“PTNA＆PTUA” is a heat-shrink tube for fluorescent lamps with long life time. “PTNA” is ideal for fragment retention fluorescent lamps. “PTUA” is ideal for fluorescent lamps with effective UV and fragment retention. “PTU403A” absorbs more than 99% of UV-A radiation and filters up to 400nm. And “PTU507A” absorbs more than 99% of UV-A radiation and filters up to 500nm.