As we know, the rearview mirror is divided into outer rearview mirror and inner rearview mirror.
A typical external rear-view mirror is composed of nearly 20 parts, among which plastic materials are mainly used in the rear-view mirror case, mirror case base, bracket and triangle plate.
These pieces play a different function or appearance, the performance requirements of the material are different, and then we give a detailed description of its material selection.
01
Rearview mirror housing
Rear-view mirror shell is generally designed to be the same color of the body, and most of them are high-gloss effect, so most of them are sprayed, and a few electroplating schemes can also be adopted to reduce the pressure of environmental protection.
|
Common scheme of rearview mirror housing Characteristics of post-processing and material selection |
|||
|
program |
post processing |
material |
characteristic |
|
spray lacquer |
spray lacquer |
PC ABS |
The colors are varied; Good weather and scratch resistance |
|
electroplate |
heat-resistingABS |
Part or all electroplating, high cost, multi - high-end car use |
|
| Avoid spraying | nothing | heat-resistingABS |
Good weather resistance |
Rearview mirror - white upper housing, PMMA/ASA M1600
Rear view mirror - black lower housing, PMMA/ASA M1800
02
Mirror shell base
The mirror housing base plays an assembly and transition role, so ASA or PP+MD is preferred.
|
Common scheme of mirror housing base Characteristics of post-processing and material selection |
||
|
program |
material |
characteristic |
|
post processing |
Heat ASA
Specular ASA
PMMA/ASA |
Good weather resistance
Highlight black effect
Black bright effect, good weather resistance |
| nothing | PP+MD | low coat |
Specular black mirror housing base, PMMA/ASA M1800
03
Rearview mirror holder
The rear-view mirror bracket mainly plays a supporting role, requiring high rigidity, good appearance, good weather resistance, can choose metal parts, plastic parts or metal and plastic combination, most choose aluminum alloy, PA+GF or PBT+GF.
|
Common scheme of rearview mirror bracket Characteristics of post-processing and material selection |
||
|
postprocessing |
material |
characteristic |
| nothing |
Aluminum alloy +ASA, etc |
High rigidity, high toughness, high density, high cost |
| nothing | PA+GF |
hive consideration to toughness, poor dimensional stability, aging resistance |
| nothing | PBT+GF |
High rigidity, good dimensional stability, good surface, low cost |
Rearview mirror bracket, PBT+30%GF PBT 3730G
The triangle plate of the rear-view mirror is the part connected with the car window, which is mostly formed with the rear-view mirror bracket. If it is formed separately, the selected materials are metal, ASA or PC/ASA.
Above are the material selection and characteristics of the external rearview mirror.
