Coating Material Filter Element
Coating material filter element is belong to the membrane filter cartridge, it is composed entirely of pleated polypropylene microfiber which provides great filtration performance with a low cost. Characteristics include high flow rates, dirt holding capacity and filtration efficiency making it the ideal solutions for the pre-filtration of liquids.
- High filtration efficiency
- Broad chemical compatibility makes it suitable for acids, bases and solvents
- Available in nominal rating from 0.1um to 100 um for precise particle removal
Physical vapor deposition (PVD) is the process in which a solid material is heated and passes directly from a solid to a gas (sublimation) and then back again to a solid state as it condenses on a given substrate, usually while under vacuum.
The traditional approach has been to use a resistive heating element to evaporate the materials. The thermally-prepared coatings were Omega’s bread and butter business for over 25 years.
To protect and preserve these filters for long-term stability, they are typically laminated with a coverslip after preparation. Although they have fallen out of favor recently, they still offer several advantages over surface coatings.
Because the range in refractive index is much higher amongst these materials when compared to oxides, a much thinner coating stack can achieve similar results.
This reduces stress on the substrate, and can minimize wavefront distortions. This becomes particularly important as the wavelengths of interest move into the infrared, where thicker layers are required.
These optical filters offer deep out-of-band blocking with low residual stress and stable spectral performance.