How to Coat Your Safety Glasses with Anti-Reflective Material
Safety glasses offer protection from elements that might pose a threat to the user’s eyes. They are commonly used in the welding and pharmaceutical industry. Due to the reflective properties of glass and plastic—materials from which lenses are typically made—it has become a necessity to coat lenses with a non-reflective substance. These coats improve visibility, look and durability of the lens. Follow the simple steps described below in order to coat the safety glasses yourself with anti-reflective material.
Step 1 – Prepare the Oven
Adjust the oven to the required temperature. Normally the optimum temperature is 750 Fahrenheit or 400 Celsius. However set the temperature according to the instructions on the aerosol can. The optimum temperature is highly dependent on the chemical make-up of the anti-reflective coating and may differ among brands.
Step 2 – Prepare the Safety Glasses
Carefully slide out the lenses from the frame of the safety glasses. If you have trouble doing this, go to the nearest optician to get them removed. After you have done this, take a soft duster and readily clean each lens. Make sure that there is no dust otherwise this will ruin the anti-reflective coating that is to be applied in the next step.
Step 3 – Apply the Anti-Reflective Coat
Shake the can well before use and position it 16 inches or 40 centimeters away from the lens. Hold the lens from the edge with the help of a pair of tongs. Remember, your aim is a uniform thin coat and not a non-uniform thick one. Spray evenly on both sides of each lens and place them in the pre-heated oven. Make sure that you wear gloves during spraying as the chemicals can adhere to the skin. Also, special precautions should be taken to ensure that the spray is not inhaled. The use of a face mask is strongly recommended.
Step 4 – Time the Heating Process
It is crucial to heat the lens so that the anti-reflective material can strongly adhere to the lens. The optimum heating time is normally 1 hour, but it can vary depending on the brand of coating you are using. Use the timer to evaluate the heat treatment.
Step 5 – Finish Up
After the heat treatment, remove the lense from the oven. Use gloves and tongs to avoid burns. Cool the lenses slowly by placing in a location devoid of strong winds or dust. After the lenses have cooled down they are to be dusted and placed back into their frame. It is strongly suggested that you ask an optician to do this since uncalculated force on your part might damage the coating or scratch the lens.