iFixit ran more tests and took a closer look at the keyboard membrane that was added to the 2018 MacBook Pro released last week. It turns out, the membrane is one sheet of die-cut silicone with tiny cutouts to allow keycaps to connect to the butterfly switches beneath.
To test how well the new design holds up against dust, iFixit sprayed a new MacBook Pro with a dusting of paint additive. They then tore apart the notebook and found:
Lo and behold, the dust is safely sequestered at the edges of the membrane, leaving the mechanism fairly sheltered. The holes in the membrane allow the keycap clips to pass through, but are covered by the cap itself, blocking dust ingress. The previous-gen butterfly keys are far less protected, and are almost immediately flooded with our glowing granules. On the 2018 keyboard, with the addition of more particulate and some aggressive typing, the dust eventually penetrates under the sheltered clips, and gets on top of the switch—so the ingress-proofing isn’t foolproof just yet. Time will tell how long the barrier will hold up.
iFixit followed up by testing with grittier sand, which managed to cause keys to stick.
It’s good to see that the MacBook Pro’s keyboard withstands fine particles better than earlier models in testing. The real test, of course, is long-term human testing. Only time will tell whether the 2018 MacBook Pros can hold up when faced with a crumbly muffin in your local café or the pollen blowing across your keyboard as you browse the web in your backyard.