Are Tactile Switches Washable?

A tactile switch is washable only if it is sealed for it. A washable, or process-sealed, tact switch is sealed well enough that the contacts survive the aqueous or solvent cleaning step in PCB assembly, while a standard, unsealed tact switch is not: washing it lets cleaning fluid carry dissolved flux into the dome, where it dries and leaves a residue that causes intermittent or dead contacts. The common industry benchmark is that a process-sealed switch is sealed to at least IP67, meaning dust-tight and able to survive immersion in 1 m of water for 30 minutes (IEC 60529), which covers a typical PCB wash. The point most often missed is that “washable” and “sealed for the field” are not the same claim: washable describes surviving the factory clean, while an in-service IP rating describes the environment the finished product faces.

The word “washable” trips people up because it sounds like “waterproof,” and the two are answered by different specs. A switch can be process-sealed for the cleaning line and still be the wrong choice for an outdoor product, and a switch can carry a high IP number and still fail in production if the board is washed the wrong way. The failure is quiet: an unsealed switch that took a wash often works on the bench and then drifts to intermittent weeks later, once the trapped residue dries. What follows is how to read the three sealing claims apart, and the handful of wash-process rules that decide whether a sealed switch actually stays sealed.

What “washable” and “process-sealed” actually mean

A standard tactile switch is built open: air moves freely through the housing, which keeps it cheap and crisp but also means a cleaning wash flows straight in. Manufacturer precaution sheets are blunt about it: a switch that is not sealed cannot be washed, because the washing agent and the flux it carries enter the switch and cause contact failure. So “washable” is not a feature you can assume; it is a specific construction you have to ask for.

Process-sealed is that construction. The body is sealed, commonly to the minimum of IP67, so cleaning fluid stays out of the contact area during assembly. Makers do this in one of a few ways: a silicone rubber stem or boot over the metal dome, a thin polyimide or polyester film bonded over the dome on low-profile parts, or epoxy potting around the terminals. On a washable part, the datasheet says so in plain words (“sealed,” “process sealed,” or “washable”) and usually states the cleaning agent it tolerates, often an alcohol-based solvent rather than an aggressive one. If the datasheet does not claim a seal, treat the switch as not washable.

Before you ask for that seal, check whether you actually need it. If your line uses a no-clean flux and has no cleaning wash, a standard switch is fine, and a sealed one only adds cost for protection the process never tests. The washable spec earns its place when the board is genuinely washed, or when the finished product faces moisture in service, not by default.

Washable vs sealed vs IP-rated: three different questions

These three terms get used interchangeably, and that is where designs go wrong. They answer different questions:

• Washable / process-sealed answers “will it survive my assembly cleaning step?” This is a manufacturing concern, sealed to roughly IP67 as a floor.
• Sealed for service answers “will it keep moisture and dust out in the product’s working environment?” This is a field concern.
• The IP number (IP54, IP65, IP67, IP68, IP69K) is the measured grade behind both, and the tests differ.

A part can satisfy one and not another. A process-sealed switch handles the wash but may not be specified for sustained outdoor immersion; a part rated for a damp panel may not be cleared for high-pressure jet washing. The IP ladder shows why: IP54 resists splashes, IP65 a water hose, IP66 strong jets, IP67 temporary immersion, and IP68 or IP69K continuous immersion or high-pressure hot-jet washdown. Important caveat from the standard’s own logic: an IP67 mark does not promise zero ingress under high-pressure jets, hot detergents, or extended deep immersion. Match the claim to the actual duty, the wash on the line and the environment in the field, and read the IP figure as a tested grade, not a synonym for “waterproof.”

The wash rules that keep a sealed switch sealed

Specifying a washable switch is only half the job; washing it correctly is the other half, and a sealed part can still take on fluid if the process ignores a few rules:

• Let the board cool before it goes in the wash. Manufacturers commonly advise washing only after the board has cooled to room temperature, since a hot sealed switch can draw cleaning fluid past the seal as it cools. Do not run a board into the wash straight out of reflow.
• Keep flux below the board surface (through-hole parts). If flux rises above the PCB onto the switch mounting face, it can wick into the body before the wash even starts.
• Use the cleaning agent the datasheet allows. Washable models are typically rated for alcohol-based solvents; aggressive chemicals can degrade the silicone seal and quietly lower the IP grade.
• Respect the soldering limits. Over-temperature or over-time soldering can distort the seal or the dome; follow the stated profile (for example, a through-hole limit around 260°C for a few seconds).
• Verify after a process change. A new flux, solvent, wash temperature, or board thickness is a reason to re-test a sample, not to assume the old result holds.

None of these rules appears on the headline “washable” line, and each is a common way a genuinely sealed switch still ends up with residue inside. The seal sets the ceiling; the process decides whether you reach it.

The feel cost of sealing

Sealing changes the click, and a design that ignores this ships a button that feels wrong. A silicone stem or boot works as a gasket over the metal dome, but it also dampens the dome’s sharp snap, so a sealed switch usually feels softer and quieter than an open one. The thin-film method keeps more of the original snap but seals a shorter stroke, so it suits low-profile parts rather than tall actuators.

That makes sealing a feel decision as much as an environmental one. If crisp tactile feedback matters, expect to tune the operating force and the cap to recover the click the seal softens, or to choose the film method where the body height allows it. This is the part most easily overlooked when a standard switch is swapped for a sealed one late in a design, and it is cheaper to plan for than to discover at the prototype stage.

Where washable and sealed tact switches are used

Washable and sealed tact switches show up in two distinct cases. The first is purely a manufacturing one: a board that gets cleaned after soldering needs at least a process-sealed switch even if the finished product never sees water. The second is environmental: outdoor and handheld equipment, washdown food and medical devices, appliance and HVAC controls, and security and access panels all face moisture or dust in service and call for a genuine IP-rated seal, with the level following the exposure.

One time-related point belongs here: an IP67 rating describes the switch when new, not across the life of the product. Seals degrade under UV, temperature cycling, and mechanical wear, so a part rated IP67 can drop to a lower grade over years of heavy outdoor use, which is a reason to specify for the duty rather than the headline figure. Swiclick supplies IP67-sealed tact switches in its KAN6xxx series and select KAN0xxx parts such as the KAN0811, for appliance, security, and industrial designs, sealed to IP67 rather than to a higher class it does not build.

Specifying or second-sourcing a washable tact switch

When you specify or cross-reference a washable or sealed tact switch, read three things on the datasheet, not just the word “sealed”: the seal method (boot, film, or potting), the IP grade and the test it was measured against, and the operating force and feel after sealing. Replacing one sealed switch with another is footprint-and-spec work, not a guaranteed drop-in, because two sealed parts of the same size can differ in seal method, stroke, post-seal force, temperature range, and IP level. A supplier who promises a blanket drop-in for a sealed part they have not seen is offering optimism, not a switch that survives your wash.

Swiclick is one manufacturer of process-sealed and IP67 tact switches, and publishes its datasheets without a form, so the seal method and the IP basis are there to read. If you need a sealed switch for a washed board or a moist environment, see Swiclick’s IP67 tact switches and the wider tact switch range; if you are matching a specific sealed part, send the datasheet and the wash your line runs, and an application engineer will confirm the sealing level and feel before you commit a board.

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Written by Eric Chen, Application Engineer, Swiclick.