Description SPO polyolefin tubing has a 2:1 shrink ratio. When freely recovered, the tubing will shrink to 50% of its supplied diameter. SPO tubing meets MIL-I-23053/5, class 1, 2, and 3. It is UL Recognized and CSA certified to 600 volts @ 125°C. Class 3 material is also UL VW-1 and CSA OFT. SPO tubing is rated for continuous operation from -55°C to 135°C and can withstand elevated temperatures to 300°C
