Skeletons and substrates are usually made of good insulating materials, requiring heat resistance, moisture resistance, good electrical insulation, chemical stability and thermal conductivity, and only a certain degree of mechanical strength. Generally speaking, there are laminated cardboard, laminated cloth, plastic, ceramics, glass and copper, aluminum and aluminum alloy insulation surface, the surface through the metal matrix insulation, should have enough surface insulation, the skeleton matrix has good heat dissipation, but also easy to form.

The main functions of the linear slide potentiometer are as follows.

1. Resistor body
Resistor is a resistance element which provides a certain value of resistance for potentiometers. It determines the main electrical characteristics of linear slide potentiometer. The resistor should have good stability, smaller resistance temperature coefficient and quiet noise. In order to improve reliability, it should also have moisture resistance, heat resistance, wear resistance, oxidation resistance, high load resistance and cold resistance mutation performance.
The contact resistance of the contact potentiometer, which contacts and slides with the movable contact, makes the surface of the resistance element have low resistivity, which makes the contact resistance with the movable contact small; moreover, the surface resistivity should be uniformly distributed and the contact resistance change within the effective electrical stroke and the track resistance change is small, so the ideal resistance characteristics can be obtained. The resistance surface should have proper finish, hardness and wear resistance to ensure its mechanical durability. Wire-wound potentiometer is a kind of resistance wire around the skeleton. It is composed of round or spiral resistance, thin film or thick film potentiometer. It is a resistance film forming a common substrate. It is horseshoe-shaped, round or long tripping. For the synthetic core potentiometer, it is based on the compression molding of horseshoe or strip resistance track.

2. Skeleton and matrix
The skeleton is the insulation support of the wire wound resistor. The substrate (or substrate) is supported by a non wire wound potentiometer resistor.

3. Brush
Vibrator along the linear slide potentiometer, and the input voltage moving contact parts called brushes or touch brushes are divided into two categories: one is a metal brush. That is, the metal material produced by the brush; the other is the carbon brush, which is made of carbon and other mixed materials. The shape of the metal brush is brush shaped, punctate, spherical, and multi fingered. The effect of multi finger brush is the best when ensuring the reliability of uniform distribution of current and current. The shape of carbon brush is cone and rectangle. Contact surfaces have flat and spherical surfaces, contact reliability of 100k linear slide potentiometer, low noise, mechanical durability and service life, and contact state is associated with mechanical wear. Therefore, brush materials should be corrosion-resistant, oxidation-resistant, heat-resistant, cold-resistant; good thermal conductivity, good conductivity, non-magnetic, low contact resistance, high wear resistance and good mechanical strength and so on. Brush and resistor have been in contact and friction state, the two materials with appropriate combination to obtain a small contact resistance and good wear resistance. If the combination is unsuitable, one of them may wear out very quickly. Compared with 100k linear slide potentiometer, brush hardness and wear resistance should be slightly lower, so that resistor damage, to ensure its reliability. When using carbon brush, the resistance of 100k linear slide potentiometer is largely influenced by the resistance of carbon brush. The resistance of carbon brush is lower than that of carbon black and graphite in formula. High carbon content is low, but strength is poor. For high carbon brushes, metal powder (such as silver) is sometimes added to reduce resistance. The smaller the carbon brush, the better resistance, generally less than 6 ohms. The strength of carbon brush is the maximum pressure that carbon brush can bear. High strength can withstand large pressure, so resistance resistance contact resistance is small.