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Design Guide for PP Industrial Dunnage and Handling Trays in electronics and electrical: 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 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 ESD and conductive grades; gauge 1.5 to 8.0 mm; returnable and reusable designs. Materials most often specified are Polycarbonate, Acrylonitrile Butadiene Styrene, High Density Polyethylene, Polypropylene, 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, connector carriers, accessory blisters.

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
Acrylonitrile Butadiene Styrene1.04-1.06 g/cm³30-50 MPa-20°C to 80°C
Polypropylene0.90-0.91 g/cm³25-40 MPa-10°C to 100°C
High Density Polyethylene0.94-0.97 g/cm³20-32 MPa-50°C to 80°C

Polypropylene is frequently the default selection here: PP is the lightest mainstream packaging resin and keeps its shape under repeated flexing.

Design Rules for Thermoformed Parts

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

  • Add ribs, steps or kiss-offs instead of increasing overall gauge to gain stiffness.
  • Design uniform wall thickness by avoiding abrupt depth changes in the same cavity.
  • Keep the draw ratio moderate: deep cavities thin the sheet and force you to start with a thicker gauge.
  • Make corner radii at least equal to the sheet thickness; sharp corners are where holes start.
  • Confirm the trim method early: steel rule die, CNC router or press tool each have different tolerances.
  • Leave a flat sealing flange of at least 6 mm when the pack has to be heat sealed or lidded.

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

  • Polycarbonate based: outstanding impact strength (250x glass)
  • Acrylonitrile Butadiene Styrene based: high impact toughness
  • High Density Polyethylene based: high impact strength even at low temperature
  • 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.

  • Welding
  • Assembly
  • Twin sheet forming
  • Cnc trimming

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

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

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

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.

Can you produce industrial dunnage and handling trays in Polypropylene?

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 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.

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.

Conclusion

If you are planning a new electronics and electrical 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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