PBT vs ABS Keycaps
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Keycaps are made from plastic, and the two dominant materials are PBT and ABS. The plastic you choose affects how the caps feel under your fingertips, how they sound, how long they keep their fresh surface, and often how the legends are made. Knowing the difference helps you read product listings and set the right expectations before buying.
ABS is a softer, smoother plastic that is easy to mold and takes crisp, bright colors well. Its main weakness is that the surface tends to develop a smooth shine over time as your fingers polish the high traffic keys. Many people do not mind this, and high quality ABS can feel excellent, but the shine is the trade off that comes with the material.
PBT is a denser, more textured plastic that resists that shine far longer and generally has a slightly grippier, drier surface feel. It tends to sound a touch deeper and more muted than ABS to many ears. Because PBT resists wear, it is often marketed as the more durable long term choice, which is why it appears on many enthusiast sets.
Legends matter as much as the plastic itself. Both materials can use durable legend methods such as doubleshot molding, where a second plastic forms the character so it can never wear off, or dye sublimation, where dye is infused into the surface. Cheaper caps may use printed or pad printed legends that can fade, so the legend process is worth checking regardless of material.
In practice, PBT is the common recommendation for people who want a textured feel and long lasting looks, while ABS remains popular for its smooth feel and vivid colors, especially on doubleshot sets. Neither is wrong. Decide whether shine resistance and texture matter more to you than a silky surface and bright color, and buy the plastic that matches that priority.