What is a photosensitive film?

It is called Photosensitive film or Photographic film or PCB mask also known as dry film. This sheet is used to produce high quality PCB tracks in a simple and clean way. Just stick it on top of the PCB, it will become a sensitive circuit board.

What is dry film resist?

Dry Film is a photo-resist, when strong UV light hits it, where the light hits, it hardens and this hardened form resists etching solutions. The film is comprised of three parts, the blue layer is in the middle, this is the polymer which hardens with UV, on each side of this polymer is a protective transparent film.

How do you use photoresist?

DIY PCB Using Liquid Photoresist

  1. Step 1: Supplies. Gather the supplies needed.
  2. Step 2: Paint. I got the photosensitive paint off ebay.
  3. Step 3: Expose. If the coating looks too thin after drying, apply a second coat and let it dry out.
  4. Step 4: Develop.
  5. Step 5: Etch and Strip.
  6. Step 6: Done.

What is photoresist etching?

The photoresist serves as a masking layer for etching into the oxide. An acid etch is used to remove the oxide in the exposed regions, transferring the pattern to the oxide layer.

What is Presensitized PCB?

PRESENSITIZED PCBs: Also known as photopositive PCBs or photoresist PCBs, are regular PCB copper clads, layered with a light sensitive paint or film. Once exposed to light, the paint would dissolve in the developing solution, while the unexposed areas would remain undissolved in the solution.

Why is photoresist used?

A photoresist (also known simply as a resist) is a light-sensitive material used in several processes, such as photolithography and photoengraving, to form a patterned coating on a surface. This process is crucial in the electronic industry.

What is wet film resist?

Wet film represents photosensitive liquid resist, the tackifying resin is introduced to improve the comprehensive acid and alkali resistance of the resist, it generally exhibits a blue viscous liquid.

How do you develop a photoresist?

Photoresist processing, or simply resist processing, basically consists of six steps: 1) dehydration and priming; 2) resist coating; 3) soft baking; 4) exposure; 5) development; and 6) post-development inspection.

What process is commonly used for etching?

Etching is traditionally the process of using strong acid or mordant to cut into the unprotected parts of a metal surface to create a design in intaglio (incised) in the metal. In modern manufacturing, other chemicals may be used on other types of material.