PET — what to write when qualifying a second source
- Expanded ID and recovered ID (e.g. 1.3 → 1.2 mm; mixed notation like OD 1.5 → recovered ID 1.0 mm is fine)
- Expanded wall — state it if you need the 0.0127 mm class; a thicker wall changes OD
- Length (800 · 1,300 mm etc.) and quantity (samples from 100 pcs)
- Medical grade and documents needed — MSDS · biocompatibility · sterilisation compatibility
FEP — it sets the OD in reflow
Slide a jacket (Pebax · TPU) over the braid, cover with FEP heat shrink and heat: the jacket melts into the braid and the FEP defines the OD. The final OD of a braided tube is therefore set by the FEP recovered ID. For a fixed-OD spec like 4.9 Fr, the FEP size must be reviewed together.
Other heat shrink materials
PTFE (2:1 · 4:1, high temperature), PFA (clear, heat resistant), PVDF (thin and stiff), PE (general 2:1), Pebax (same material as the jacket) and PEEK (high temperature, high stiffness) are also supplied. Recovery temperature and ratio per material are on each product page and TDS.