CAS 52628-03-2: KM2110 / HEMAP Phosphate Monomer

Bottom line: CAS 52628-03-2 is the registry number for 2-hydroxyethyl methacrylate phosphate, supplied by JCCM as grade KM2110 and commonly searched as HEMAP, HEMA phosphate or hydroxyethyl methacrylate phosphate. A CAS number establishes substance identity, not a specific supplier grade, purity, monoester-to-diester ratio or regulatory status.

What CAS 52628-03-2 identifies

The substance contains a methacrylate double bond and a polar phosphate group. Its EINECS number is 258-053-2. Commercial HEMAP may be supplied with a particular monoester, diester or reaction-product distribution. Even with the same CAS number, acid value, free acid, colour, viscosity and water can differ by grade and lot, so the current TDS and COA govern.

HEMAP, HEMA phosphate and KM2110

HEMAP abbreviates 2-hydroxyethyl methacrylate phosphate; HEMA phosphate is a common search term; KM2110 is JCCM's commercial grade. HEMA alone means 2-hydroxyethyl methacrylate and contains no phosphate group. HEMA and HEMAP are not the same substance and should not be treated as equal-weight substitutes.

• Chemical name: 2-hydroxyethyl methacrylate phosphate
• CAS: 52628-03-2; EINECS: 258-053-2
• JCCM grade: KM2110
• Search aliases: HEMAP, HEMA phosphate, hydroxyethyl methacrylate phosphate, phosphate methacrylate monomer

Why it anchors inorganic interfaces

The methacrylate end can participate in UV, peroxide-initiated or emulsion polymerisation, while the phosphate group can coordinate, hydrogen-bond or condense with metals, glass, ceramics, metal oxides and selected inorganic fillers. Once bound into the cured network, it is less mobile than a conventional additive. Typical uses include UV coatings and inks, adhesives, waterborne metal protection and polycarboxylate superplasticisers.

Procurement and replacement checks

• Confirm CAS, EINECS, chemical name and supply form.
• Check monoester-to-diester distribution, acid value, free acid, water, colour, viscosity and inhibitor.
• Confirm the correct grade for the intended use; industrial grade is not automatically dental, medical, cosmetic or food-contact grade.
• Request the current TDS, SDS, COA, packaging details and change-notification policy.
• Run a dosage ladder in the same base formula and verify adhesion, water resistance, cure and storage stability.

Frequently asked questions

Is CAS 52628-03-2 the same as KM2110?

The CAS number identifies the substance, while KM2110 is a specific commercial grade. Purchase documents should state both because key properties, impurity profile and regulatory suitability can differ between suppliers and grades.

Can HEMAP directly replace HEMA?

Not on an equal-weight basis. HEMAP adds a polar phosphate end, changing acid value, hydrophilicity, cure effects and substrate interaction. Reassess compatibility, dosage and environmental performance when replacing HEMA.