The Sterile Barrier, Not the Seal, Is the Product

Tyvek Pouch vs Tray Seal

Peel Force: The Window That Defines the Machine

ISO 11607 governs the sterile barrier. The seal must open with a consistent peel force (typically 1.0–4.0 N/15 mm for Tyvek/PE) leaving a clean fibre-tear, not a delamination. The machine variables:

• Jaw temperature: too low = weak seal; too high = Tyvek burnout and brittle peel.
• Dwell: longer dwell widens the acceptable temp band.
• Pressure: uneven pressure = channel leaks (the failure mode that breaches sterility).

A machine without jaw-temperature feedback and pressure mapping cannot hold this window across a shift — and you cannot validate what you cannot hold.

Field Data: A Turkish Catheter Line

An Istanbul maker of urinary catheters ran Tyvek/PE pouches at 28 pouches/min with peel-force spread of 0.8–6.1 N (out of spec both ways) and a 1.2% channel-leak rate on dye test. The jaw was setpoint-only.

We fitted jaw-temperature feedback, raised dwell 0.3 s, mapped pressure with shim gauges, and set a validated window (165°C, 0.35 MPa, 1.4 s). Outcome:

Channel leak = sterility breach. A channel leak is invisible to a pull test but fails the dye test. Validation must include dye or bubble testing, not just peel force.

Selection Errors

• Setpoint-only jaw. You cannot hold the peel window; validation will fail.
• No pressure mapping. Channel leaks slip through; sterility is compromised.
• Generic food sealer. A food pouch sealer is not built to ISO 11607 window; do not substitute.

Compliance by Region

European Union

MDR device rules, ISO 13485, ISO 11607 validation, and UDI on the pouch. CE under MDR; technical file with seal validation.

United States

FDA device rules, 21 CFR, QSR, and a validated sterile barrier per ISO 11607. UDI/GTIN required.

Southeast Asia

Halal where relevant; humid climate demands verified barrier integrity. Tyvek breathability aids EtO sterilization.

Middle East

GCC/SASO conformity, Arabic label, and tamper-evident pouch. Heat-stable seal window for summer plants.

Procurement Traps

• Buying a food sealer for a device — it will not validate to ISO 11607.
• No dye/bubble test rig in scope; you cannot prove barrier integrity.
• Omitting UDI coding from the pouch printer.

Frequently Asked Questions

Can a food pouch sealer pack a device?

No — it is not built to the ISO 11607 peel window and lacks pressure mapping. A medical sealer is a different machine.

What peel force is correct?

Typically 1.0–4.0 N/15 mm for Tyvek/PE, with a clean fibre-tear. Your validation master plan sets the exact band.

Why does my seal pass pull but fail dye?

A channel leak (uneven pressure) passes a pull test but breaches sterility. You need dye or bubble testing, not just peel.

Is Tyvek required?

For breathable sterile barrier (EtO/gamma), yes. Non-breathable film traps sterilant; Tyvek vents it.

Written by Helen Xu | Chief Industrial Application Engineer

Helen Xu is a Chief Industrial Application Engineer with 9 years of specialized experience in packaging machinery and liquid filling machine design, equipment model selection, and full production line process optimization. He focuses on delivering customized packaging & filling solutions for pharmaceutical, food, and chemical manufacturing industries, with mature practical expertise in GMP compliance, ISO 9001 quality management standards, and turnkey large-scale filling & packaging production line integration.