Silicone rubber can generally be divided into room - temperature vulcanized silicone rubber (RTV) and high - temperature vulcanized silicone rubber (HTV). The differences in the applications of different types of silicone rubber in the field of lighting fixtures are mainly reflected in the following aspects:
Sealing
Room - temperature vulcanized silicone rubber


One - component RTV: It has good moisture - curing properties. In the sealing of lighting fixtures, it can be conveniently used for sealing small - area and irregular parts, such as the sealing of small holes and gaps on the lamp housing. It can react with moisture in the air at room temperature and cure to form a sealing layer. The operation is simple, no additional heating equipment is required, and it can be constructed directly on - site.
Two - component RTV: Its curing speed is adjustable, which has more advantages for large - scale lighting fixtures or occasions that require rapid sealing. Its vulcanization speed is faster than that of the one - component type, and it can reach a relatively high strength in a short time to form a reliable seal. It is widely used in the manufacturing of some lighting fixtures with high sealing requirements and fast production speed, such as the sealing and assembly of outdoor high - mast street lamps.
High - temperature vulcanized silicone rubber: During the long - term use of lighting fixtures, it can better maintain the sealing performance. It can be used to manufacture various complex - shaped seals, such as the sealing rings between the lamp cover and the lamp body of large - scale chandeliers. After high - temperature vulcanization, it has higher strength and stability, can withstand greater pressure and deformation, and is suitable for lighting fixtures with extremely high requirements for sealing reliability, especially those used in harsh environments.
Heat Dissipation
Room - temperature vulcanized silicone rubber: Usually, it has certain flexibility and thermal conductivity and can be used as a thermal conductive adhesive. It is used to paste heat sinks or fill the tiny gaps between heating elements and heat sinks, which can help with heat dissipation to a certain extent. It is more suitable for some small - sized lighting fixtures with not extremely strict heat - dissipation requirements. For example, in ordinary LED downlights, RTV silicone rubber can be used to paste and fix the LED chip and the heat - dissipation substrate to play an auxiliary role in heat dissipation.
High - temperature vulcanized silicone rubber: It can be made into heat - dissipation pads with better thermal conductivity and is widely used in lighting fixtures with high heat - dissipation requirements, such as high - power LED lighting fixtures. HTV silicone rubber heat - dissipation pads can withstand higher temperatures, and can still maintain stable thermal conductivity and physical properties at high temperatures. It can effectively transfer the heat generated by heating elements such as LED chips to the heat sink, improve the heat - dissipation efficiency of the lighting fixture, and extend the service life of the lighting fixture.
Optical Components
Room - temperature vulcanized silicone rubber: It can be used for the sealing and fixing of optical components in some lighting fixtures with relatively low requirements for optical performance, such as the sealing of the edges of lenses in some ordinary lighting fixtures. After curing, it can maintain a certain degree of transparency and will not block light too much, but its optical performance stability is slightly worse than that of HTV.
High - temperature vulcanized silicone rubber: It has better optical stability and transparency and can be used to manufacture lenses and lamp covers for high - end lighting fixtures. It is not easy to turn yellow or age under long - term illumination, can better maintain the light transmittance and optical performance, and can precisely control the propagation and distribution of light to meet the design requirements of some lighting fixtures with extremely high requirements for optical effects, such as stage lights and automobile headlights.
Installation and Fixation
Room - temperature vulcanized silicone rubber: It can be used to make some temporary or adjustable installation accessories, such as rubber pads for temporarily fixing lamp components. After curing, it has certain flexibility and adhesiveness, can play a role in buffering and fixing to a certain extent, and is convenient for position adjustment and fixation during the installation of lighting fixtures.
High - temperature vulcanized silicone rubber: It has more advantages in manufacturing permanent installation accessories for lighting fixtures, such as hooks and bracket pads. It has higher strength and wear resistance, can stably bear the weight of the lighting fixture for a long time, provide reliable support and fixation, ensure the safety and stability of the lighting fixture during use, and is suitable for the installation of various types of lighting fixtures.


Low compression set precipitated silicone rubber