Custom Silicone Rubber Keypads: Options for Labeling

If you are in the market for a custom silicone rubber keypad, then there are a few things to consider when it comes to labeling. Namely, what type of labeling will be most effective for your specific application? In this post, we will take a look at five different ways to label a silicone rubber keypad. So, which one is right for you? Let's find out!

Table of Contents

Top 3 Options for Labeling Custom Rubber Keypads

It’s easy to operate a keypad-based human-machine interface if the function of each key is indicated. Readable and accurate labeling that cannot be easily damaged by moisture or scratching is essential. Here are our top 5 options for labeling a molded rubber keypad.    

Screen Printing

keypads silkscreen printing

Screen printing, or serigraphy, is one of the world’s oldest technologies for silk-screening letters and images. It is an excellent method for printing letters and graphics on consumer and industrial products.

Screen printing of rubber keypads is cost-effective compared to other methods, making it one of the most popular options for labeling silicone rubber keypads.

A screen mesh or fabric is tightly stretched onto a rectangular or square frame. The screen mesh may be polyester, cotton organdy, nylon, or silk. A stencil is used only to expose keytops and block the rest of the rubber keypad. The stencil design depends on the layout of the silicone rubber keypad.   

A squeegee is used to push and spread the ink through the silicone rubber keypad when ink is deposited onto the screen and the frame assembly.   

Silicone-based ink

Silicone-based ink delivers long-lasting results when labeling keys on silicone custom rubber keypads. However, non-silicone-based ink can also be used for silk screening. However, the quality of the print may not be good enough for high-traffic silicone rubber keypads. The letters may fade and peel depending on the actuation force of each key. 

The manufacturer can use an epoxy coating to prevent the labeling from fading to protect the silk-screened keys. An epoxy coating gives the keys a glossy appearance and a hard plastic feel.    

Suitable for industrial and consumer productsNon-silicone-based ink may fade quickly 
It can be used on membrane switchesMulticolor printing may be labor-intensive and time-consuming
Suitable for both silicone and non-silicone-based inks 
Produces an excellent printing effect on silicone keypads 
An excellent method for printing remote controls 

Laser Marking

Laser Etching
Laser Etching

The popularity of laser marking and laser cutting is increasing in manufacturing elastomeric keypads.

Laser marking, also called laser etching, is a unique process of labeling silicone rubber keypads using a high-powered laser. This method works by generating contrast in materials to convey information. It is the ideal method to use for backlit rubber keypads.

Usually, most custom rubber keypads are labeled using screen printing because it is cost-effective and easy for mass production. Laser marking is a newer and more advanced labeling technique that can be used in industries ranging from keypads to food equipment.

This labeling method is easiest to use on custom keypads with backlighting features. Unlike silk screening, laser marking takes place entirely without contact. While the exact labeling process varies from manufacturer to manufacturer, the technology removes the black coating on the upper layer of a rubber keypad.

keypads with backlighting features.

A rubber keypad manufacturer can use two laser marking techniques for labeling – galvanometer and flatbed lasers.

In the first method, direct writing is done by steering a laser beam with galvanometer-driven mirrors. This technique continuously marks vector-style characters and texts very fast. The marking is usually smooth and relatively quick. On the other hand, flatbed lasers use a lens equipped with a fixed mirror to effectively direct the beam on the keytop of a rubber keypad.

Silk screening may be cheaper. However, the simplicity of manufacturing laser-etched rubber keypads, the speed of application, and the permanence of the texts and characters have opened up a considerable appetite within the industry.

Flexible in text and character design and applicationInvolves high investment costs
Non-contact technology means no clampingThermal load is exerted on the rubber keypads
Laser-etched rubber keypads are aesthetically appealing.Requires a skilled operator for practical application
The texts and characters don’t fade easily 
It can be used to mark a membrane switch. 

Plastic Caps

Silicone Rubber Keypad Plastic Caps

Another trending method for labeling a custom rubber keypad is plastic caps. Rubber keypads labeled using this method are called Plastic + Silicone Rubber Keypads or P+R Keypads. This is one of the most expensive labeling solutions in manufacturing silicone rubber data input devices with backlighting effects.

A silicone rubber keypad with plastic caps offers several advantages, including superior aesthetic effects, improved oil, dust-proof surface, and increased wear resistance. The plastic caps are attached to the rubber keys using elastomeric sealing.

The most popular materials used in the production of plastic caps are PBT and ABS. PBT is generally preferred over ABS because it produces stiffer and more durable caps. A manufacturer of rubber keypads usually produces plastic caps through injection molding.  

Once the plastic caps have been produced through injection molding, they can be laser-etched or silk-screened. The caps are then assembled on the silicone keypad by glue.

Allows for pleasing aesthetic and backlighting effectsHigh tooling costs for injection molding, positioning toolings, and die-cutting tooling
P+R keypads have an incredibly long lifespan, making them great for high-traffic applicationsNot the most economical option for low-quantity P+R keypad production
Produce a highly versatile and user-friendly interfaceProcessing and assembling the plastic caps may need a lot of labor
Plastic caps can be labeled with different methods, allowing for superior customization   
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Tips on Choosing the Proper Labeling Method for Your Keypads

keypad labeling

As you have seen, all the popular rubber keypad labeling options have certain downsides. This means you’ve got to consider a few things when selecting a labeling method. Here are a few tips to help with the selection:

Cost-Effectiveness & Labor

A keypad-based human-machine interface must have accurate labeling to properly operate a computer or electronic device. However, the manufacturer must also consider the costs of the labeling process. This can include the cost of materials, the cost of tools, and labor costs. The most economical method that is used by most industries is silk screening. However, a manufacturer with a higher budget could consider the more advanced options for better quality and durability.

Keypad Design & Aesthetics

The keypad’s design also matters, including membrane switches and metal domes.

Membrane keypads have an electrical contact on the underside that connects with the board when a key is pressed. A membrane keypad uses a metal dome to provide a tactile feel. The ideal labeling option for this keypad design would be silk screening.

On the other hand, metal dome keypads have a metal dome and two circuits. Metal domes have an excellent snap ratio when pressed for better tactility. All the labeling above methods would be ideal for a metal dome design.

Some industrial or consumer applications may call for backlighting. In this case, laser marking would be the most preferred labeling technique. However, laser marking can be integrated with silk screening to introduce back-lighting effects into silicone keypads.

For customization of colors and aesthetics, a manufacturer can consider plastic caps. But silk screening can still be used with color customization.

Membrane keypads

The Durability of the Labeling Method

As we mentioned earlier, the importance of keypad labeling is to identify the function of each key. So, choose a method that will be a good fit for the application.

Silk screening or silk screen printing is the cheapest, but it is usually criticized for its low durability. Silk-screened keys are known to be susceptible to scratching. Therefore, this labeling method may not be the most convenient option for high-traffic applications. Laser-etched keys, however, don’t fade quickly and can withstand repeated use.

Plastic caps are also ideal for high-traffic applications, but it depends on the labeling method used on the lids.  

For medical applications, the labeling method needs to have good chemical resistance. This is so because medical settings usually use chemicals to clean surfaces. Some labeling solutions can be covered with epoxy coating to make them chemical-resistant. 

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Final Words

Most silicone rubber keypad layouts are the same in many applications. But it’s always easier for a user to have an adequately labeled keypad.

There is more than one labeling option, depending on the budget, expected lifespan or durability, and back-lighting and aesthetic effects. Hongju Silicone is specialized in all of the labeling options mentioned above. We’ve also got some of the unique customization techniques in the industry.

Buy High-Quality Silicone Rubber Keypads from Hongju

Visit our website to discover more about Hongju Silicone and our expertise in providing high-quality silicone rubber products. Whether you need custom rubber keypads or have specific requirements, contact us; our team is here to assist you. We’ll work together to compromise cost-effectiveness and critical label life. 

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Hey there, I’m David!

I’m the founder of Hongju Silicone. I have been in this field for more than two decades. If you are looking for custom-made silicone rubber products, feel free to ask me any questions.

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