Short answer: A good acrylic coaster is 4 in. (100 mm) across and 1/4 in. thick: heavy enough not to stick to the bottom of a glass and stiff enough to stay flat. Use 1/8 in. for lightweight favors or coasters that sit in a holder, and engrave the back of clear coasters so the design can't wear off.
What size and thickness to choose
Most coasters are 3.75 to 4 in. (95 to 100 mm) across. That covers a standard mug, a pint glass, and most wine glasses, with a little margin so drips land on the coaster and not the table. Go up to 4.5 in. if you use wide tumblers or stemless glasses with a big foot.
- 1/4 in. is the everyday choice. It has enough weight to stay put when you lift a glass, it doesn't flex, and the edge looks substantial.
- 1/8 in. works for party favors, coasters that live in a holder, or layered designs where you glue a second shape on top. They are light, so a wet glass can lift one off the table.
- 3/8 in. gives a chunky, premium look for gift sets and corporate pieces. Clear 3/8 in. with polished edges looks like a slab of glass.
Shapes that work
Circles and rounded squares are the classics. We can also cut hexagons that nest together in a holder, state or country outlines, logo shapes, or slices with a wood-grain pattern engraved in. Keep any shape at least 3.5 in. across at its narrowest so a glass doesn't tip off the edge. If you have your own outline, upload the drawing and the quote prices the exact shape.
Colors and finishes
| Look | Material | Thickness |
|---|---|---|
| Glass-like | Clear cast, back-engraved | 1/8 to 3/8 in. |
| Soft, hides water spots | Frosted | 1/8 to 3/8 in. |
| Bold contrast | Black or white with engraving | Any |
| Bright and playful | Red, blue, green, yellow, or fluorescent | 1/8 or 1/4 in. |
| Metallic | Mirror silver (1/8, 1/4); gold or rose gold (1/8) | See left |
Frosted is the practical pick for coasters that get used daily: condensation rings and fingerprints show far less than on clear. Mirror acrylic looks striking but shows every scratch and water spot, so treat mirror coasters as decor or event pieces.
Engraving that lasts
Glasses slide across a coaster thousands of times. Engrave the top face and the design slowly polishes away; engrave the back of clear or frosted acrylic and it sits safely underneath, seen through the material. That is called reverse engraving, and it's what we recommend for clear coasters. On black or colored acrylic, a front engraving reads as a frosted gray mark and holds up well because it's cut into the surface. More about our engraving options, including color-filled designs.
Tip: add small adhesive cork or felt dots to the bottom. They stop the coaster from scratching the table, keep it from sliding, and lift it slightly so it doesn't suction to a wet surface.
Heat and care
Acrylic is fine for cold drinks and a hot mug of coffee or tea. Its continuous service limit is about 160 to 180 °F (71 to 82 °C), and a mug's base is cooler than the liquid inside. Don't set a pot straight off the stove or a baking dish on one; for that you want a trivet in metal, stone, or cork.
Wash coasters by hand with mild soap and lukewarm water. Dishwasher heat and harsh detergent can cloud or warp them over time; see can acrylic go in the dishwasher. Skip Windex-type window sprays, solvents, and full-strength alcohol wipes, which can cause fine cracks called crazing.
Design tips
- Round the corners of square coasters to at least 0.25 in. so they don't chip when dropped.
- Keep engraved text at least 0.15 in. tall and leave a 0.25 in. border so nothing reads cramped at the edge.
- For a set, order one or two extras. They are small and easy to lose.
- A matching holder can be cut from the same sheet: a base plus two slotted sides that press-fit together without glue.
Questions
Can you put a hot mug on an acrylic coaster?
Yes. A mug of coffee or tea is well within what acrylic handles. Avoid pots, pans, and anything straight from the oven, which can soften or mark the surface.
Do acrylic coasters absorb condensation?
No. Acrylic doesn't absorb water, so moisture beads on top until you wipe it. A shallow engraved ring or frosted finish helps hide it, and cork backing keeps the coaster from sticking to the glass.
Can I order coasters for an event or business?
Yes. Quantity pricing applies automatically in the instant quote, and logos engrave the same on every piece.