Phillips BoroView 3 & 5 lenses are designed to meet the need for the extra UV and IR protection needed when working on borosilicate glass. These lenses offer a revolutionary formulation designed to exactly meet the needs of those working with the harder, higher temperature of borosilicate glass. Phillips BoroView are specially formulated Polycarbonate filter lenses that Phillips Safety Products designed for the lampworking and glassblowing markets. This revolutionary product is greatly lighter than conventional laminated and glass products, and comes in a full coverage lens which is a higher quality design because there are no areas without shading. If you are working with smaller pieces, the BoroView 3 is for you. For larger pieces like candlesticks and statues, you will need the BoroView 5. BoroView’s should be worn when working on hard glass types where regular Phillips202/ACE or Polycarbonate Sodium Flare (SFP) Lenses are not adequate due to the fact of insufficient filtration of ultra violet and infra-red absorption.