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Sunday, March 6, 2022

Exterior grade Plywood vs. Interior grade plywood | homeslibro

This article explains what plywood exterior and interior grades are, how each one is made and compares the two based on a number of factors.

 

As the name implies, interior grade plywood is very suitable for indoor use in homes and offices. The plywood furniture we use in our home is actually made from this type of plywood.

 

Exterior quality plywood is an excellent material and is considered ideal for outdoor use such as garden tables and chairs that are placed outside with natural elements.

 

Manufacturing differences between Exterior grade Plywood and Interior grade plywood:

Plywood is made from separate layers (pieces of wood veneer) that are glued together using adhesives/resins. To obtain thin pieces of wood, a separate wood veneer is obtained by rotating the logs obtained from the trees. These pieces (veneers/plies) are then stacked one on top of the other and glue is spread over their surface, and these veneers are pressed together using a hot-pressure machine to form plywood sheets.

 

In interior grade plywood, urea-formaldehyde glue (known as UF in the industry) is used to bond the most common types of adhesives, while in exterior grade plywood, phenol-formaldehyde (also known as phenolic resin) is used as the best quality glue.

 

Strength Comparison between Exterior Grade Plywood and Interior Grade Plywood:

External grade plywood is stronger (better glue shear strength) compared to interior grade plywood.

 

Differences in Cost:

Exterior grade plywood is also known as BWR (Boiling water resistant) plywood is costlier than interior grade plywood (which is known as Commercial ply).

 

Resistance to water:

The phenolic adhesive used on exterior plywood is actually a plastic adhesive. Phenol is a material used to make plastics. This adhesive provides excellent water-resistant properties to the plywood. External plywood quality tests often involve immersing the plywood in boiling water for up to 4 hours and then taking it out to test its strength and other properties.

 

For all practical purposes, this type of plywood is considered sufficiently water-resistant, so it can be used outdoors or in the manufacture of kitchen cabinets and more.

 

UF resin, on the other hand, is not as good as phenolic resins, so the interior quality plywood can be damaged if exposed to water. This is the reason it was used indoors (away from the rain).

 

The best way to improve the water-resistance of indoor plywood is to use decorative laminates. These laminates are made using papers impregnated with phenolic and melamine resins, so they have good resistance to water.

 

Also Read: Flexible Plywood | Standard Sizes And Thickness | Uses - Lceted

Also Read: Teak Wood Furniture - Benefits And Drawbacks | Lceted

Also Read: How To Identify Good Teak Wood For Your Furniture? - Lceted

 

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