Common Defects in PET Industrial Dunnage and Handling Trays for electronics and electrical and How to Prevent Them

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 industrial dunnage and handling trays 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 stack and nest geometry; gauge 1.5 to 8.0 mm; custom cavity layouts. Materials most often specified are Acrylonitrile Butadiene Styrene, Polyethylene Terephthalate, Polypropylene, Polycarbonate, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the electronics and electrical sector the decision is usually driven by ESD protection and dimensional accuracy, with cleanliness as a secondary requirement. Typical end uses include device inserts, battery packs, component trays.

Key Material Properties

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

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.

Failure Modes and Prevention

Each defect below has a root cause that can be removed at the design or tooling stage.

• warpage after washing – usually caused by gate position; prevent it by controlling tool design.
• static damage to parts – usually caused by melt temperature; prevent it by controlling tool design.
• loss of stack stiffness – usually caused by packing pressure; prevent it by controlling incoming inspection.
• wear of locating features – usually caused by melt temperature; prevent it by controlling incoming inspection.
• cracking at low temperature – usually caused by gate position; prevent it by controlling resin drying.

Common Grades and Variants

• High Density Polyethylene based: high impact strength even at low temperature
• Polypropylene based: lowest density among commodity plastics
• Polyethylene Terephthalate based: excellent barrier to CO2 and moisture
• Acrylonitrile Butadiene Styrene based: high impact toughness

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.

• Welding
• Assembly
• Cnc trimming
• Twin sheet 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 Industrial dunnage and handling trays Correctly

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

1. specify ESD grade if electronics are handled
2. check stack load and conveyor compatibility
3. define the number of returnable trips expected
4. design locating features that survive repeated use
5. validate washing and drying resistance

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.

Can you produce industrial dunnage and handling trays 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.

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.

What is the minimum order quantity for industrial dunnage and handling trays?

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.

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 industrial dunnage and handling trays to electronics and electrical customers worldwide, with samples, material certificates and full inspection reports available before mass production.