Useful combination of physical, electrical and chemical properties.
MIL-SPEC. I-46058C Approved and UL94 V-0 Approved.
Non-halogen. Good for medical applications.
High electrical properties.
The products to be coated must first be cleaned and masked and are then placed in the deposition chamber. One important fact about parylene coating and the reason it is so advantageous is that the coating applications are done at room temperature. Next, dimer is then placed in a glass tube in an aluminum foil cup called a “boat”.
The process then begins when an end cap is placed over the glass tube. Dimer is then changed from a solid into a vaporized gas because of reduced pressure at the other end causing the molecules to move down the tube. In the pyrolysis zone, the gas is heated to higher temperatures (680oC) and then cleaved into the reactive monomer, para-xlylyene, which is critical for the process. The monomer molecules then enter the deposition chamber and re-form as a long-chain polymer on all exposed surfaces.
Film growth then continues in the deposition chamber creating a coating surface that is pinhole free and is able to reach the deepest crevices and the sharpest edges in uniform manner.
A cold trap is used between the deposition chamber and the vacuum pump to prevent parylene molecules that did not deposit in the chamber from reaching the vacuum pump. It also prevents “backstreaming” of oil molecules into the deposition chamber.