Union Soltek Group is an electronic material specialistic manufacture. Our research and develop group has developed white photoimageable solder mask (FOTOCHEM FSR-8000 LED-393W/387W/396W) which can be used to apply to LED related products. LED INKs have excellent coverage, low heat discoloration, high refectance rate (>90%), high resolution (3mil), excellent exposure condition (9-10 steps), excellent hardiness and it can compare to the solder mask of Japanese brand. More