Is cork better than wood, acrylic or rubber for coasters?

What actually decides it

A coaster has one job, which is to sit still under a wet glass and protect the surface underneath. So the useful comparison is not which material is nicest, it is which one behaves well when it gets wet, because that is the condition it lives in.

Cork's cell walls are about 53% suberin, which is hydrophobic, and its friction rises as the surface gets damp. Most alternatives do the reverse.

Where each one wins and loses

• Cork grips harder when wet, does not rot or waterlog, feels warm, is light, takes a logo three different ways, and is renewable. It dents under a point load, and strong sun fades it.
• Acrylic is waterproof and cheap to produce, and it wipes clean. It feels cold, it scratches, a wet glass slides on it, and it is plastic in a room where the buyer is often trying not to be.
• Wood looks warm and takes engraving well, but it needs sealing, and unsealed it stains and can warp with repeated wetting.
• Rubber and silicone grip well dry and are easy to clean, but grip falls away once a film of water sits between the glass and the surface.
• Stone and ceramic look premium and are genuinely waterproof. They are heavy, they feel cold, condensation pools rather than being absorbed, and a chipped edge can meet glassware.

When we would tell you not to use cork

If the coaster has to go through a dishwasher, or live outdoors in unshaded sun, cork is the wrong choice and we would say so. Hot detergent attacks the binder and the finish, and UV fades the surface unevenly.

Water is not on that list, and it is worth saying because most people expect it to be. For a bar top, a cafe table, a hotel room or a desk, the wet-grip behaviour is the whole argument and it is a real one.

The practical difference for a business

Cork takes branding three ways, engraved, screen printed or full colour, so a logo is a normal part of the order rather than a special process. It is also light, which matters more than it sounds when a hotel is shipping a few thousand of them.

Are cork coasters better than acrylic?

For a wet glass, yes. Cork's grip increases as it gets damp, while a wet glass slides on acrylic. Acrylic wins in one place only, which is where a coaster has to go through a dishwasher, because hot detergent attacks the binder in agglomerated cork.

Do cork coasters stick to the glass?

They can lift briefly with a very wet glass, as any absorbent coaster can, but cork grips the TABLE harder as it gets damp, which is what stops the coaster sliding around in service.

Are cork coasters good for a bar?

Yes. A bar is the condition cork handles best: constant condensation, wiping down and wet hands. Cork grips harder as it gets wet, where acrylic, stone and rubber all lose grip once a film of water forms.

What is the downside of cork coasters?

It dents under a sharp point load, and strong direct sun fades it unevenly over a few years. It should not go through a dishwasher, because hot detergent attacks the binder. Water itself does not harm cork.