The surface of Flat window filter
The surface quality of Flat window filter is an important characteristic of glass. Our company's filter surface quality are selected from the U.S. military standard 40-20, international three-level specification to produce and process. Although the surface quality generally does not affect the optical characteristics of the filter product, it will affect the overall appearance of the product, which may become an important factor in the customer acceptance. Some types of glass simply produce surface corrosion or scratch. If the customer needs high quality glass substrate, the cost is generally higher; if the customer does not have high requirements for surface quality, he can choose some cheap optical glass to obtain lower cost.
