matched to an industrial process?

A: Match molecular weight and distribution, active solids, charge or amine density, viscosity at a stated temperature, pH at a stated concentration, residual ethyleneimine and dilution medium. Application trials should use the offered grade because equal CAS numbers do not ensure equal handling or performance.
Q:
What should a bulk Polyethyleneimine inquiry include?

A: State the required architecture, molecular-weight range, solids concentration, viscosity range, solvent system, quantity, package and destination. Request the batch COA plus TDS and SDS, and agree sampling and test methods before scale-up or repeat supply.

Ordering & Documentation

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

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

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

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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