Typical fiber optic heat shrink tubing has an inner diameter of 1.3mm, an outer diameter of 2.6mm, and a length of 60mm.

Standard Dimensions

Fiber optic heat shrink tubing is designed to protect and reinforce optical fiber splices. A common size includes:

• Inner Diameter (ID): 1.3mm
• Outer Diameter (OD): 2.6mm
• Length: 60mm
• Material: Cross-linked polyolefin with a stainless steel reinforcing rod
• Operating Temperature: -45°C to +100°C, with full recovery at 120°C These dimensions ensure the tubing fits over the splice while providing mechanical strength and environmental protection .

Shrink Ratio and Selection

Most fiber optic heat shrink tubing uses a 3:1 shrink ratio, meaning the tubing can shrink to one-third of its original diameter. This allows it to accommodate the splice and surrounding fiber while forming a tight seal . When selecting tubing, measure the widest point of the splice and choose tubing with a pre-shrink ID slightly larger than that measurement to ensure proper fit and secure shrinkage.

Features and Reinforcement

• Stainless Steel Rod: Provides mechanical support to prevent fiber breakage during installation and heat shrinkage .
• Clear Sleeve: Allows visual inspection of the splice before shrinking .
• Moisture and Heat Resistance: Cross-linked polyolefin and stainless steel construction protect against humidity, temperature fluctuations, and mechanical stress .
• Airproof Configuration: Ensures the splice maintains resistance to environmental conditions, preserving optical transmission .

Summary

For most single-fiber splices, 1.3mm ID, 2.6mm OD, and 60mm length tubing is standard. The tubing's reinforced design and shrink ratio make it suitable for secure, durable, and environmentally resistant fiber optic connections. Always verify the tubing size against the splice dimensions to ensure proper fit and protection .