FREE SHIPPING on new surfboards in the CONTIGUOUS USA + Payment Plans Available

Surfboard Foam: It's What's Inside That Counts

August 19, 2009 1 Comment

When surfing first became popular as a sport 50 odd years ago, surfboards were made out of wood. These surfboards were extremely heavy, easily damaged, and difficult to repair. The surfboards of today are much lighter, float better, are easier to repair, and are capable of great maneuvers on the wave. What's made the huge difference?

Nowadays, the majority of surfboards are made with a foam middle, and then coated with a foam appropriate polyester or epoxy resin.

The foam in the middle of your surfboard does several things. First, it contributes to the board weighing a lot less. Secondly it enables the board to float better (also known as buoyancy). There are a couple of different types of foam that can be used for making surfboards. Either way, these foam inners are known as surfboard blanks. Surfboard blanks are available in a huge range of lengths, thickness and widths.

When selecting a surfboard blank it is a wise idea to choose one that is a bit bigger than the surfboard you are wanting. An inch or two extra in width, and up to no more than 6 inches in length will give the surfboard shaper enough to work with. So when checking out the surfboard blanks be sure you are pretty definite on the finished product.

Surfboard blanks can either be shaped by hand or with machines. The type of foam you select in your surfboard blank will determine whether the final product will be an epoxy surfboard or traditional fiberglass.

Epoxy surfboards are constructed using EPS or expanded polystyrene. (This is the sort of foam that your beer cooler is made from but a lot more dense.) EPS foam blanks require an epoxy resin as the polyester resins destroy the EPS foam.

A traditional fiberglass board has a polyurethane foam core. The foam blank is shaped and then covered with fiberglass and then lastly the polyester resin laminate. Fiberglass surfboards have been around since the 1960's, superseding the wooden surfboard.

Polyurethane foam is the foam most of us think of when we hear the words "Clark foam". So basically, surfboard foam blanks are made from either EPS or polyurethane foam. This in turn determines the sort of resin that will be used in making the surfboard. Epoxy surfboards have EPS cores. Polyurethane blanks are compatible with polyester resins and traditional fiberglass surfboards.




1 Response

tarcica iglasta
tarcica iglasta

May 07, 2014

Great article I’ve just added to my bookmark list.

Leave a comment

Comments will be approved before showing up.


Also in Degree 33 Surf Blog

What Shape Surfboard Should I Get?
What Shape Surfboard Should I Get?

September 10, 2022

Continue Reading

What is a Pop Out Surfboard?  Traditional and Molded Surfboards Explained
What is a Pop Out Surfboard? Traditional and Molded Surfboards Explained

July 30, 2022

Continue Reading

What is the most durable surfboard construction?
What is the most durable surfboard construction?

July 04, 2022

There is a ton of information online about new technology in surfboards.  Each brand has their own terms they use to describe the board they are selling.  You will see lots of terms that make no sense to the average surfer.  Our goal is to break things down to simple terms to help you understand what the differences are in construction which is the explanation of what the board is made of.

Continue Reading