PSFR high-temperature heat-shrinkable marking tubes are made of flame-retardant irradiated cross-linked polyvinylidene fluoride (PVDF), specifically designed for wire number marking in high-temperature environments or harsh environments that require resistance to the erosion of fuel, lubricants, and cleaning agents. They are also ideal products for use in places with high requirements for low-vacuum volatilization. The product features ultra-thin wall thickness and is available in both continuous and conformable types, both of which can be directly printed. When in use, simply use a heat gun to shrink the marking tube onto the cable to obtain a permanent marking.