Frequently Asked Questions
What is PET Heat Shrink Tubing and what is it made of?
PET Heat Shrink Tubing is a type of protective sleeving made from Polyethylene Terephthalate (PET). It features a specific molecular structure that allows it to shrink when exposed to heat, providing a tight, secure fit around cables, wires, and components. It has a specific gravity of 1.3–1.4 kg/L and a melting point exceeding 220℃.
What temperature range can PET Heat Shrink Tubing withstand during long-term use?
PET Heat Shrink Tubing is rated for long-term use in temperatures ranging from -40℃ to +125℃. Its melting point exceeds 220℃, making it suitable for applications that require reliable performance across a wide range of environmental and operating temperatures.
What are the electrical insulation properties of this PET tubing?
This PET Heat Shrink Tubing offers excellent electrical insulation performance. It provides a Dielectric Strength at Breakdown of greater than 80 KV/mm, a Surface Current Resistance of more than 10⁹ Ω, and a Volume Current Resistance exceeding 10¹⁴ Ω·cm — making it highly suitable for electrical insulation and protection applications.
What nominal sizes are available for PET Heat Shrink Tubing?
PET Heat Shrink Tubing is available in a wide range of nominal sizes, from 3Φ up to 124Φ mm. Each size comes with specific lay flat dimensions, wall thickness (W.T.), transverse shrinkage ratio, longitudinal shrinkage ratio, and high-temperature longitudinal shrinkage ratio to meet a variety of application requirements.
What is the typical transverse shrinkage ratio for PET Heat Shrink Tubing?
For smaller sizes (3Φ to 32.5Φ), the transverse shrinkage ratio is typically 47±4% or 48±4%. For larger sizes (40Φ and above), the transverse shrinkage ratio is 47±7%. The longitudinal shrinkage ratio remains consistent at 8±3% across all sizes, with the high-temperature longitudinal shrinkage ratio at 12±3% under (180±2)℃ for 15 minutes.
What are the mechanical strength properties of PET Heat Shrink Tubing?
PET Heat Shrink Tubing demonstrates strong mechanical performance. It has a Tensile Strength at Break of 5.0×10⁷ to 10.0×10⁷ N/m², an Elongation at Break of 200–350%, and a Tear Strength of 100–300 N/mm. Additionally, it has a water absorption rate of less than 2.0%, ensuring durability in various environmental conditions.
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