The short answer
Most dash cam housings are injection-molded plastic, usually ABS, polycarbonate (PC), or a PC+ABS blend, sometimes with a metal or metal-look part for trim or a heat spreader. ABS is easy to mold and finish. PC is tougher and holds shape at higher temperature. PC+ABS blends try to combine the two. The right choice depends on the product: a mirror dash cam with a large screen has different needs from a small hidden unit. The cabin of a parked car in sun is a harsh environment, so a buyer should ask for the material in writing, a heat test, and a sample left in warmth before agreeing to bulk. This note is general; the actual material per model is confirmed in the specification.
The common materials compared
| Material | Typical strengths | Typical watch points |
|---|---|---|
| ABS | Easy to mold, good surface finish, widely used | Softens at lower temperature than PC, can warp in hot cabins if walls are thin |
| PC | Strong, impact resistant, handles higher heat | Can scratch, can show stress marks, may need coating for finish |
| PC+ABS blend | Balance of toughness, heat resistance and moldability | Blend ratio and grade vary between suppliers |
| Metal parts | Heat spreading, premium feel, rigid mount | May affect antenna performance, adds weight |
| Rubber or soft-touch | Grip and sealing at buttons and ports | Can degrade with heat and sun over time |
These are general characteristics. Specific grades differ, and a flame-retardant or UV-stable grade behaves differently from a general one. That is why the specification should name the grade or at least the family, and why a material declaration is worth asking for.
Why heat is the central issue
A parked car in summer can become very hot, and a dash cam sits at the warmest spot, directly under the windshield. Heat can warp a shell, loosen the mount, discolor the finish, soften adhesives and shorten component life. The housing also traps heat produced by the chipset and, in a 4K model, the encoder works hard. Good designs use wall thickness, vent or heat-spreading features and a surface that does not absorb too much light. Heat also connects to the power buffer choice: supercapacitor models tolerate it better than lithium battery models, covered in supercapacitor versus battery, and to climate expectations in hot and cold climates.
Fit, finish and tolerances
Materials are only half the story. Mold quality decides how well the two halves of the shell meet, how clean the parting line looks, whether buttons stick and whether the lens window sits flush. Poor molds create gaps that let dust in, rattle in the mount and visible flash at the edges. Painted or textured finishes add another set of variables: a coating that looks good at the sample stage can peel when sprayed in volume, or fade under sun. Look at the sample from several angles, press all buttons and gently twist the shell. For custom designs, ask to see mold trial shots before volume, and remember that new tooling has its own cost and time, discussed for OEM and ODM programs on that page.
Radio and electronics inside the shell
GPS and WiFi antennas must receive through the housing, so metal near an antenna can hurt performance. Many designs use plastic over the antenna zone and place metal elsewhere. If a housing has metal trim, check GPS lock time and WiFi range on the sample. Conformal coatings and shielding inside the shell are other details; they are described in the factory's design notes rather than visible from outside. The functional testing note lists those radio checks.
Environmental and regulatory points
Plastics and additives fall under restricted substance rules in markets such as the EU, where RoHS applies to electronics. A material declaration from the factory states what the shell is made of and supports compliance files. Ask for it together with the test reports for your market; certificates come from the producing factory or lab and are verified by report number, as covered in RoHS and WEEE for importers and on the certifications page. The desk does not hold certificates itself.
What to ask and what to test
- Material in writing. Which plastic or blend, which grade family, any metal parts.
- Material declaration supporting the restricted-substance file for your market.
- Heat test. Leave a sample in a warm space, then check fit, buttons, lens position and recording.
- Drop and press checks on buttons, mount joint and card door.
- Finish in volume. Compare the golden sample with a pre-shipment sample for color, gloss and scratches.
- Radio check if there is any metal near antennas.
Housings for different product types
The material question changes with the product. A hidden mini unit lives behind the mirror where sun exposure is partial and the shell is small, so a standard blend is usually enough and the mount matters more than the shell. A mirror dash cam carries a large screen and clips over an existing mirror, so rigidity, screen bonding and the clip mechanism carry the risk, and a warped shell shows immediately as a crooked mirror. A rideshare unit with an infrared cabin camera needs a window or aperture that IR light passes through, which narrows material and coating choices. Rear cameras sit outside the cabin on some vehicles, so they face water, wash pressure and stone hits, and sealing becomes the central question rather than heat alone. When you brief a program, say where the unit will be mounted and in which vehicles; the desk uses that to agree the housing family and the heat or sealing tests with the factory, instead of leaving the choice to whichever shell is on the shelf.
Color matching is another common source of disagreement. Black and dark gray shells can differ slightly between batches, and a retail box shot may not match. Agree on a color reference and tolerance with the golden sample. The desk can add these to the program sheet; send the target market and climate with your brief through the quote form.