Medical Blister Packaging Material Comparison: PETG vs APET vs PP vs PS vs PVC

By Honest Packaging Engineering Team | Custom medical blister trays and sterile packaging since 2013

Last year, a client who makes aesthetic dermal fillers came to us in a panic. They had ordered 10,000 APET blister trays for their new product line, and after their first gamma sterilization run, every single tray had turned yellow and brittle. The whole batch was useless. They lost $12,000 on scrapped material, and their launch was delayed by 6 weeks. All because someone picked the cheapest material without checking if it was compatible with their sterilization method.

I’ve been designing and manufacturing medical blister packaging for 12 years, and this is one of the most common mistakes I see. Smart teams spend years developing their device, run clinical trials, get regulatory clearance, and then pick their packaging material based on which quote is the lowest. Then they find out the material doesn’t work with their sterilization method, doesn’t have the right biocompatibility documentation, or only has a 1-year shelf life when they need 5.

There is no “best” material for every medical blister tray. The right material depends on your device classification, sterilization method, required shelf life, and regulatory requirements. In this article, we’ll break down the 5 most common blister packaging materials, compare their real-world performance, and tell you exactly when to use each one — and when to stay away.

What to Look For in a Medical Blister Material

Before we get into the individual materials, there are 6 core criteria you need to evaluate for any medical blister packaging material. These are the factors that will make or break your packaging validation and regulatory submission:

Individual Material Breakdown

1. PETG (Polyethylene Terephthalate Glycol) — The Medical Grade Standard

PETG is the gold standard for medical blister packaging, and it’s what we recommend for 90% of the sterile medical devices we work with. Medical grade PETG has a slight light blue tint, excellent thermoforming characteristics, impact resistance, sterilization resistance, and heat seal performance. It meets all requirements for aging resistance and biocompatibility, and fully complies with medical primary packaging contact management requirements.

Approved medical grade grades: Eastman Eastar 6763 (medical grade), SK S2008 (medical grade). There is also SK K2012, which is food grade — we do not recommend this for sterile Class II/III devices.

Best for: Class III implantable and interventional medical devices, including catheters, guidewires, orthopedic implants, pacemakers, and surgical kits. If your device is implanted or enters the human body, PETG is almost always the right choice.

Shelf life: 5 years, validated with proper sterile barrier systems.

Sterilization compatibility: Compatible with ethylene oxide (EO), gamma irradiation, and low-temperature plasma sterilization. This is one of the biggest advantages of PETG — it works with almost every common sterilization method without discoloration or brittleness.

Downsides: PETG is more expensive than APET or PP, and the medical grade grades have longer lead times. But for Class II/III devices, the extra cost is almost always worth it to avoid validation failures and regulatory issues.

2. APET (Amorphous Polyethylene Terephthalate) — The Cost-Effective Option for Class II Devices

APET is a non-crystalline material with high clarity, good impact resistance, and lower cost than PETG. It’s pollution-free, has no crystal points, and is very transparent. The biggest downside of APET is its poor heat seal performance, and its limited sterilization compatibility.

For medical packaging, you should always use virgin food grade APET — never recycled material, which can have contaminants and inconsistent properties.

Best for: Class II medical devices, aesthetic and dermal filler devices, surgical and puncture products, and other devices that don’t require implant-grade biocompatibility. It’s a good choice if you’re cost-sensitive and only need EO sterilization.

Shelf life: Average 1-2 years.

Sterilization compatibility: Only suitable for ethylene oxide (EO) sterilization. Do not use APET for gamma irradiation — at high doses, APET will turn yellow and become brittle, exactly like the dermal filler client I mentioned at the start of this article.

Downsides: Poor heat seal performance requires more careful process validation. Only 1-2 year shelf life. Not suitable for gamma sterilization. Food grade material may not have the biocompatibility documentation required for higher risk devices.

3. PP (Polypropylene) — Limited Use for Low-Risk Devices

PP is a common plastic for general medical products, but it has significant limitations for blister packaging of sterile devices. It has lower clarity than PETG or APET, and poorer impact resistance at low temperatures.

Best for: Low-end medical consumables, non-sterile products, and devices that don’t require high clarity or long shelf life.

Shelf life: Average 1-2 years.

Sterilization compatibility: Do not use PP for gamma irradiation — it will discolor and become brittle. PP can be used for EO sterilization in some cases, but you need to validate dimensional stability carefully, as PP has higher shrinkage rates than PETG.

Downsides: Poor clarity, high shrinkage after sterilization, limited sterilization compatibility, only 1-2 year shelf life. We rarely recommend PP for sterile blister packaging unless there’s a very specific reason to use it.

4. PS (Polystyrene) — Not Recommended for Cleanroom Production

PS is a rigid, low-cost plastic that is sometimes used for very basic medical packaging. However, it has significant problems for cleanroom production. During thermoforming and processing, PS sheds particles easily, which can contaminate sterile products in an ISO 7 cleanroom environment.

Best for: Low-end medical consumable packaging, non-sterile products like surgical instrument trays, sample wells, and other non-critical applications. We do not recommend PS for any sterile device that comes into contact with the human body.

Shelf life: Average 1-2 years.

Sterilization compatibility: Can be used with e-beam sterilization for low-risk applications.

Downsides: Not suitable for cleanroom production due to particle shedding. Brittle, poor impact resistance. Only for low-end non-critical applications.

5. PVC (Polyvinyl Chloride) — Do Not Use for Medical Blister Packaging

We’re including PVC on this list only to tell you to stay away from it. PVC is banned for medical packaging use in Europe, and it is not suitable for cleanroom production. It has a strong odor, releases plasticizers, and has poor biocompatibility for sterile devices.

Best for: Nothing in sterile medical blister packaging. Don’t use it.

Shelf life: Average 1-2 years.

Sterilization compatibility: Not recommended for any common sterilization method.

Downsides: Banned in Europe, strong odor, releases plasticizers, poor biocompatibility, not suitable for cleanrooms. There is no good reason to use PVC for sterile medical blister packaging in 2026.

Full Comparison Table

How to Choose the Right Material for Your Device

Use this simple decision tree to pick the right material for your project:

3 Costly Mistakes to Avoid

1. Using food grade material for Class II/III sterile devices. Food grade PETG or APET may be cheaper, but it doesn’t come with the full biocompatibility documentation and traceability required for medical device regulatory submissions. If your auditor asks for ISO 10993 reports and you only have food grade certification, your entire submission can be rejected.

2. Picking material before you lock in your sterilization method. This is the #1 cause of material-related scrap and delays. Always lock in your sterilization method first, then pick a material that is compatible with it. If you think you might use gamma in the future, don’t pick APET — pay a little extra for PETG now and save yourself a $12,000 scrap batch later.

3. Only looking at per-unit price. APET might cost $0.05 less per tray than PETG, but if it only has a 2-year shelf life instead of 5, you’ll have to re-validate packaging twice as often. If it can’t be gamma sterilized, you limit your future market options. If it has higher scrap rates during thermoforming, your actual cost per good part ends up higher. Always calculate total cost of ownership, not just the price on the quote.

How We Can Help

We’ve been designing and manufacturing custom medical blister trays for 12 years, and we’ve helped over 80 medical device companies pick the right material for their devices. We only use medical grade materials with full COA and biocompatibility documentation, and all production is done in our ISO 7 (Class 10000) cleanroom under ISO 13485 quality management.

When you work with us, we don’t just sell you a tray — we help you through the entire process: material selection, design for manufacturing (DFM), prototype sampling, sterilization compatibility testing, and full validation documentation support for FDA and CE MDR submissions. We also manufacture matching Tyvek lids and mounting cards for interventional device kits, so you can get your entire sterile barrier system from one supplier.

If you’re not sure which material is right for your device, send us your device specifications and sterilization requirements. Our engineering team will provide a free material recommendation and design review within 2 business days, no obligation.

Frequently Asked Questions