What Is HEMAP? 2-Hydroxyethyl Methacrylate Phosphate

Bottom line: HEMAP means 2-hydroxyethyl methacrylate phosphate, CAS 52628-03-2. It is not ordinary HEMA: it combines a polymerisable methacrylate end with a phosphate group, allowing it to join a free-radical network and interact with inorganic surfaces.

Chemical identity of HEMAP

HEMAP contains a polymerisable methacrylate end and phosphate structures including P–OH and P=O. The polymerisable end enters coatings, adhesives or latex networks, while the phosphate end can interact with metal oxides, glass, ceramics, hydroxyapatite and other calcium- or metal-containing sites. Commercial products can differ in monoester, diester and by-product distribution, so acid value, free acid and the batch COA define the actual grade.

HEMAP versus HEMA

• HEMA is 2-hydroxyethyl methacrylate and mainly provides a hydroxyl group and polymerisable double bond.
• HEMAP adds phosphate functionality, introducing acidity, interfacial anchoring and hydrolysis-management requirements.
• HEMAP may improve adhesion to inorganic substrates but is not universally interchangeable with HEMA.
• Any replacement requires checks on acid value, hydrophilicity, amine or basic-filler compatibility, cure speed and storage stability.

Typical applications

HEMAP is used for adhesion in UV coatings, inks and adhesives, waterborne metal-protection latexes, inorganic-filler surface modification and as a clay-tolerance monomer in polycarboxylate superplasticisers. HEMA-phosphate structures also appear in dental zirconia, dental composite filler and biomaterial-interface research, but such literature does not turn an industrial grade into a validated dental or medical material.

Formulation and procurement notes

• Start with a 0.5–3% dosage ladder and set the final level from substrate and ageing tests.
• Avoid direct coexistence with amines, basic pigments and fillers, and isocyanate components.
• In waterborne systems, monitor hydrolysis, pH drift and storage stability.
• When purchasing, match HEMAP, HEMA phosphate, CAS 52628-03-2 and the exact commercial grade.

Frequently asked questions

Are HEMAP and HEMA phosphate the same term?

They generally refer to 2-hydroxyethyl methacrylate phosphate, but naming conventions can differ. Confirm the full chemical name, CAS 52628-03-2, EINECS and supplier TDS together.

Can HEMAP be used directly in human dental bonding?

No conclusion can be drawn from the chemical name alone. Dental products are regulated medical devices and require an approved, biocompatibility-tested grade for the target market. JCCM KM2110 is an industrial raw material and is not intended for direct human use.