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Design Guide for PET Cosmetic and Personal Care Blister Packs 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 cosmetic and personal care blister packs 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 metallised and frosted finishes; single and multi product cavities; gauge 0.25 to 0.60 mm. Materials most often specified are Recycled PET, Polystyrene, Polylactic Acid, Polypropylene, 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 gift set inserts, sample cards, razor packs.

Key Material Properties

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

MaterialDensityTensile strengthService temperature
Polyethylene Terephthalate1.35-1.40 g/cm³50-70 MPa-40°C to 70°C
Polylactic Acid1.24 g/cm³50-60 MPaup to 55°C (HDT)
Polystyrene1.04-1.06 g/cm³30-50 MPa-20°C to 70°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

A few geometry decisions made on the drawing save weeks of tooling adjustment later.

  • Design uniform wall thickness by avoiding abrupt depth changes in the same cavity.
  • Add ribs, steps or kiss-offs instead of increasing overall gauge to gain stiffness.
  • Avoid undercuts unless the tool has moving sections, which adds cost to every cycle.
  • Keep the draw ratio moderate: deep cavities thin the sheet and force you to start with a thicker gauge.
  • Confirm the trim method early: steel rule die, CNC router or press tool each have different tolerances.
  • 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

  • Polyethylene Terephthalate based: excellent barrier to CO2 and moisture
  • Polystyrene based: rigid and glossy
  • Polylactic Acid based: bio-based and industrially compostable
  • 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

The route below is the one most factories use for this type of part.

  • Die cutting
  • Printing
  • Pressure forming
  • Vacuum 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 Cosmetic and personal care blister packs Correctly

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

  1. request a scratch resistant grade for clear windows
  2. check product compatibility with the resin
  3. use anti-static material for dark or glossy packs
  4. confirm the display format required by the retailer
  5. validate the seal to printed cards

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

Frequently Asked Questions

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.

What is the minimum order quantity for cosmetic and personal care blister packs?

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.

Which certifications can you provide?

We can provide ISO 9001 quality system documentation, material certificates, RoHS and REACH statements, and where applicable food contact, flame retardancy or drinking water approvals. Tell us your target market and we will match the document set.

Can you produce cosmetic and personal care blister packs in Polyethylene Terephthalate?

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.

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.

Conclusion

Our team supplies cosmetic and personal care blister packs to cosmetics and personal care customers worldwide, with samples, material certificates and full inspection reports available before mass production.

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