PU or EPS: Which one is best?
When ordering your next board, you are going to have to make a decision between going with standard PU (polyurethane blank) or EPS (Expanded Polystyrene, otherwise known as styrofoam).
Haydenshapes - Hypto Krypto and DHD -Black Diamond with a PU blanks compared to their EPS construction versions.
Brief history of Surfboard Blanks
In the late 50’s Hobie Alter began playing around with different PU formulas to make a blank that would be easier to shape and produce than using Balsa wood. This became a turning point in surfboard manufacturing as the foam was much easier to shape and more constant to work with. The weight of boards dropped and the performance levels went through the roof.
Soon after that, Hobie had a full blown factory pumping out PU blanks and had appointed Gordon Clark to help with the endeavours. Eventually, Gordon would take over the blank manufacturing so Hobie could focus on building surfboards, and as a result, Hobie Surfboards had become the first mass manufacturers of surfboards paving the path for the surf industry as we see it today.
In 2005 Gordon Clark's Foam factory was wiped out by a horrific fire and ceased operations. With no other dominant PU manufacturers to quickly fill the void, EPS made a jump forward as a viable option for board builders. As they had to wait and test through the issues of new PU foam formulas from new blank manufacturers.
Although EPS had been used by some since around the 70’s or earlier, it took this major blank disaster to get the majority of board builders to start using the alternative.
Left (top): Gordon Clark in his Foam Factory, mid 70's. Right (Bottom): Clark Foam 2005 after the disaster fire.
This day in age, however, EPS foam blanks have become a regular option for most of the surfboard industry. The performance attributes, though slightly different than PU, are just as notable.
Now, even the top level elite surfers will sometimes prefer to use EPS/Epoxy boards over PU/PE for certain waves or conditions.
They are both great options, but for us regular surfers who can’t afford an endless quiver, we need to think about these differences and make an informed decision before ordering our next board.
PU / PE Boards
PU as a construction refers to a surfboard built from a Polyurethane blank with Polyester resin, whilst PE refers to a Polyurethane Blank with Epoxy resin.
These have long been the standard for most brands, and is the most widely and affordable options still out there. Due to the foams weight and density PU / PE boards sit a little lower in the water, helping to keep your rail under, giving you a nice “knifey” feel when slicing through the waves face.
Being a touch heavier also helps them to handle choppy conditions better and are less prone to being bounced around. Sitting lower in the water also has its benefits to barrel riding, providing more hold in hollow waves.
PU / PE is cheaper.
This is often the determining factor for most people. EPS constructions are more expensive for the manufacturers which results in them costing a little more than your standard PU.
Diagram of the Haydenshapes PE Construction.
EPS is a popular option for many brands these days and for a number of good reasons. One of the most notable differences between EPS and PU is the weight.
EPS foam is much lighter than PU which makes for a great option for the surfers that love to take it to the air. Lighter boards are easier to whip around quickly, this extra sensitivity makes them great for progressive surfing on waves that let you perform quick snappy manoeuvres.
They also have a more buoyant feel to them, as if they sit a little more on top of the wave. This can be beneficial for building speed faster also making it become easier to glide through flat sections. The combination of these factors has made them a great option for small wave boards.
Diagram of the Haydenshapes Future Flex Construction utilizing a stringless EPS blank and carbon fibre.
EPS is more environmentally friendly.
Unlike PU, EPS be recycled. Making it the obvious choice for sustainable surfboard manufacturers and surfers alike.
You will find this foam in the core of all eco-friendly surfboard constructions. Often combined with bio resin and fibreglass alternatives such as flax cloth.
For more eco-friendly alternatives, see our Sustainability Page.
Epoxy resin is the only resin that can be used on EPS foam. It’s a little stronger than and also more flexible, allowing it to snap back into shape better than Polyester which is a little more brittle and can lead to cracking.
Julian Wilson boosting on his JS - Air 17 in PU and Air 17 Hyfi (EPS Construction). Same board, different constructions.
Which one’s for you?
Now that you have a better idea of what attributes the different blanks possess, you should be able to make a better decision when ordering.
All brands have different Surfboard Construction types you can choose from.
Our goal is to help inform you so you can make the right decision for your next custom surfboard and make sure you are as stoked as possible.
There is a lot more to go into with Surfboard Constructions, so for more info and for any questions get in touch via the link below.
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