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Polyester (PE): This is the most common resin used in the manufacture of composite material items. The thermosetting resin is in a liquid state at first, to which a small amount of hardener, plus fillers (additives) are added.
- Used for beginner and intermediate levels, in S, M and L sizes
- Long lifespan (5 to 10 years) even with intensive use.
- Excellent value for money
- “Feels like rock” thanks to the sand filler used with it
- Low impact and warping tolerance
- Colour can fade through UV exposure or repeated washing
Polyurethane (PU): Polyurethanes are used in the manufacture of glues, paints, elastomers, foams & fibres. In the 70s, the use of urethane for wheels revolutionised the skateboard world.
PU is the most commonly used resin in climbing halls in the United States. Unlike polyester, it requires small amounts of filler, if any, making the holds very light.
- Used for intermediate and expert levels, in XS and XL to XXXL sizes
- Lightweight, easier to install for large size holds
- Its flexibility allows it to withstand impacts and distortion.
- More expensive than polyester (+50 to +60%)
- Plastic feel
- Colour can fade through UV exposure or repeated washing
- Rapid wear of grain and grip
Fiberglass (GRP):Composite, also known as fibreglass, is used in the aeronautics and marine industries. The process consists of laying several layers of fibreglass or carbon fibre material, depending on mechanical constraints, into a mould. The layers are bonded by injecting resin (polyester or epoxy) to form a composite substance.
- Used mostly in bouldering in sizes XXXL and Mega
- Lightweight, therefore easy to screw on to wall
- Good mechanical and distortion tolerance
- Expensive
- Dry touch, positive texture
Wood: These volumes are made of 15 or 18mm plywood panels. The boards are very precisely cut using 5-axis digital machinery.. They are then assembled, glued or screwed together and then coated in a resin/sand mix. T-nuts are added to the volume surface (25/m²), into which holds can be screwed.
> Pros: The main advantage of volumes is that they can be screwed directly into the wood using VBAs, or T-nut inserts with CHC screws. This brings relief to the route and diversity to the climbing.
> Cons: Wood is a malleable and fragile material. Volumes must be used with care and stored in the right way, or the following types of wear may occur:
- cracks
- chips
- screw holes
- damaged thread
- damaged inserts
Thermoplastic : Part of the TPU (thermoplastic polyurethane) family, its chemical composition means it is recyclable, unlike PU (polyurethane), which has added thermosetting agents.
Ghold combines the 23Carrat thermoplastic with carefully selected additives to make it extremely abrasion-resistant, and at the same time recyclable up to 10 times with no loss of quality.
