The 9 symbol must be indicated on the lens and the frame to guarantee protection from thermal risks. Thermal risk - Protection from radiating heat, intense heat, sprays of hot liquids or solids.The 8 symbol must be indicated on the lens and the frame to guarantee protection from electrical risks. Electrical Risk - Protection from live contact and short circuit electrical arcs.If the symbols differ, the symbol representing the lowest resistance is applied to the protection as a whole. The F, B or A symbol must be indicated on the lens and the frame to guarantee protection. Mechanical risk - Projection of debris and metal filings from tools, particle projections and grinding work.Types of eyewear protection for various environments and risk types A letter N are fog-resistant or anti-misting. Glasses with K indicated on the lens offer resistance to surface damage from fine particles.Mechanical strength is indicated by a symbol of S, F, B, A or T, denoting how strong the glasses are.For example, a shade number between 1.2 and 6 can be used as protection when welding. Safety spectacles with a filtering effect are given specific codes.A letter 'C' indicates whether they impair colour perception.A manufacturer's mark (sometimes with a kite mark).Safety goggles feature lens and frame markings which are mandatory and essential to understand when selecting eye protection. Overspecs can be worn over prescription glasses with little interference for protection. Prescription safety glasses are designed with prescription lenses to enable you to wear them in place of your own spectacles with goggles over them.
You can find out more about safety glasses and protective eyewear in our comprehensive safety glasses guide. Some safety eyewear are manufactured from acetate and CR39 which provides general impact protection, but these are more suited to liquid and chemical splash safety protection. These lenses are commonly made from clear anti-scratch polycarbonate, which offers the highest impact level tested under EN166. Safety glasses are spectacles or goggles worn to protect your eyes and are an item of PPE (Personal Protective Equipment).
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