Device housings, sterile enclosures, fume-hood sashes and cleanroom viewing panels — where virgin material and traceability matter more than price, and a sealing face is judged by flatness, not by size.
Medical buyers ask two questions that sound similar and are not: "is the material virgin?" and "can you prove it?". The first is about grade, the second about documentation. Many suppliers answer the first and hope you forget the second.
We use virgin cast sheet for all medical and laboratory work — no regrind, no recycled content. Each batch carries a mill certificate from the sheet supplier identifying grade, lot and date. Where a project needs batch-level traceability on the finished part, we record the sheet lot against the work order so a part can be traced back to its sheet.
What we do not claim: we are not an ISO 13485 certified medical device manufacturer, and our parts are components rather than finished devices. If your regulatory pathway requires a certified contract manufacturer, we will tell you that we are not the right supplier for that tier rather than imply otherwise.
When a housing has to seal against a gasket, the critical property is not the overall dimension — it is flatness across the sealing face and consistency of the gasket groove depth. A housing that is 0.5 mm oversize but flat will seal. One that is dimensionally perfect but warped 0.2 mm will leak.
Machining introduces stress, and stress makes acrylic move after machining. The sequence that works is: machine, anneal, then finish the sealing face. Doing it in the other order means the face moves after it has been measured.
We check flatness on a granite surface plate with a dial indicator and record the reading. For a typical 300 mm gasket face we hold 0.1 mm flatness; tighter is possible but the cost rises steeply because the whole panel has to be stress-relieved and machined in a temperature-stable area.
Acrylic survives alcohol-based disinfectants reasonably well but not indefinitely, and it does not survive repeated exposure to strong solvents, ammonia or high-temperature autoclaving. If a component will be autoclaved at 121 °C, acrylic is the wrong material and polycarbonate, polysulfone or glass should be considered.
For wipe-down disinfection, which covers most laboratory and clinical equipment housings, standard cast acrylic is appropriate. The two variables that shorten its life are the aggressiveness of the agent and the quality of the edge finish — a rough machined edge gives the solvent a place to start, and crazing follows.
We ask for the cleaning protocol at quotation time and, where it is known, we run a small coupon test: immerse an offcut in the actual agent for the expected contact time, then inspect for clouding and crazing. It takes a day and it prevents a field failure.
Being clear about limits saves everyone a project:
In each of these cases we will say so at quotation stage, even though it costs us the order.
Questions on this line
Yes. A mill certificate from the sheet supplier is supplied per batch on request, identifying grade, lot and date. Where the project needs part-to-sheet traceability, we record the lot number against the work order and mark it on the packing list.
The material is suitable for wipe-down disinfection with alcohol-based agents. It is not suitable for autoclave sterilisation, gamma irradiation at high dose, or repeated exposure to strong solvents. Tell us the sterilisation method before we quote and we will confirm whether acrylic is appropriate.
0.1 mm flatness on a 300 mm face is achievable with machining followed by annealing and a final finishing pass, measured on a granite plate. Larger faces and tighter flatness are possible but cost rises steeply, because the panel has to be fully stress-relieved and machined in a temperature-stable area.
The sterilisation or disinfection method decides whether acrylic is the correct material at all. Send it with the drawing and we will confirm material suitability before quoting.
