39205100
PLASTICS AND ARTICLES THEREOF
Of acrylic polymers - Of poly(methyl methacrylate)
Properties of polymethyl methacrylate sheets
CN code 3920 51 covers sheets, films and strips of poly(methyl methacrylate) - PMMA, commercially known as Plexiglass, Acryglas or Perspex. PMMA is an acrylic polymer with exceptional optical clarity, transmitting over 92% of visible light, making it the most commonly used transparent plastic. PMMA sheets are manufactured by casting or extrusion, with cast sheets offering better optical properties and higher scratch resistance. PMMA features good UV resistance, dimensional stability and relatively low density compared to glass. However, the material is brittle and less impact-resistant than polycarbonate. Applications include protective glazing, lighting elements, illuminated signage, aquariums, designer furniture and medical and laboratory uses. The material can be easily machined, thermoformed and polished to restore surface clarity.
Import regulations and product safety
Importing PMMA sheets into the EU is subject to REACH Regulation (EC 1907/2006), with particular attention to methyl methacrylate monomer (MMA) as a residual substance. PMMA is a relatively chemically safe material, though products intended for food contact (e.g. food display cases, containers) must comply with Regulation (EU) No 10/2011. PMMA sheets used as building glazing must meet European standards for safety, including EN 14449 for laminated glass where used as a glass replacement in construction. For applications in electrical equipment, the Low Voltage Directive (LVD) and flammability standards apply. The GPSR on general product safety applies to PMMA sheets sold to consumers. Importers should ensure products carry appropriate labelling and usage instructions in the language of the destination country.
Commercial applications and classification
PMMA sheets classified under CN code 3920 51 represent a significant segment of the transparent plastics market. In construction, they serve as alternatives to glass in roof lights, canopies, curtain walls and balustrades. In outdoor advertising, they are used for signage and illuminated box signs. The COVID-19 pandemic significantly increased demand for PMMA sheets as protective screens. When classifying for customs purposes, it is important to distinguish PMMA sheets (3920 51) from sheets of other acrylic polymers (3920 59). PMMA specifically means poly(methyl methacrylate), while other acrylics such as poly(butyl acrylate) or acrylic copolymers are classified separately. Coloured, frosted or anti-glare coated PMMA sheets remain under code 3920 51 provided PMMA is the dominant polymer.
Properties of PMMA acrylic sheets (Plexiglass) and trade applications
Plastic products classified under CN code 3920 51 are subject to REACH registration requirements for chemical substances imported into the EU. Import requires Safety Data Sheets, technical product specifications and quality certificates. Products intended for food contact must comply with Regulation (EU) 10/2011 on plastic food contact materials. Customs authorities verify correct tariff classification and EU safety standard compliance.
Frequently asked questions
What is the difference between cast and extruded PMMA sheets?
Cast PMMA sheets are manufactured by polymerising monomer between two glass plates, resulting in a product with better optical clarity, higher scratch resistance and superior machining properties. Extruded sheets are produced by extruding PMMA granulate and are cheaper to manufacture but have slightly inferior optical properties and higher tendency for internal stresses. Both types are classified under CN code 3920 51. Cast sheets are preferred for applications requiring the highest optical quality, while extruded sheets are suitable for general-purpose applications.
What standards must PMMA sheets meet for use in construction?
PMMA sheets used as glazing in construction must comply with harmonised European standards depending on the application. For flat sheets used as glass alternatives, standard EN ISO 21032 applies. Sheets for roof lights must meet requirements for load resistance and fire classification. Depending on the application, CE certificates may be required. Importers should verify the requirements of national standards in individual EU member states, as additional requirements may apply beyond the harmonised standards.
Are PMMA sheets resistant to UV radiation?
PMMA is one of the few polymers naturally resistant to UV radiation. PMMA sheets do not yellow or lose transparency under prolonged sunlight exposure, making them the preferred material for outdoor applications. UV resistance stems from the polymer's chemical structure, which does not absorb radiation in the UV-A range. For applications requiring UV filtration, PMMA sheets with UV-blocking additives are available, used for protecting museum exhibits and in medical applications where UV filtering is essential.
What import requirements apply to products CN 3920 51?
Import of products CN 3920 51 requires REACH registration, SDS and technical specifications. For food-contact uses, compliance with Regulation (EU) 10/2011 and a Declaration of Compliance (DoC) are required.
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