What is the best adhesive for bonding Acrylic?

Acrylic (PMMA – polymethyl methacrylate) is a transparent, thermoplastic that is commonly known as Plexiglas®.

Thermoplastics like Acrylic can be heated to their melting point, cooled and reheated without substantial degradation. This allows them to be easily injection moulded.

PMMA has high strength, stiffness, optical clarity and resistance to UV and weathering. These properties make it ideal for many applications including windows and skylights, automotive lenses and instrument panels, medical devices and signage.

PMMA can be coloured, moulded, cut, drilled, and formed to suit the application.

Main Acrylic properties

– Surface energy: 38mJ/m²

– Maximum service temperature: 85°C

– Melting temperature: 120°C

Adhesives for bonding Acrylic

Cyanoacrylate adhesives offer rapid cure within seconds and all grades bond well to acrylics. It is important to use the cyanoacrylate sparingly or it may fog the acrylic if too much is applied. Cyanoacrylate adhesives are suitable for high speed assemblies as they do not require any mixing or curing equipment. The disadvantages of using Cyanoacrylates is the maximum gap fill is 0.5mm.

Alkoxy-ethyl cyanoacrylates can be used to reduce the powdery residue on the surface and the odour is less pungent compared to an Ethyl cyanoacrylate.

Epoxy adhesives such as two component epoxies can be used to bond acrylic. One component epoxies may not be suitable for bonding acrylics as they require heat to cure which can damage the acrylic.

MS Polymer-based adhesives can be used when a flexible bonding solution is needed.

UV Curable adhesives that have a UV/visible light cure is recommended for acrylics as most grades of acrylics are UV stabilized.

Surface preparation tips for Acrylic

Surfaces must be clean, dry and free from contamination before the bonding application. The acrylic can then be bonded “As received”.

To clean surfaces, we recommend using isopropanol or an impregnated wipe like Wipemaster Wipe 9 IPA Wet Wipes.

For more tips on surface treatments, read: Surface Preparation for Adhesive Bonding

Contact us for product recommendations on your application.

Looking for tips on bonding other plastics, read: What you need to know on bonding plastics

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If you have a problem with industrial adhesives, sealants, or electronic protection products and require advice, you can contact our technical support service. Our team can help you to optimize your processes and applications.

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