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Design Guide for PVC Pharmaceutical Blister Packaging in medical and pharmaceutical: Draft, Radii and Draw Ratio

2026-10-02 Plastic News 0 views

Thermoforming rewards designs that respect how a heated sheet stretches. These rules prevent most tooling rework and most thickness complaints.

Use it as a working checklist when you write your next enquiry.

Product Overview

This category covers a family of products rather than a single item. In practice a buyer defines pharmaceutical blister packaging by three things: the base resin, the format or dimension, and the performance or certification level it has to meet. Typical options in this category include cavity layouts 4 to 30 tablets; push through and peelable lidding; PVDF coated PVC for high barrier. Materials most often specified are Polypropylene, Polyethylene Terephthalate, Polyvinylidene Fluoride, Polyvinyl Chloride, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the medical and pharmaceutical sector the decision is usually driven by validated sealing and sterilisation compatibility, with traceability as a secondary requirement. Typical end uses include diagnostic packs, IV and catheter kits, pharmaceutical blisters.

Key Material Properties

The table below summarises the values that usually decide the material choice.

MaterialDensityTensile strengthService temperature
Polyethylene Terephthalate1.35-1.40 g/cm³50-70 MPa-40°C to 70°C
Polypropylene0.90-0.91 g/cm³25-40 MPa-10°C to 100°C
Polyvinyl Chloride1.38-1.45 g/cm³40-55 MPa-10°C to 60°C

Polyvinyl Chloride is frequently the default selection here: PVC can be formulated from rigid pipe compound to soft medical grade by changing plasticiser content.

Design Rules for Thermoformed Parts

Apply these points before the tool is cut; after that every change costs tooling and time.

  • Leave a flat sealing flange of at least 6 mm when the pack has to be heat sealed or lidded.
  • Avoid undercuts unless the tool has moving sections, which adds cost to every cycle.
  • Confirm the trim method early: steel rule die, CNC router or press tool each have different tolerances.
  • Make corner radii at least equal to the sheet thickness; sharp corners are where holes start.
  • Keep the draw ratio moderate: deep cavities thin the sheet and force you to start with a thicker gauge.
  • Use a draft angle of at least 3 degrees per side so the part releases without vacuum locks.

Send these rules to your designer together with the sheet gauge and the target cycle time; most tooling modifications come from ignoring draft and corner radii.

Common Grades and Variants

  • Polyvinylidene Fluoride based: excellent chemical and UV resistance
  • Polyethylene Terephthalate based: excellent barrier to CO2 and moisture
  • Polyvinyl Chloride based: inherently flame retardant
  • Polypropylene based: lowest density among commodity plastics

Beyond the base resin, most suppliers offer UV stabilised, food contact, flame retardant, anti-static and recycled content versions of the same product. Ask which additive package is included, because it is often the difference between a part that lasts three years and one that lasts ten.

Processing and Finishing Options

Each step below has its own control points, and skipping one of them is where most defects start.

  • Aluminium lidding
  • Film calendering
  • Thermoforming
  • Sealing and perforating

Secondary operations such as printing, welding, machining and assembly are often cheaper to do in the same factory, and they reduce the risk of mismatch between components.

How to Specify Pharmaceutical blister packaging Correctly

Use this checklist when comparing two or three supplier quotations.

  1. keep full material traceability per batch
  2. check child resistance certification where required
  3. validate seal integrity with a dye or vacuum test
  4. define the barrier requirement by product stability data
  5. confirm lidding type: push through or peelable

Send this list to your supplier with the drawing and you will receive comparable quotations from every factory you contact.

Frequently Asked Questions

Do you offer samples?

Yes. Standard samples are normally free of charge and shipped within three working days; custom samples are charged at cost and credited against the first production order.

What packing and shipping options are available?

Standard packing is export cartons on fumigation-free pallets, with custom labelling, barcode and retail packing available. We also handle consolidated containers and door to door delivery.

How long does tooling and sampling take?

A new tool typically takes 25 to 45 days depending on cavity count and complexity, followed by T1 samples within one week. Existing tools can usually start production within 10 to 15 days of order confirmation.

How do you control colour consistency?

Colour is controlled with a masterbatch reference approved by the customer, and every production lot is checked against the approved sample under standard lighting before shipment.

Can you produce pharmaceutical blister packaging in Polyvinyl Chloride?

Yes. {mat1} is one of our regular materials for this item, and we can supply virgin, modified and certified grades with full traceability. Material certificates and test reports are issued per batch.

Conclusion

Our team supplies pharmaceutical blister packaging to medical and pharmaceutical customers worldwide, with samples, material certificates and full inspection reports available before mass production.

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