Heat Sealing Lids: The Critical Seal of the Sterile Barrier System

Lids are the key sealing materials that complete the sterile barrier system together with rigid blister trays; they must allow sterilants (EO gas or steam) to penetrate during sterilization while effectively blocking external microorganisms before use. Martin offers a multi-series range of coated lids based on DuPont™ Tyvek® and medical dialysis paper.

Overview

Lids are bonded to tray bodies through heat sealing and form the sealing core of the rigid blister tray sterile barrier system. Martin provides multiple series of coated lids built on DuPont™ Tyvek® and medical dialysis paper to safeguard the integrity of the sterile barrier.

Material Options & Applications

• Tyvek® Series (2FS / 1059B / 1073B): DuPont Tyvek delivers about 8 times the strength of medical packaging paper of the same basis weight, with excellent puncture resistance and low linting; it suits sharp surgical instruments, heavy orthopedic devices, and fragile high-value products. Hot-melt and water-based adhesive coating options are available, compatible with tray materials such as PETG, PVC, PS, and PP.
• Medical Dialysis Paper Series: Domestically produced and imported (e.g., French) dialysis paper with good breathability and cost efficiency, suitable for routine Class II devices and EO sterilization scenarios with high breathability requirements; 60g/70g coated water paper and high-temperature steam paper are also available.

Sterilization compatibility: Fully compatible with EO and Gamma sterilization. Tyvek lids provide excellent porosity (35–80 seconds), enabling rapid sterilant penetration and residue desorption.

Martin's Advantages

• Genuine materials & coating expertise: Built on the original US DuPont Tyvek substrate with Martin's in-house coating technology, ensuring uniform adhesive layers, consistent seal strength, and residue-free peeling.
• Customized printing & die‑cutting: High‑precision die‑cutting to match customer tray shapes and sizes; up to 4‑color printing plus sterilization indicators (e.g., ink that changes color) to improve clinical usability.
• Joint validation support: Lids can be validated together with Martin's own blister trays, helping customers quickly complete seal strength, dye penetration, and aging tests of the packaging system and shorten registration timelines.

Who We Serve

Medical device manufacturers using rigid blister trays for sterile packaging, especially in orthopedics, cardiovascular intervention, surgical instruments, and IVD reagents.