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.
| Useful Laser Plywood (laserply) Resources. |
|---|
| What Is Laser Plywood (laserply). |
| Plywood: The Production Process. |
| Plywood glue types and classifications. |
| Looking after your plywood. |
| How is Poplar Plywood Different to Birch Plywood? |
| A Guide to Plywood Grading. |
| A guide on using laser materials. |
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6 comments
Mark Donnison
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
Jack Yang
Hi I wanted to ask if the chipboards with melamine paper which uses E1 has more strength or E2
Mark Donnison
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.
Nick
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
Hi Christopher, you would have to refer to the manufacturer's documentation for that level of detail.
Christopher
What is the glue actually made out of?