SL-SF03 Lens Flame Retardant Testing Machine The SL-SF03 Lens Flame Retardant Testing Machine is designed to evaluate whether spectacle lens materials possess the required flame retardant properties to ensure user safety compliance with international standards. Key Features High Temperature Capability: Adjustable temperature up to 800°C with a regular cylindrical steel bar (6mm x 300mm) heating element High Precision: Pneumatic device for automatic raise and lower of the