The HEMA Detection Test is a specialized laboratory analysis used to detect and quantify 2-Hydroxyethyl Methacrylate (HEMA) in cosmetics and nail products. HEMA is a methacrylate monomer commonly found in gel nail polishes, builder gels, base coats, and UV/LED-curing nail systems, but it is also one of the best-known skin sensitizers in nail cosmetics.

Purpose of the test

The purpose of the HEMA Detection Test is to determine whether a product contains HEMA and, if present, to accurately measure its concentration. The test is essential for regulatory compliance, consumer safety and market access, especially in the European Union where strict restrictions apply to the use of HEMA.

Regulatory Background

According to EU Cosmetics Regulation (EC) No. 1223/2009, HEMA is classified as a restricted substance and may only be used under specific conditions. It is prohibited in products intended for consumer use on the skin, such as leave-on cosmetics, and is only permitted in nail products for professional use if strict labeling and usage conditions are met.

Due to its strong sensitizing potential, authorities in the EU closely monitor nail products for their HEMA content. Products found to contain no HEMA or excessive amounts of HEMA may be withdrawn from the market, recalled, or refused entry.

Why HEMA detection is important

• Consumer safety: HEMA is a major cause of contact dermatitis and allergic reactions among nail stylists and consumers.

• Regulatory compliance: Confirms whether a product complies with EU cosmetics legislation and restrictions on professional use.

• Label verification: Ensures correct ingredient declarations and warnings for professional use.

• Market access: Required by distributors, retailers, and authorities for placing nail products on the EU market.

• Quality control: Detects contamination of raw materials or inconsistencies in the formulation.

Methodology

The HEMA detection test is performed using highly sensitive analytical techniques:

• High-performance liquid chromatography (HPLC)

• Gas Chromatography-Mass Spectrometry (GC-MS)

• Liquid chromatography-mass spectrometry (LC-MS/MS)

These methods enable precise identification and quantification of HEMA, even at trace levels, allowing for reliable compliance monitoring.

Test procedure

1. A representative sample of the nail product (gel polish, base coat, builder gel, etc.) is collected.

2. The sample undergoes solvent extraction to isolate monomers and methacrylate compounds.

3. The extract is analyzed using validated chromatographic methods.

4. HEMA is identified by comparison with certified reference standards.

5. Quantitative results are calculated and checked against prescribed threshold values.

Results and reporting

The laboratory report usually contains:

• Confirmation of the presence or absence of HEMA

• Quantitative concentration results (mg/kg or % w/w)

• Method detection limits and analytical uncertainty

• Reference to applicable EU cosmetic regulations

• Declaration of conformity indicating whether the product complies with legal requirements

Typical applications

• UV/LED gel nail polishes

• Building and modeling gels

• Base coats and bonding systems

• Nail hardeners and primers

• Raw material testing for nail product manufacturers

Why this test is important

HEMA is one of the most closely monitored ingredients in nail cosmetics due to the high risk of hypersensitivity. The HEMA Detection Test provides manufacturers, importers, and responsible parties with clear, defensible evidence that their products are safe, compliant with regulations, and suitable for the intended market.

This test is often included as part of a broader compliance package for nail products, alongside TPO detection, allergen screening, safety assessment (CPSR) and PIF documentation, to ensure the product is fully ready for the EU market.