Wires Covered with Silicone or PVC: Which is the Better Choice?

Our TRH (temperature and relative humidity sensors) and PTH (temperature, relative humidity and atmospheric pressure sensors) instrument series offer an aluminum-covered sensor connected to the housing by a silicone-covered cable (TRH450, PTH450). Beyond this additional sensor protection, how does using a silicone cable contribute more to the robustness of these products?


PVC-Coated Cables

PTH420: USB-connected precision (±0.1°C/±1.5 %RH) temperature, relative humidity and atmospheric pressure measuring instrument (sensor) - Front view with USB Plug

Silicone-Coated Cables

PTH450: Improved accuracy (±0.1°C/±1.5 %RH) temperature, relative humidity and atmospheric pressure measuring instrument with USB connection, particle filter and aluminum tip for harsh environments - Front view with USB plug

Temperature range

-20°C to +70°C

-50°C to +200°C


Good flexibility at normal temperatures

Excellent flexibility, even at low temperatures

Chemical resistance

Moderate resistance to certain chemicals and oils

Resistant to oils, solvents, chemicals, and UV rays

Electrical insulation

Provides basic electrical insulation

Excellent electrical insulation properties

Fire resistance

Moderate flame retardant properties

High flame retardant properties

Compression resistance

Moderate resistance; may be damaged after compression

Excellent continuous compression resistance

Mechanical strength

Excellent resistance to mechanical stress

Moderate resistance to mechanical stress

Applications (examples)

Commonly used in building wiring, electrical distribution, appliances, and versatile electrical applications

Suitable for high-temperature environments and outdoor uses (e.g., solar panels), aerospace, automotive, industrial machinery, and electrical equipment

When choosing between silicone-coated and PVC-coated cables, it's essential to consider the application's specific requirements, such as temperature range, environmental conditions, mechanical strength, and budget constraints, as silicone-coated wires tend to be more expensive. Each type of cable offers distinct advantages and disadvantages, allowing you to select the option that best suits the intended use.

A dedicated article is available if you want to learn more about the robustness elements of Dracal products. Additionally, we have created a comparison table for the TRH series regarding different probes and their protection if you wish to explore this specific aspect of robustness.