The stamps used in the office or for what children place figures after smearing them with ink, they are mostly made with a photopolymer.
This photopolymer is generally found in flat sheets or as a liquid photopolymer.
What is a photopolymer for stamps?
It is a synthetic material (polymer) that by action of light has a change, is its properties, it is photosensitive (polymerization or depolymerization). This light is usually UV (ultraviolet) light which physically modifies the areas exposed to this light.
They are used for many industries, but usually for 3D printing, stamps, or flexo printing.
Where to buy a photopolymer for stamps?
There are many distributors of photopolymer plates worldwide, where they have specialized in creating very high quality polymers such as those used in flexography.
But for stamps, it is not necessary to have such precision, and for this, different formats have been generated that range from areas such as A4 to more than one sheet.
You can easily buy these products on Amazon or MercadoLibre, depending on your country. You can also find the liquid version that is used in some processes.
Suppliers of photopolymer plates
The process of making stamps is a bit tiring, so you should let a company that processes photopolymer in bulk process your photopolymers for your stamps. Cheaper and faster.
How to make a stamp for photopolymer?
If you want to make a photopolymer at home, this video will show you how to do it.
Record the film or photolith
The image to be engraved on the stamp must be pre-recorded on a photolithograph or film (such as x-rays) that does not allow the passage of UV light.
The photopolymer plate is placed on the floor of the insolator and on top of it the engraved film with the printed side in contact with the plate. On them goes the glass that serves to press and increase contact.
Photopolymer Processing – Insolation
With the complete assembly in the position indicated for the first exposure, the light comes on. After a certain time, the light is turned off, the assembly is turned to expose what will be the front of the stamp (previously the "back" was already made). It is exposed to light for a longer amount of time.
The clamps or rubber bands that held the assembly are removed, the glass that was left on top is lifted, the film is removed, then the protective film and at this moment you will be able to see if the work has been successful.
The last step is washing. The mold is in one hand. Open a faucet and let the water (cold or warm) wash the polymer for a few seconds. Then pour a few drops of detergent (dishwasher), with a toothbrush - or similar with soft bristles, rub gently until foaming, rinse and continue brushing adding more detergent.