"Emergency Eye Wash Station - Keep Area Clear" Bilingual Sign by SmartSign | 7" x 10" Plastic DURABLE PLASTIC. Signs use 55 mil thick HDPE (high density polyethylene) and can last up to 2 years outside. Signs have a 100% recyclable base material. INSTALLATION. Signs have pre-punched and pre-cleared mounting holes for easy installation. Signs mount to walls, fence posts and doors, and can be used indoors or outdoors. LAMINATED. To achieve maximum durability, sign graphics are digitally printed and protected with a laminate. This provides enhanced weather and chemical resistance. ROUNDED CORNERS. Signs have rounded corners and burr-free corners for safe handling, longer life and a professional appearance.