When manufacturing parts for medical devices, selecting the wrong plastic can lead to more than just product failure - it can compromise patient safety, delay regulatory approval or disrupt sterilisation protocols. That's why choosing the right material for your injection moulded medical components is one of the most critical decisions in the development process.
At Plastic-IT, we work closely with OEMs, medical designers, and cleanroom manufacturers to match materials to the unique demands of each product - balancing strength, biocompatibility, sterilisation needs and regulatory requirements.
Why Material Selection Is Crucial in Medical Manufacturing
Medical plastics must function in environments that are far more demanding than standard industrial settings. They must be:
- Biocompatible for patient-facing use.
- Sterilisable using steam, ethylene oxide or gamma irradiation.
- Chemically resistant to alcohols, detergents and medications.
- Dimensionally stable in fluctuating temperatures and high moisture.
- Traceable and compliant with ISO 10993, USP Class VI or FDA guidelines.
Failure to meet these requirements can lead to product recalls, contamination or regulatory rejection.
Common Medical-Grade Plastics (and Where They're Used)
1. Polypropylene (PP)
Use: Syringe plungers, fluid delivery parts, test tube caps
- Excellent chemical resistance.
- Cost-effective for single-use items.
- Takes autoclaving well, which is where PP earns its place. Compatible with ETO. For gamma it needs a specifically gamma-stabilised grade, because unstabilised PP embrittles under irradiation.
2. Polycarbonate (PC)
Use: Diagnostic housings, surgical tool covers, filter holders
- High clarity and toughness.
- Good for parts requiring dimensional accuracy.
- Takes steam sterilisation, but limited cycles. PC yellows and crazes over repeated autoclaving, so check the cycle count the part has to survive.
3. ABS (Acrylonitrile Butadiene Styrene)
Use: Device enclosures, handheld components
- Strong, rigid and easy to mould.
- Can be coated or textured for aesthetics.
- Needs material grade validation for patient contact.
4. TPEs (Thermoplastic Elastomers)
Use: Gaskets, flexible tubing, soft-touch grips
- Rubber-like flexibility with injection moulding compatibility.
- Biocompatible options available.
- Good for dynamic movement or patient contact.
5. PEI (Polyetherimide, e.g. ULTEM™)
Use: Surgical trays, high-heat applications
- Exceptional thermal and mechanical stability.
- High-performance engineering plastic for reusable parts.
- Compatible with repeated sterilisation cycles.
Factors to Consider When Selecting Medical Plastics
| Factor | Questions to Ask |
|---|---|
| Biocompatibility | Will this plastic come into contact with skin, blood or internal systems? |
| Sterilisation | Does the part need to withstand autoclaving, ETO or radiation? |
| Mechanical Stress | Will the part bend, twist or hold structural loads? |
| Transparency | Is visibility through the part needed for diagnostics or fluid monitoring? |
| Regulatory Needs | Is it ISO 10993 or USP Class VI certified? Is the supplier traceable? |
We assist at every step to ensure your component doesn't just perform - but also complies.
How We Help You Choose the Right Material
Plastic-IT partners with you from initial design to final production:
1. Feasibility Review
We evaluate your component’s function and regulatory environment.
2. Material Matchmaking
We shortlist plastics based on sterilisation method, geometry and required properties.
3. Prototyping & Testing
Sample runs confirm fit, finish and performance before tooling begins.
4. Supply Chain Support
We source verified, medical-grade materials with full traceability.
5. Ongoing QA
For repeat orders, we maintain material consistency and can support audits.
FAQs
1. What plastic is best for medical housings?
Polycarbonate (PC) is often preferred for its toughness, clarity and ability to be sterilised. It's ideal for diagnostic or surgical device casings.
2. Can I sterilise injection moulded plastic parts?
Yes, but the plastic must be compatible with your sterilisation method (ETO, steam, gamma). We'll help match the plastic to your process.
3. Are all medical plastics biocompatible?
No. Only certain grades of PP, PC, TPE, etc., are certified for patient contact. Always request certification from your supplier.
4. Can I use TPEs in place of silicone?
In many cases, yes. TPEs offer flexible, rubber-like performance and can be moulded at high volumes with shorter cycle times.
5. How do I know which plastic meets FDA or ISO standards?
We work with verified suppliers and provide documentation for ISO 10993, USP Class VI or FDA-grade materials as needed.
Conclusion
The right plastic is more than just a material - it's the foundation of your device's safety, performance and compliance. At Plastic-IT, we help you navigate the complex world of medical-grade material selection, ensuring every component meets its purpose in the clinic, lab or hospital.
Request a Material Review OR Submit your CAD file for Advice on Plastic Selection