Electronic Enclosure Materials Selection Guide: ABS, PC, PC+ABS, ASA, and PP

The material for an electronic housing affects much more than price. It changes how the enclosure handles impact, heat, sunlight, chemicals, assembly, and daily use.

So where should you start? Look at the product first. The right electronic enclosure materials depend on where the device will be used, how it will be handled, and what the housing must protect.

What Should You Check Before Selecting an Enclosure Material?

Before comparing ABS with PC or ASA, picture the product in service. Will it sit on a desk, travel in a toolbox, hang outdoors, or be cleaned with chemicals?

These questions usually narrow the options faster than a long property chart:

• Where will it be used? Outdoor products may face sunlight, rain, condensation, and temperature swings.
• Will it be dropped? Portable and handheld products usually need more impact resistance.
• How much heat is present? Check heat from the PCB, batteries, power supplies, and surrounding equipment.
• Is a flame rating required? The exact resin grade, color, and wall thickness may all matter.
• Does the product use wireless signals? Metal or conductive coatings may affect Wi-Fi, Bluetooth, GPS, and other signals.
• What should it look like? Texture, color, gloss, printing, and paint can rule out some materials.
• Will it contact chemicals? Cleaners, oils, fuels, or industrial fluids may attack certain plastics.
• How many parts will be made? The resin should run consistently at the expected production volume.

You probably will not need every property at the highest level. A desktop controller may care more about appearance and cost. An outdoor sensor may put UV stability and sealing first.

Common Plastic Materials for Electronic Enclosures

ABS, PC, PC+ABS, ASA, and PP are material families. Each one includes many grades with different fillers, flame ratings, UV packages, colors, and processing requirements.

That matters because “PC” or “ABS” alone is not a complete material specification. The grade on the data sheet is what the mold and product will actually use.

ABS

ABS is a common starting point for indoor housings. It offers a good mix of stiffness, toughness, appearance, and cost, and it works well with texture, color, printing, and painting.

It is often used for routers, controllers, appliance parts, and consumer devices. Standard ABS is less suitable for long-term sunlight exposure, though, and some projects may need a flame-retardant or higher-heat grade. See more examples in ABS electronic enclosures.

Polycarbonate

PC is worth considering when the enclosure needs more impact resistance, better heat performance, or a transparent area. It is often used for windows, light covers, protective housings, and portable equipment.

The performance of polycarbonate enclosure materials depends heavily on the grade and part design. PC usually costs more than ABS, requires proper drying, and can be sensitive to some chemicals or high molded-in stress.

PC+ABS

PC+ABS often sits between ABS and PC. It can give you more toughness and heat resistance than standard ABS without moving fully to pure PC.

This makes it useful for handheld products, controllers, automotive electronics, and visible equipment housings. Still, do not assume all PC+ABS grades behave alike. The blend ratio and additives can change the result quite a lot.

ASA

ASA looks and processes much like ABS, but it generally holds up better under sunlight. That is why it is often considered for outdoor controls, sensors, communication devices, and other exposed housings.

Would ASA automatically solve every outdoor problem? No. You still need to check moisture, temperature cycling, sealing, impact, and chemical contact. The resin grade and enclosure design work together.

Polypropylene

PP is light, chemically resistant, and good for repeated flexing. It can work well for covers, battery doors, clips, caps, and living hinges.

The trade-off is lower stiffness and weaker dimensional stability than ABS or PC+ABS. PP may need more ribs, and it can be harder to paint, print, or bond. For a high-appearance housing, that may matter more than the resin price.

Electronic Enclosure Material Comparison

This table gives a practical overview of common consumer electronics plastic enclosure materials. Use it to build a shortlist, not to approve a final grade.

Factor	ABS	PC	PC+ABS	ASA	PP
Relative cost	Low to moderate	Moderate to high	Moderate	Moderate	Usually low
Impact resistance	Good	High	Good to high	Good	Grade-dependent
Heat resistance	Moderate	Good	Moderate to good	Moderate	Moderate
Outdoor use	Limited for standard grades	Grade-dependent	Grade-dependent	Generally good	Grade-dependent
Surface quality	Good	Good	Good	Good	Moderate
Typical use	Indoor housings	Tough or transparent parts	Controllers and handheld devices	Outdoor housings	Covers and chemical-resistant parts

The table shows general tendencies. A UV-stabilized PC can behave very differently from a standard grade, just as flame-retardant ABS differs from ordinary ABS.

Additives can also change shrinkage, surface quality, strength, and cost. The final choice should be checked against the supplier’s technical data and tested in the actual part.

How Do You Choose for a Real Product?

A useful way to choose is to start with the product type. Ask what is most likely to fail: the surface, the clips, the housing after a drop, or the material after outdoor exposure?

Indoor Consumer Electronics

For many indoor products, ABS is a sensible first option. It usually gives a clean surface, enough toughness, and a reasonable cost.

If the housing runs hotter or takes more abuse, compare PC+ABS. Use pure PC where transparency or high impact resistance is a real requirement, not simply because it sounds stronger.

Outdoor Electronic Equipment

Outdoor products face more than UV light. Rain, condensation, temperature changes, impact, and color fading all matter over time.

ASA is often a good candidate for outdoor exposure. Selected PC grades may also work, especially where the product needs more impact resistance or a clear window. The gasket, joint, and drainage design still need equal attention.

Handheld and Portable Products

A handheld enclosure may be dropped, twisted, opened, and closed hundreds of times. Stress tends to collect around corners, screw bosses, clips, and battery covers.

PC and PC+ABS are common options, but material alone will not save a weak design. Wall thickness, radii, ribs, PCB support, and internal clearances all affect drop performance.

Chemical-Resistant Enclosures

Do not rely on a broad phrase such as “good chemical resistance.” Ask which chemical is involved, at what concentration, at what temperature, and for how long.

PP performs well around many cleaners, oils, and industrial chemicals. But check whether its stiffness, appearance, and dimensional behavior still suit the enclosure.

How Material Choice Affects PCB Enclosure Design

Material selection and PCB enclosure design should happen together. Resin stiffness affects wall thickness and ribs, while material flexibility affects clips and snap-fits.

Screw bosses also behave differently from one material to another. A stiff but stress-sensitive resin may crack near an insert or overtightened screw. A softer resin may bend unless the boss has enough support.

The production material should be confirmed before final mold sizing. Changing from ABS to PP or PC after tooling can alter shrinkage, warpage, connector positions, and assembly gaps. A plastic enclosure design review can help connect the resin choice with the actual structure.

When Is Metal Better Than Plastic?

Metal may be the better option if the housing needs strong heat dissipation, natural EMI or RFI shielding, very high rigidity, or heavy-duty industrial protection. It can also make sense for low-volume products made from sheet metal.

Plastic is often more suitable when the product needs low weight, electrical insulation, molded internal features, or wireless signals passing through the housing. It also becomes more attractive at medium and high production volumes.

Some products use both. A plastic outer shell can support wireless communication, while internal metal parts handle shielding or heat.

What Information Should You Prepare?

For a custom plastic enclosure for PCB, you do not need every detail finalized before talking with a molding supplier. But the more clearly you describe the product, the more useful the material recommendation will be.

Prepare:

• PCB dimensions and mounting points
• CAD files and current drawings
• Indoor or outdoor use
• Working and storage temperatures
• Impact or drop requirements
• Flame or regulatory requirements
• Wireless communication needs
• Color, texture, and finish
• Sealing requirements
• Expected annual volume
• Printing, inserts, welding, and assembly needs

This information supports a more useful part design and DFM review. It also helps catch conflicts between the resin, mold, appearance, and assembly plan before tooling begins.

FAQs

Can transparent and opaque parts use the same plastic?

Sometimes. Transparent and colored PC grades may have different UV, flame, and processing requirements. Check each grade separately.

Does a flame rating apply to every color?

Not always. Color, additives, and wall thickness can affect the approved rating. Confirm the exact grade and finished wall thickness.

Can the resin be changed after the mold is built?

Possibly, but it carries risk. Different shrinkage and flow behavior can change dimensions, warpage, surface quality, and fit.

Can recycled resin be used for electronic housings?

Yes, for some products. Check color, odor, strength, flame performance, consistency, appearance, and any regulatory limits before approval.

Conclusion

There is no single best option among electronic enclosure materials. ABS suits many indoor housings, PC and PC+ABS work well where impact or heat matters more, ASA is useful outdoors, and PP fits some chemical-resistant or cost-sensitive parts.

For a custom PCB enclosure, prepare the CAD files, PCB layout, working environment, material requirements, volume, and assembly details. HingTung supports material review, DFM, mold design and manufacturing, injection molding, secondary processing, assembly, and quality inspection. You can also discuss a custom PCB enclosure before tooling begins.