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Actually, a good coaster should be somewhat absorbent. Otherwise the water from condensation will run off onto the table underneath, negating the purpose of the coaster. That's why coasters are often made of cork. I have a set of coasters made of sandstone, with a cork base to keep them from marring the surface underneath. The porous sandstone absorbs condensation or spills, then quickly dries out. Sandstone coasters are a popular Arizona gift item, or a souvenir for snowbirds.Coasters that absorb water????? Polyurethane to the rescue!
So the Sako coasters look nice, but the white lettering isn't going to hold up if your glass sweats much.Actually, a good coaster should be somewhat absorbent. Otherwise the water from condensation will run off onto the table underneath, negating the purpose of the coaster. That's why coasters are often made of cork. I have a set of coasters made of sandstone, with a cork base to keep them from marring the surface underneath. The porous sandstone absorbs condensation or spills, then quickly dries out. Sandstone coasters are a popular Arizona gift item, or a souvenir for snowbirds.
Another hazard is that a smooth, non-absorbent coaster can stick to the bottom of a wet glass and then fall on the floor or wherever.
I do have some impervious coasters, which I reserve for use with wine or other drinks where the glasses don't sweat much. I don't use them with beer served in a frozen mug or a well-iced gin and tonic.
I have a set marked "Bofors". Very rare. None imported to USA.