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Design Guide for PET Face Seal Blister Packaging in cosmetics and personal care: 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.

Everything here can be checked on a real sample before you commit to a production order.

Product Overview

This category covers a family of products rather than a single item. In practice a buyer defines face seal 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 sheet gauge 0.20 to 0.60 mm; cavity depth up to 60 mm; transparent, frosted and coloured. Materials most often specified are Polypropylene, Polyethylene Terephthalate, Recycled PET, Polyvinyl Chloride, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the cosmetics and personal care sector the decision is usually driven by product compatibility and optical clarity, with print quality as a secondary requirement. Typical end uses include travel size packs, mascara blisters, gift set inserts.

Key Material Properties

Typical values for a general purpose grade are listed below; filled, stabilised and speciality compounds will differ.

MaterialDensityTensile strengthService temperature
Polystyrene1.04-1.06 g/cm³30-50 MPa-20°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

Polyethylene Terephthalate is frequently the default selection here: High IV PET resin is the reason a 1.5 L bottle can be light yet hold carbonation pressure.

Design Rules for Thermoformed Parts

Thermoforming rewards designs that respect how the sheet stretches. These rules prevent most tooling rework.

  • Add ribs, steps or kiss-offs instead of increasing overall gauge to gain stiffness.
  • Leave a flat sealing flange of at least 6 mm when the pack has to be heat sealed or lidded.
  • Design uniform wall thickness by avoiding abrupt depth changes in the same cavity.
  • Avoid undercuts unless the tool has moving sections, which adds cost to every cycle.
  • Use a draft angle of at least 3 degrees per side so the part releases without vacuum locks.
  • Confirm the trim method early: steel rule die, CNC router or press tool each have different tolerances.

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

  • Polypropylene based: lowest density among commodity plastics
  • Polyvinyl Chloride based: inherently flame retardant
  • Polystyrene based: rigid and glossy
  • Polyethylene Terephthalate based: excellent barrier to CO2 and moisture

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

Processing method drives both cost and performance, so it should be fixed early in the design.

  • Die cutting
  • Sheet extrusion
  • Heat sealing
  • Pressure forming

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 Face seal blister packaging Correctly

Work through these points in order and most specification mistakes disappear.

  1. ask for a drop test on the finished pack
  2. verify recycled content documentation if rPET is used
  3. leave a flat flange for heat sealing
  4. confirm the sealing coating matches the card
  5. check the corner radius against the sheet gauge

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

Frequently Asked Questions

What tolerance can be achieved?

Standard production tolerance follows the relevant ISO or DIN tolerance class for the process; tighter tolerances are possible after machining or grinding, but they add cost. Define the tolerance only on the functional dimensions.

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.

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.

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.

What is the minimum order quantity for face seal blister packaging?

For standard sizes and colours the minimum is usually one pallet or one production run; for custom tooling the economic minimum depends on the tooling cost amortised over the expected volume. Send us your annual volume and we will calculate the break even point.

Conclusion

If you are planning a new cosmetics and personal care project, send us your drawing, annual volume and target properties, and we will come back with a material proposal, a tooling plan and a budget quotation.

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