Raychem busbar high voltage heat shrink sleeving and tubing equivalent is made from radiation crosslinked halogen free compounds. Specially designed formulation makes the tubing to have excellent electrical, shrinking and anti-tracking properties. The tubing is suitable for application in insulating voltage busbar up to 15KV. The tubing shall be homogeneous and essentially free from flaws, defects, pinholes, bubbles, seams, cracks and inclusions.