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Common Defects in PS / HIPS Face Seal Blister Packaging for hardware and tools and How to Prevent Them

2026-10-02 Plastic News 3 views

Most quality claims on thermoformed parts trace back to a handful of root causes. Learn to recognise them on the drawing, in the tool and on the finished part.

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 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 cavity depth up to 60 mm; sheet gauge 0.20 to 0.60 mm; transparent, frosted and coloured. Materials most often specified are Polyvinyl Chloride, Polyethylene Terephthalate, Recycled PET, Polypropylene, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the hardware and tools sector the decision is usually driven by puncture resistance and hanging strength, with visibility as a secondary requirement. Typical end uses include fixing packs, drill bit cards, hand tool clamshells.

Key Material Properties

These figures are typical for commercial grades and should be confirmed against the supplier's certificate for your specific lot.

MaterialDensityTensile strengthService temperature
Polystyrene1.04-1.06 g/cm³30-50 MPa-20°C to 70°C
Polyvinyl Chloride1.38-1.45 g/cm³40-55 MPa-10°C to 60°C
Polypropylene0.90-0.91 g/cm³25-40 MPa-10°C to 100°C

Polystyrene is frequently the default selection here: HIPS is the default thermoforming sheet for food packaging and appliance liners.

Failure Modes and Prevention

Spotting these early saves rework, freight and reputation.

  • static dust pickup – usually caused by gate position; prevent it by controlling tool design.
  • poor seal to the card – usually caused by packing pressure; prevent it by controlling handling and storage.
  • webbing between cavities – usually caused by gate position; prevent it by controlling handling and storage.
  • corner thinning – usually caused by gate position; prevent it by controlling handling and storage.
  • curling after sealing – usually caused by material moisture; prevent it by controlling resin drying.

Common Grades and Variants

  • Recycled PET based: lower carbon footprint than virgin resin
  • Polypropylene based: lowest density among commodity plastics
  • Polystyrene based: rigid and glossy
  • Polyvinyl Chloride based: inherently flame retardant

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.

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

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

These are the criteria that actually predict whether the part will perform in service.

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

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.

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.

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.

Can you produce face seal blister packaging in Polystyrene?

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

Share your specification and quantity with us and we will recommend the most cost effective material, tooling route and packing method for your market.

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