0.9mm thick aluminium with 0.1mm enclosed retroreflective lens sheeting on surface Excellent levels of resistance to chemicals, oils, salt and temperature High tensile strength PET top layer Ready made hazchem plate for petrol When ordering these ready-made Hazchem plates, please advise what SPECIALIST ADVICE you wish to display Materials Explained Below is a more detailed description of the materials this particular safety sign is available in. Helping you decide which sign option is most suitable for your application. Aluminium: 0.9mm aluminium with a gloss white powder coated face. Suitable for both internal and external applications. Excellent weathering and UV resistance provides a long-life product.