Introduction
Selecting the right blister packaging material is a critical decision in pharmaceutical product development. Packaging must protect medicines from environmental factors, maintain product integrity and support the intended shelf life.
PVC Blister Packaging
Polyvinyl chloride (PVC) is widely used as a thermoforming material for pharmaceutical blister packaging. Its transparency, formability and relatively low cost make it suitable for products that do not require exceptionally high moisture protection.
Key advantages
- Good transparency for product visibility
- Good thermoforming characteristics
- Economical for high-volume packaging
- Compatible with commonly used blister equipment
PVDC-Coated PVC
Polyvinylidene chloride (PVDC) is commonly applied as a coating to PVC films to improve barrier performance. PVDC-coated PVC generally provides greater moisture and oxygen resistance than uncoated PVC, depending on the coating and film construction.
Triplex Blister Packaging
Triplex commonly refers to a multilayer structure, often involving PVC, PE and PVDC. The exact construction should always be confirmed from the supplier specification because the term does not represent one universal barrier specification.
PVC vs PVDC vs Triplex: Technical Comparison
| Parameter | PVC | PVDC-Coated PVC | Triplex |
|---|---|---|---|
| Structure | PVC film | PVC with PVDC coating | Multilayer construction |
| Moisture barrier | Relatively lower | Higher than PVC | Depends on construction |
| Transparency | Good | Generally good | Depends on structure |
| Thermoformability | Good | Good | Depends on structure |
| Cost | Generally lower | Higher than PVC | Specification dependent |
How to Select the Right Blister Material
- Evaluate formulation moisture and oxygen sensitivity
- Define required shelf life and storage conditions
- Compare relevant barrier test data
- Assess forming depth and machinery compatibility
- Conduct packaging integrity and stability studies
- Evaluate material cost and supply availability
Frequently Asked Questions
Which blister material provides better moisture protection?
PVDC-coated structures and suitably specified multilayer structures can provide higher moisture protection than standard PVC. Actual performance should be confirmed using material-specific test data.
Is PVC suitable for pharmaceutical packaging?
Yes. PVC is widely used when its protective characteristics meet the product's stability and packaging requirements.