Mechanical keyboard keycap materials: ABS, PBT and POM compared

Ready to transform your typing experience? The material of your mechanical keyboard keycap plays a crucial role in determining its feel, durability, and visual appeal. This guide unpacks the main types ABS, PBT (polybutylene terephthalate), POM, and several speciality options so you can perform a smart keycap material comparison and choose caps that truly shine.

Different types of keycap materials for mechanical keyboards

Your keycap material choice shapes every press, from the texture under your fingertips to the typing sound that fills the room. The quality of the material directly influences whether the legends fade, the keys develop an unwanted oily shine, or the keyboard maintains its fresh-out-of-the-box charm.

Why keycap material matters on a mechanical keyboard

The types of keycaps installed on a board redefine the entire typing experience, making some plastics feel sleek while others remain grippy. Understanding these differences prevents you from buying caps that quickly become glossy, fade, or produce an unpleasant acoustic profile.

• Tactile feedback: PBT provides a finely textured, firm feel; ABS is smooth and cool to the touch; while POM offers slick, low-friction key travel.
• Acoustic profile: PBT delivers deep, satisfying 'thocks'; ABS produces brighter, sharper 'clacks'; and POM yields a more subdued, muted tap.
• Long-term appearance: PBT resists developing a shine almost indefinitely; ABS is prone to a glossy wear pattern; and POM remains smooth but can show fingerprints.

Choosing wisely makes every session satisfying; choosing poorly means every keystroke reminds you of a costly mistake.

ABS, PBT, and POM at a glance

A comprehensive guide to the different types of keycaps typically starts with these three main types. Each offers unique benefits alongside distinct drawbacks. While all three are thermoplastic materials, their composition, manufacturing processes, and longevity differ significantly.

• ABS (Acrylonitrile Butadiene Styrene): This is a lightweight, inexpensive material that is easy to use for double-shot legends, resulting in bright, durable labelling. However, it is notorious for developing shine over time and can produce a hollow typing sound.
• PBT (polybutylene terephthalate): A denser, more durable, and heat-resistant material known for its rich texture. It boasts exceptional durability and resistance to wear, though it often comes in fewer colour options and is more expensive to mould.
• POM (Polyoxymethylene / Delrin / Acetal): An extremely dense, self-lubricating plastic that provides an ultra-smooth keystroke and a very quiet acoustic profile. It remains less common and generally more expensive.
• Speciality materials: This category includes rubber keycaps, ceramic, stainless steel, and wood veneer. These materials introduce unique grip, weight, or aesthetics but are rarely suited for everyday mainstream use.

Budget-conscious users often gravitate towards ABS, professionals tend to favour PBT for its durability, and gamers frequently select POM for its smooth glide and quieter operation.

Speciality materials beyond the main three

Ceramic keycaps feel cool to the touch, are highly scratch-resistant, and emit a distinct, resonant ping. Stainless steel caps add significant weight and produce a sharp metallic ring with each press. Wood veneer keycaps combine a warm, organic grain with a plastic structure for a unique and distinctive texture.

Rubber keycaps provide aggressive traction thanks to their coated surface, but they can limit the effect of backlighting and may cause finger fatigue during extended gaming sessions. These lesser-known yet commonly used materials truly shine in niche applications, appealing to collectors, artists, or anyone seeking a standout mechanical keyboard experience. However, their cost, comfort, and compatibility limitations generally prevent them from overtaking the mainstream market.

Why PBT keycaps are so highly regarded

In the world of mechanical keyboards, PBT keycaps are held in high esteem because they maintain their matte appearance and resist developing an unsightly shine. Unlike ABS, which inevitably becomes glossy, attracts oils, and shows signs of wear, PBT maintains a sharp, professional look for years on end. This makes it the material for keycaps preferred by heavy typists, office workers, and detail-focused enthusiasts.

Texture, durability, and resistance to shine

The semi-crystalline composition of PBT creates a subtle, matte texture often described as crunchy or grainy that provides a confident, tactile feel with every keystroke. The plastic is highly resistant to skin oils, meaning months of heavy use won't leave a glossy shine on the surface. Since manufacturers produce PBT keycaps with thicker walls (typically 1.5–2 mm), they are better able to withstand hard impacts, maintain stem integrity, and offer outstanding long-term durability that thin-wall ABS sets can't match.

If you drop a keyboard from a desk, these keycaps rarely chip; even after typing thousands of words every day, the stems resist cracking. After years of continuous use, the key legends remain clear, the profile stays true to its original form, and the entire set continues to look almost brand new.

PBT and dye-sublimation legend printing

When PBT is combined with dye-sublimation printing, the keycaps benefit from deeply embedded legends that become part of the plastic itself, rather than just sitting on the surface as fragile ink. The dye permeates the material's structure, ensuring the lettering won't fade, scratch off, or lose contrast even after relentless, high-speed typing. For those who prioritise longevity, this fusion of PBT, dye-sublimation, and robust durability offers a nearly indestructible solution.

Limitations of PBT for backlit keyboards

The primary limitation is light transmission: solid PBT is opaque and blocks light, which obscures RGB LEDs beneath the legends. Some manufacturers do create thin sections to allow light to pass through, but this can compromise the wall thickness and reduce the solid feel that enthusiasts value. As a result, users who desire vibrant backlighting often opt for ABS, while those seeking long-lasting quality tend to choose PBT keycaps for non-backlit or minimally lit builds.

ABS keycaps: strengths, weaknesses, and community debate

ABS keycaps are a mainstay in the mechanical keyboard world. The keycap material is cost-effective, exceptionally easy to mould, and can display vibrant colours that other plastics struggle to match. While fans celebrate these qualities, numerous forum discussions continue to criticise its well-known drawbacks. To grasp the ongoing debate, it's important to explore why ABS inspires such a mix of loyalty and annoyance.

The glossy ageing problem with ABS

Brand new ABS keycaps have a smooth, premium feel. However, finger oils quickly create an uneven shine that many users find undesirable. On mechanical keyboard keycap materials Reddit threads, you'll find repeated complaints about how WASD keys can become slippery within months. This changes the typing feel and makes the board look cheap. Cleaning helps temporarily, but the surface continues to develop a gloss, highlighting ABS's inferior durability when compared to PBT keycaps.

Those with sweaty hands will notice this process accelerates, and even average typists will see shine appear on frequently used rows. Some enthusiasts experiment with matte sprays or frequent cleaning to slow it down, but these temporary solutions only underscore why PBT is more resistant to wear. Simply put, ABS ages very visibly, whereas PBT ages with much more discretion.

Double-shot ABS and GMK keycaps explained

Double-shot manufacturing protects the keycap legends from ever fading. This technique involves moulding a second plastic layer into the first, creating permanent double-shot legends. GMK has popularised this method, delivering unrivalled colour accuracy, crisp fonts, and a distinctive higher-pitched sound that many gamers love. Their mechanical keyboard keycap sets sell out immediately despite their £80–£160 price tags, because while the keycap surface may still develop a shine, the legends themselves will never wear out.

In essence, double-shot ABS provides dazzling colours and indestructible lettering, but the keycap body will still become glossy far sooner than PBT. This has led some hobbyists to commission custom sets that mix PBT keycaps with ABS double-shot legends, aiming for the perfect blend of durability, vivid colours, and a preferred typing feel.

When ABS outperforms PBT

ABS isn't necessarily a worse keycap material; it's just designed for different priorities. Its translucency allows RGB backlighting to appear far brighter than on opaque PBT produced through dye-sublimation. Its flexibility also supports complex colour gradients that are unachievable with PBT. Lower manufacturing costs keep ABS keycaps about 30–50% cheaper, making them a more accessible entry point for those building on a budget.

Collectors searching for rare colour schemes, or gamers who favour loud, responsive acoustics, will often prefer ABS over PBT. When aesthetic flexibility, the brilliance of double-shot legends, and a lower cost matter more than long-term durability, ABS remains the mechanical keyboard keycap material of choice.

POM keycaps, keycap profiles, and choosing the right material

POM occupies a unique middle ground: it offers a smoother typing feel than PBT, boasts superior durability over ABS, and is significantly rarer than either. It is highly sought after by gamers pursuing ultra-responsive, silent builds and enthusiasts who appreciate uncommon plastics. When you pair POM keycaps with a complementary keycap profile, the overall mechanical keyboard typing experience can be dramatically enhanced.

What makes POM unique among keycap materials

POM (Polyoxymethylene, often sold under the brand name Delrin) is a dense yet slightly flexible keycap material that provides an exceptionally slick typing feel. Many users describe its surface as 'silky'because fingers glide across it with minimal friction. When combined with silent switches, the keyboard remains exceptionally quiet. Unlike many sculpted keycaps in OEM or Cherry profiles, this low-friction characteristic is consistent across all keycap profiles, ensuring the benefit is always present.

• Ultra-smooth surface: Provides a smoother glide than both ABS and PBT, enhancing rapid actuation for competitive gaming.
• Quiet keystroke: Among all keycap material options, POM produces the softest sound signature, making it ideal for office or night-time use.
• Excellent durability: Its wear resistance keeps the surface slick for years; it will not develop an oily shine like ABS, nor will it roughen the way some PBT keycaps can.
• Semi-translucent quality: Allows light to pass through more effectively than most ABS or PBT sets, making RGB lighting effects truly pop.

The downside to the same smooth finish is that it tends to show fingerprints easily, which may require more frequent cleaning to keep the keys spotless. Most users consider this a minor trade-off for the performance benefits, but perfectionists should be mindful of this trait.

Keycap profile compared: OEM, Cherry, and XDA

The keycap profile you select impacts ergonomics just as much as the keycap material. OEM profiles feature tall, sculpted keycaps with pronounced angles, making them ideal for gaming or hybrid use. Cherry profiles retain the sculpting but at a lower overall height, creating a gentle curve that many touch-typists prefer. XDA profiles are entirely flat and uniform, a favourite among those who appreciate clean aesthetics and a consistent typing feel. Since POM keycaps are available in all these shapes, you can prioritise either the material or the profile and still achieve an excellent combination.

Material and profile work in tandem. PBT keycaps in a Cherry profile combine durability with comfortable sculpting. ABS keycaps in an OEM profile are common in value-focused RGB gaming setups but are also the quickest to develop shine. POM keycaps in an XDA profile offer silent keystrokes with a gallery-worthy appearance. Your ultimate typing experience is only achieved when both the keycap material and the keycap profile are perfectly matched to your usage habits.

Which keycap material should you choose?

Your choice ultimately depends on your priorities, so consider what matters most before purchasing.

• Pick PBT if you value durability, dislike glossy shine, prefer a matte texture, and share your mechanical keyboard with others.
• Pick ABS if a low price, vibrant RGB effects, a huge colour selection, and a smooth out-of-the-box feel are more important than long-term wear resistance.
• Pick POM if you want ultra-smooth, low-friction strokes, near-silent operation, translucent legends, and top-tier gaming responsiveness that POM keycaps provide.
• Pick speciality blends if you collect boards for their unique acoustics or value artistic expression over raw practicality.

Remember to consider every component, switch weight, stabilisers, keycap material, and sculpted keycaps profile as they form one cohesive system. A heavy-fingered typist with moist hands using silent switches will appreciate PBT keycaps. A budget-conscious builder obsessed with RGB will likely choose ABS despite its tendency to develop shine. A competitive FPS player chasing microsecond advantages gains an edge with POM. When your choices align with how you actually use your keyboard, your mechanical keyboard will perform exactly as you envisioned.

Frequently Asked Questions