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Plywood glue types and classifications

With different plywood glue types and classifications available for plywood depending on it's end use we put together this simple guide for all of our plywood.

Glue Classifications for Interior / Exterior

EN314-2 Durability of glue bond between the layers within the plywood.

  • Class 1 = Interior (dry) conditions.
  • Class 2 = Humid conditions. This can include protected exterior applications or damp internal applications.
  • Class 3 = Exterior conditions. This includes exposure to the weather over long periods or exposure to relative high humidity.

EN636 Classification

The EN636 classification takes into account the glue classification and other structural factors (such as bending strength) relating to the plywood to give it a more detailed grading. There are three grading’s which are shown in the table below


For a material to be rated as, for example, EN636-2 the material would need meet all the factors needed to meet the EN636-2 specification.

Interior and Exterior Glue and Laser Cutting

Interior glue is generally considered the preferred option for materials that are to be laser cut. This is because the exterior glue causes a more obvious ‘burnt’ look on and around the area that is cut.

Formaldehyde Emission

All products made from wood will emit some naturally occurring Formaldehyde. Some products such as MDF can have Formaldehyde added during the manufacturing process. There are two European Formaldehyde classes that define the level of Formaldehyde emission. These are E1 and E2. E1 refers to a level that is less than 0.1 ppm (parts per million) and for E2 boards it is between 0.1 ppm and 0.3 ppm. All of our plywood and MDF falls into the E1 (low emission) classification.

Environmental Certification

PEFC Certified (Programme for the Endorsement of Forest Certification)

PEFC works throughout the entire forest supply chain to promote good practice in the forest and to ensure that timber and non-timber forest products are produced with respect for the highest ecological, social and ethical standards. Thanks to its eco-label, customers and consumers are able to identify products from sustainably managed forests. For more information

FSC Certified (Forest Stewardship Council)

FSC certified forests are managed with consideration for people, wildlife and the environment. For more information visit

Materials, Perspex. Plywood, Polypropylene
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6 thoughts on “Plywood glue types and classifications”

  • What is the glue actually made out of?

  • Hi, I’m looking to buy a glue that will bond plywood to make square blocks and inturn create balls that need to withstand extreme shock!? But also not to toxic to use? Any ideas

    • Mark Donnison June 7, 2019 at 9:29 am

      Hi Nick, our wood glue needs are quite standard and as such we haven't had to do much research into specialist adhesives. Google can probably steer you in the right direction.

  • Hi I wanted to ask if the chipboards with melamine paper which uses E1 has more strength or E2

    • Mark Donnison July 11, 2019 at 3:06 pm

      Hi Jack, All of our plywood and MDF falls into the E1 (low emission) classification so we cannot reliably state on the differences between the two. A google search of the following may throw up some useful information: Properties of E2 particleboard versus E1 particleboard

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