T & F Insulations [P] Ltd supplies Poly Tetra Flouro Ethylene made Sleeves Tubing. T & F Insulations [P] Ltd is an ISO 9001 certified company. The Poly Tetra Flouro Ethylene made Sleeves Tubing is used for applications involving high temperatures, high frequencies or both. The Sleeves Tubing possesses good electrical properties and remains practically constant over a wide range of frequencies.