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Electronic Plastic Housings and Enclosures Specifications Explained: Sizes, Grades and Tolerances

2026-09-26 Plastic News 3 views

Specification sheets for electronic plastic housings and enclosures are full of abbreviations. This guide translates the dimensions, grades and tolerance classes into decisions you can actually make.

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 electronic plastic housings and enclosures 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 bosses and snap fits; EMI and anti-static grades; transparent windows and light pipes. Materials most often specified are Polycarbonate, Acrylonitrile Butadiene Styrene, PC/ABS Alloy, Polystyrene, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the industrial packaging sector the decision is usually driven by drop protection and cost per pack, with recyclability as a secondary requirement. Typical end uses include stretch film, protective foam, strapping.

Key Material Properties

The table below summarises the values that usually decide the material choice.

MaterialDensityTensile strengthService temperature
PC/ABS Alloy1.13-1.15 g/cm³45-60 MPa-30°C to 110°C
Polypropylene0.90-0.91 g/cm³25-40 MPa-10°C to 100°C
Acrylonitrile Butadiene Styrene1.04-1.06 g/cm³30-50 MPa-20°C to 80°C

Acrylonitrile Butadiene Styrene is frequently the default selection here: ABS is the default choice when a part needs a glossy, paintable, impact-resistant surface.

Dimensions, Grades and Tolerances

The table below summarises the values that usually decide the material choice.

  • wall thickness 1.2 to 3.0 mm
  • transparent windows and light pipes
  • textured and soft touch finishes
  • bosses and snap fits
  • EMI and anti-static grades

When you read a supplier quotation, check that the dimension, the resin grade, the colour reference and the tolerance class are all stated. A quotation that only gives a price per piece is not comparable between suppliers.

Common Grades and Variants

  • Acrylonitrile Butadiene Styrene based: high impact toughness
  • PC/ABS Alloy based: balances PC toughness with ABS processability
  • Polypropylene based: lowest density among commodity plastics
  • Polystyrene based: rigid and glossy

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.

  • Laser marking
  • Emi shielding coating
  • Painting
  • Ultrasonic welding

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 Electronic plastic housings and enclosures Correctly

Use this checklist when comparing two or three supplier quotations.

  1. check ESD behaviour if the board is exposed
  2. design ribs at 40-60% of wall thickness
  3. confirm the flame rating and glow wire requirement
  4. plan for heat dissipation early
  5. validate the IP rating with a real gasket

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.

What is the minimum order quantity for electronic plastic housings and enclosures?

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 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.

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 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.

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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