# Best Plate Foam (2026) Source: https://mechkeeblab.com/best/plate-foam Updated: 2026-10-06 Publisher: MechKeeb Lab. Our score is an editorial rating out of 10 (fit 35%, features 25%, build 20%, value 20%), not a customer rating. Method: https://mechkeeblab.com/how-we-research#our-score Plate foam sits between the switch plate and the PCB, filling the gap that otherwise lets keystrokes ping and ring unevenly across the board. By damping that space, it produces a more uniform, slightly muted sound and can take the edge off metallic resonance. Thickness is the key variable, since thicker foam absorbs more and softens the tone further, while thinner foam keeps things subtle. Check switch mount compatibility carefully, because the foam has to accommodate whether your switches clip into the plate or mount directly to the PCB through cutouts. Plate foam suits builders who want a cleaner, more consistent sound without going as far as some of the more dramatic mods, and it is often included in kit-form boards for exactly that reason. It installs during assembly with no special tools, making it a natural step in any from-scratch build. If you prefer an open, resonant sound or love the metallic character of a bare plate, you may want to skip it. For most people chasing a tidy, even acoustic, it is an easy and effective addition. ## Picks ### 1. YIMAGUJRX RUNJRX Keyboard Poron Switch Pads, LE-32 Poron Sound Dampening Foam,Eva Keyboard PCB Modular Foam for Mechanical Gaming Keyboard Our score: 8.4/10 (Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10) YIMAGUJRX RUNJRX sound kit with a full-layout LE-32 Poron bottom sheet, 120 Poron switch pads and 120 EVA modular pieces that fill the gap between the PCB and the plate. Pros: - Three mods in one pack: bottom case foam, switch pads and modular PCB-to-plate foam - Modular EVA pieces fit any keyboard layout with no cutting, according to the listing - Switch pads have a film layer and adhesive backing, and a plastic pry bar is included Cons: - The Poron bottom sheet is not pre-cut and must be trimmed with scissors to fit the case - 120 pads cover a 104 or 108 key board only once, with a small margin for mistakes Details: https://mechkeeblab.com/product/B0BW5L8YG3 ### 2. HONKID Keyboard Foam Sound Dampening Bottom, LE-20 Poron (3mm) Our score: 8.1/10 (Fit for the job 9/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10) HONKID's 3mm LE-20 Poron bottom foam is a middle thickness option for balanced case dampening. Pros: - 3mm thickness balances dampening with fit in most typical cases - LE-20 Poron absorbs case echo and reduces hollow ping - Easy first sound mod that needs no soldering or special tools Cons: - Foam must be trimmed to your case, which takes careful cutting - Check the foam sheet dimensions fit your case before ordering Details: https://mechkeeblab.com/product/B0B4JXKNDQ ### 3. RunJRX Poron PCB Foam 64 Left Layout, Switch Pads 120Pcs and Sound Dampeners for Custom Keyboard Our score: 8.0/10 (Fit for the job 8/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10) RunJRX's current listing of its Poron PCB foam for 64-key left-shift layouts: a pre-cut sheet for the gap between PCB and plate, plus 120 Poron switch pads, a pry bar and tweezers. Pros: - Modular sheet made for the 64 Left layout, so it installs with no cutting on a matching board - High-density Poron with a fine, uniform cell structure that resists compression - 120 adhesive-backed switch pads, a plastic pry bar and tweezers are included Cons: - Fits the 64 Left layout only: other board sizes need a different layout version - No bottom case foam in this pack, so the case cavity itself is left untreated Details: https://mechkeeblab.com/product/B09YGYCG7M ### 4. HONKID Keyboard Foam Sound Dampening Bottom, LE-20 Poron (2mm) Our score: 7.8/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10) HONKID's 2mm LE-20 Poron bottom foam reduces hollow case sound on mechanical keyboards. Pros: - 2mm thickness fits cases with limited internal space - LE-20 Poron is a quality dampening material - Bottom foam reduces echo and hollow ping Cons: - Thinner foam gives less dampening than thicker options - Must be cut or matched to your case size Details: https://mechkeeblab.com/product/B0B151N6V4 ### 5. YIMAGUJRX Keyboard Sound Dampening Foam,Keyboard Foam for Mechanical Keyboard Bottom,Made of LE-32 Poron (3mm Thick) Our score: 7.8/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10) A full-layout sheet of LE-32 Poron, 3mm thick, from YIMAGUJRX. It is cut to size with scissors and laid in the bottom of the case to reduce vibration and hollow sound. Pros: - LE-32 Poron with a fine, uniform cell structure that the listing says resists compression over time - One sheet of about 42.8 x 12.4cm covers 61 to 108 key layouts once trimmed to the board - Includes a plastic pry bar for opening the keyboard case, so no extra tool is needed for that step Cons: - Not pre-cut for any layout: you trim it with scissors to match your case and standoffs - Only one 3mm thickness in this listing, which may be too thick or too thin for some cases Details: https://mechkeeblab.com/product/B0BLTQ5WRR ### 6. DUROCK 0.5mm Poron Switch Pads, Keyboard Sound Dampening Foam (120pcs) Our score: 7.6/10 (Fit for the job 7/10 · Features and specs 7/10 · Build and materials 8/10 · Value 9/10) DUROCK pack of 120 pre-cut Poron switch pads, 0.5mm thick, that sit between each switch and the PCB to buffer the force of every keypress. Peel-and-stick, for soldered and hot-swap boards. Pros: - Pre-cut pads with a mild adhesive backing: peel from the sheet and place on the PCB - Works with both solder and hot-swap PCBs and with 3-pin and 5-pin switches - Listed as compatible with per-switch RGB shine-through Cons: - A per-switch pad, not a full foam sheet, so it does not fill the space between plate and PCB - 120 pads cover one full-size board with few spares, and each pad is placed by hand Details: https://mechkeeblab.com/product/B0BRC2CX72 ### 7. YIMAGUJRX Sound Dampening Foam for Mechanical Keyboard Bottom, Made of YM40-Sponge (10mm Thick) Our score: 7.0/10 (Fit for the job 7/10 · Features and specs 6/10 · Build and materials 7/10 · Value 8/10) A full-layout sheet of YIMAGUJRX YM40 nanosponge, a softer alternative to Poron for filling empty space in a keyboard. It is trimmed with scissors and comes with a pry bar. Pros: - High-porosity nanosponge that the listing describes as softer than Poron with strong sound absorption - One sheet of about 42.8 x 12.4cm can be cut for 61 through 108 key layouts - Plastic pry bar included for opening the keyboard case Cons: - Thickness is unclear: the title says 10mm while the size line lists 0.3cm, so confirm before ordering - Sold as bottom foam, so using it between plate and PCB means cutting switch openings yourself Details: https://mechkeeblab.com/product/B0BLTPFDGW As an Amazon Associate I earn from qualifying purchases.