What Plastic Is Used for Blister Packaging? A Complete Material Guide

The most common plastic used for blister packaging is PVC (polyvinyl chloride), accounting for over 60% of global blister pack production. However, depending on the application — pharmaceuticals, food, electronics, or consumer goods — manufacturers also widely use PET, PP, PVDC, ACLAR, and COC. Each material offers distinct barrier properties, clarity, formability, and cost characteristics that make it suitable for specific packaging needs.

This guide breaks down every major plastic used in blister packaging, compares their properties side by side, and helps you understand which material is right for which application.

What Is Blister Packaging and Why Does Material Choice Matter?

Blister packaging is a pre-formed plastic cavity sealed with a backing material (foil, paper, or plastic film) used to encase individual products. Found in pharmaceutical tablets, chewing gum, batteries, hardware, and toy accessories, it protects contents from moisture, oxygen, dust, and physical damage.

The choice of plastic directly impacts:

• Moisture vapor transmission rate (MVTR) — critical for hygroscopic drugs
• Oxygen transmission rate (OTR) — affects shelf life of oxidation-sensitive products
• Thermoformability — determines how sharply and accurately cavities can be formed
• Chemical compatibility — prevents migration of plasticizers into the product
• Regulatory compliance — particularly under ICH Q1B and FDA 21 CFR standards
• Sustainability profile — recyclability and carbon footprint

The 6 Main Plastics Used in Blister Packaging

1. PVC (Polyvinyl Chloride) — The Industry Standard

PVC remains the dominant blister packaging plastic due to its low cost, excellent thermoformability, and good clarity. It is particularly widespread in pharmaceutical tablet and capsule packaging worldwide. Standard PVC film for blister packaging typically ranges from 200 to 300 microns in thickness.

Key properties of PVC for blister packaging:

• MVTR: approximately 3.0–4.0 g/m²/day (moderate)
• OTR: approximately 20–30 cm³/m²/day (moderate)
• Thermoforming temperature: 80–120°C
• Relative cost index: 1.0 (baseline)

Limitations: PVC has a relatively poor moisture and oxygen barrier compared to specialty films, which can be a drawback for highly moisture-sensitive pharmaceutical products. Additionally, growing environmental regulations in Europe and parts of Asia are restricting PVC use due to concerns about chlorine and plasticizer content.

2. PVDC (Polyvinylidene Chloride) — The High-Barrier Coating

PVDC is rarely used alone — it is most commonly applied as a coating on PVC (written as PVC/PVDC) to dramatically improve barrier performance against moisture and oxygen. A PVC/PVDC laminate with 40–90 g/m² PVDC coating can reduce MVTR by up to 10 times compared to plain PVC.

• MVTR (PVC/PVDC 60 g): approximately 0.3–0.5 g/m²/day
• Used for moisture-sensitive APIs (active pharmaceutical ingredients)
• Cost index versus plain PVC: approximately 1.8–2.5×

This combination is particularly prevalent in tropical climates (ICH Zone III/IV) where humidity conditions are demanding.

3. PET (Polyethylene Terephthalate) — The Sustainable Alternative

PET is increasingly adopted as an eco-friendly alternative to PVC for blister packaging because it is widely recyclable (resin code #1) and offers superior clarity and stiffness. It is commonly used in food blister packs, electronics packaging, and consumer goods.

• Excellent optical clarity — transmittance above 85%
• MVTR: approximately 15–20 g/m²/day (lower barrier than PVC)
• Higher stiffness (tensile modulus ~2,800 MPa vs. PVC at ~2,100 MPa)
• Recyclable via mainstream plastic streams in most countries

Limitation for pharma: PET alone has a weaker moisture barrier than PVC, limiting its pharmaceutical use to non-hygroscopic products. However, PETG (glycol-modified PET) offers improved thermoformability and is gaining traction.

4. PP (Polypropylene) — Heat-Resistant and Chemical-Resistant

PP is the preferred blister packaging plastic for products requiring steam sterilization or exposure to elevated temperatures, making it indispensable for medical device packaging. It withstands temperatures up to 130°C without deformation.

• Heat resistance: up to 130°C (autoclave compatible)
• Chemical resistance: excellent against acids, solvents, and bases
• MVTR: approximately 6–10 g/m²/day
• Recyclable (resin code #5)
• Relatively lower clarity than PVC or PET

PP is also gaining favor in food packaging for its compliance with FDA food-contact regulations and its compatibility with microwave heating.

5. ACLAR (Polychlorotrifluoroethylene — PCTFE) — The Ultra-High Barrier Film

ACLAR provides the best moisture barrier performance of any thermoformable blister film, with MVTR values as low as 0.02–0.08 g/m²/day, making it the gold standard for highly moisture-sensitive pharmaceutical products.

• MVTR: 0.02–0.08 g/m²/day (up to 100× lower than plain PVC)
• Excellent chemical inertness — no plasticizers or additives
• Compliant with USP Class VI and FDA regulations
• Cost index versus plain PVC: approximately 5–10×
• Not recyclable in conventional streams

ACLAR is typically laminated with PVC (ACLAR/PVC) to combine thermoformability with ultra-low moisture transmission. It is widely used for biologics, lyophilized drugs, and effervescent tablets.

6. COC/COP (Cyclic Olefin Copolymer / Polymer) — The Emerging Premium Option

COC and COP are cutting-edge materials offering ultra-clear, halogen-free, and very low extractable profiles, positioning them as next-generation solutions for sensitive pharmaceutical and diagnostic packaging.

• MVTR: approximately 0.1–0.3 g/m²/day
• Optical transmittance: >92% (superior to all alternatives)
• Contains no chlorine, halogens, or plasticizers
• Compatible with e-beam and gamma sterilization
• Cost index: 8–15× PVC baseline

Full Comparison: Blister Packaging Plastics Side by Side

The table below compares all six materials across the most critical selection criteria. Numbers reflect industry-standard film grades at approximately 250 microns equivalent thickness.

Table 1: Comparison of major blister packaging plastics across key technical and commercial performance criteria. MVTR and OTR measured at 38°C/90% RH and 23°C/0% RH respectively. Cost indices are approximate market averages and may vary by region and supplier.

Which Plastic Is Used for Pharmaceutical Blister Packaging?

The pharmaceutical industry uses a tiered material selection system based on the moisture sensitivity classification of the active pharmaceutical ingredient (API). This framework, aligned with ICH Q1 stability guidelines, determines which blister film to specify at each protection level.

Table 2: Pharmaceutical blister film selection by API moisture sensitivity classification, aligned with ICH Q1 stability testing guidelines.

Blister Packaging Plastics by Industry Application

Different industries prioritize different material attributes, leading to distinct plastic preferences across sectors.

Food Packaging

PET and PP dominate food blister packaging because they are food-contact compliant, recyclable, and offer adequate protection at low cost. Chewing gum, confectionery, and snack items are typically packaged in PET blisters sealed to aluminum or paper-backed lidding. PP is preferred when the pack needs to withstand heat during transportation in warm climates.

Electronics and Hardware

PET and PETG are the dominant choices for clamshell and face-seal blister packs for batteries, USB drives, and small electronics, primarily due to their superior clarity and structural rigidity. PET offers a tensile strength of approximately 80 MPa, helping protect products against retail-handling damage. Some anti-static blister materials incorporate carbon black or conductive coatings into PET substrates.

Medical Devices

PP and Tyvek-sealed thermoformed trays made from PP or PETG are industry standard for sterile medical device packaging because PP's autoclave resistance (121–134°C) allows steam sterilization directly in the final package. ISO 11607-1 governs sterile barrier system requirements, and both PP and PETG meet its standards for thermoformed cavity components.

Environmental and Regulatory Trends Affecting Blister Packaging Plastics

Increasing environmental regulations are reshaping which blister packaging plastics manufacturers are allowed and incentivized to use. Key trends include:

• EU PVC restrictions: The European Chemicals Agency (ECHA) is progressively restricting phthalate plasticizers in PVC under REACH regulation, pushing pharmaceutical companies toward PVC alternatives such as PET or PP.
• EU Packaging and Packaging Waste Regulation (PPWR): Proposed 2024 rules require an increasing percentage of packaging to be recyclable by 2030, favoring PET and PP over PVC and PVDC.
• Halogen-free mandates: Several major retailers and healthcare providers in the EU and Japan now require halogen-free packaging, driving adoption of COC, PP, and PET at the expense of PVC, PVDC, and ACLAR.
• Mono-material blister packs: Research into recyclable mono-material blister systems (e.g., all-PP or all-PET constructions including the lidding) is accelerating, with pilot commercial launches recorded between 2023 and 2025.

How to Choose the Right Blister Packaging Plastic: A Decision Framework

The optimal blister packaging plastic selection comes down to five factors evaluated in sequence.

Table 3: Five-step decision framework for selecting the optimal plastic material for blister packaging applications.

Frequently Asked Questions (FAQ)

Is PVC safe for pharmaceutical blister packaging?

Yes — pharmaceutical-grade PVC used in blister packaging must comply with USP, Ph. Eur., and FDA regulations, which set strict limits on plasticizer migration (particularly DEHP/DINP levels). However, growing regulatory pressure in the EU means PVC use is increasingly evaluated on a case-by-case basis, and many manufacturers are proactively transitioning to PVC-free options.

What is the difference between PVC and PVDC blister packaging?

PVC is the base film with moderate moisture protection. PVDC is a coating applied on top of PVC to create a high-barrier laminate (PVC/PVDC). The PVDC coating reduces moisture vapor transmission by 6–10× compared to plain PVC, making the combination suitable for moisture-sensitive pharmaceuticals, especially in tropical climates.

Can blister packaging plastic be recycled?

It depends on the material. PET (#1) and PP (#5) are recyclable in most municipal programs. PVC is technically recyclable but not accepted in most curbside collections. PVDC-coated PVC, ACLAR, and COC are generally not recyclable through standard channels. The blister packaging industry is actively developing recyclable mono-material designs to address this gap.

What plastic is used for child-resistant blister packaging?

Child-resistant blister packs typically use thicker gauge PVC (300–400 µm) or PVC/PVDC constructions with specially designed push-through resistance. Some systems use a two-layer approach combining a peelable PET lidding over the main foil, requiring a two-step action to access the product and thus meeting CR requirements under ISO 8317 or CFR 16 Part 1700.

What is the thickest gauge of PVC used in blister packaging?

Standard pharmaceutical PVC blister film runs from 200 to 300 microns. Thicker gauges up to 500 microns are used in heavy-duty consumer product blisters (e.g., power tools accessories, automotive parts). Thicker film offers greater structural rigidity and puncture resistance but requires higher forming temperatures and pressures.

What is ACLAR and why is it used instead of PVC?

ACLAR is a film based on PCTFE (polychlorotrifluoroethylene) chemistry. It is used instead of PVC when a product's moisture sensitivity demands MVTR below 0.1 g/m²/day — a threshold PVC and PVC/PVDC cannot reliably achieve. Despite costing 5–10× more than PVC, ACLAR enables extended shelf life (often 24–36 months versus 12–18 months with PVC) for high-value biologics and specialty pharmaceuticals.

What is the future of blister packaging plastic materials?

The industry is trending toward three directions: (1) recyclable mono-material PET or PP blister systems to meet EU PPWR mandates; (2) halogen-free high-barrier films using COC or PCTFE alternatives without chlorine content; and (3) bio-based PET derived from plant feedstocks, which maintains recycling compatibility while reducing fossil-fuel dependency. Several pharmaceutical companies have publicly committed to PVC phase-out targets between 2027 and 2032.

Conclusion

PVC remains the most widely used plastic for blister packaging globally, but no single material is optimal for every application. The decision should always be driven by a systematic evaluation of barrier requirements, regulatory compliance, sterilization needs, sustainability targets, and total cost of ownership.

For standard pharmaceutical tablet packs, PVC delivers the best cost-performance balance. For high-barrier pharmaceutical applications, PVC/PVDC or ACLAR are the proven choices. For food and electronics, PET offers recyclability and clarity. For medical devices requiring sterilization, PP is irreplaceable. And for the most demanding sensitive APIs or diagnostic applications, COC and COP represent the premium frontier.

As environmental regulation tightens and sustainability commitments deepen across healthcare and consumer goods industries, expect a gradual but significant shift toward recyclable, halogen-free blister materials over the coming decade.