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Cleanroom handling, not a sterile barrier: PP panels around medical devices
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A PP hollow panel keeps a device clean on its way through the plant. It does not keep it sterile in the theatre. That distinction decides the whole specification, and mixing the two is the most common mistake we see: a cleanroom transfer box is asked to do the job of a Tyvek pouch, and the audit finds it out. What the panel is actually good at is wipe-down, non-shedding surfaces, and a tray geometry that holds a stainless instrument still.
Cleanroom transfer boxes: 4 to 6 mm white or blue panel, every edge sealed, wiped with alcohol or IPA between zones without the surface chalking or the cut line opening up.
Instrument tray inserts: divider slots and machined pockets with a 2 mm radius on every cut, so a scissor or a clamp rests on plastic rather than on another instrument, and a gloved hand is not cut on the edge.
Pre-sterilisation staging: panels hold trays between washing and the steriliser, then stop. Steam at 121 °C softens the cell walls and the panel collapses, so nothing here goes inside the autoclave.
Single-use liners: a 2 mm panel folded into a shoulder box that sits inside an EO or gamma-sterilised outer bag, adding rigidity without adding fibre or adhesive.
Chemical compatibility is easy to state and easy to get wrong. PP takes alcohol, IPA, hydrogen peroxide and quaternary ammonium wipes indefinitely. It does not take ketones, esters or chlorinated solvents: acetone or a toluene-based label remover will cloud the surface and start a stress crack at a crease within days. Temperature is the other line. Continuous service above 70 °C softens the panel, and 80 °C is the practical ceiling, so a washer-disinfector set to 90 °C will distort a tray that was dimensionally perfect on arrival. |
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| Three things this material cannot do, and we say so before quoting. It cannot be sealed to form a sterile barrier: a folded panel with taped edges is not a validated pouch, and a Class III implant needs a Tyvek lid and a thermoformed base. It cannot be autoclaved. And it is not a particle-free material in the sense of a cleanroom garment: a cut edge will release a few flakes until it is sealed, which is why we seal every edge on an ISO 7 box and leave only the wipe-down faces exposed. |
 | Medical buyers at the 2025 Indonesia Industrial Exhibition did the test on our stand rather than reading a data sheet: an IPA wipe across a sealed edge, then a look at the cloth. That is why the sealed edge is now standard on every cleanroom panel we ship, and why the solvent list travels with the quotation instead of sitting in a manual. |  |
