This is how we measured the Spiral core ID with calliper

Normally :Sprial core( ID ),

               Length after shrink(L)

               Rubber Thickness(T) 

(EPDM) cold shrinkable sleeve is a kind of rubber insulating sleeve that is pre-expanded on the pumpable support tube, which only needs to be positioned and withdrawn from the support tube when used, and uses its radial pressure to form a coating to play the role of waterproof and moisture-proof sealing. It is made of EPDM rubber material, which has excellent weather resistance, acid and alkali resistance, and achieves the effect of sealing.

Features:

●Shrinkage ratio: 3-4

●Halogen-free, non-toxic, flame retardant

●Environmental standard: RoHS

●Weather-resistant, wear-resistant, high elastic

● color: Black