WAGO preferably uses polyamide (PA 6.6 and PA 4.6) as carriers of current-conducting parts and polycarbonate (PC) as insulating material (see table). They have proven their practical value in WAGO products for more than 40 years and are approved by the responsible test authorities.
Table: Standard insulating materials
Flammability test UL 94, assessment
|Glim wire test per IEC 60695-2-10/11+12||960 °C||850 °C||850 °C|
|Resistance to creepage per IEC 60112 CTI||600||375||275|
|Thermal stability HDT/B (0.45 Mpa)||short 200 °C||short 280 °C||140 °C|
|with mechanical stress||continuous 105 °C||continuous 115 °C||125 °C|
Ball impression test per EN ISO 2039-1
Test device B
|125 °C passed||125 °C passed||125 °C passed|
|Surface resistance||1010 -1013 Ω||1013 -1016 Ω||1015 Ω|
|Spec. volume resistance||1015 Ω / cm||109 -1015 Ω / cm||1013 Ω / cm|
|Electric strength||30 kV / mm||25 kV / mm||29 kV / mm|
Polyamide (PA 6.6)Polyamide (PA 6.6) WAGO uses a modified PA, free of halogen, fluorocarbons, hydrogen chlorides, silicones, asbestos, cadmium and formaldehydes.
The material is corrosion-neutral and has hardly flammable, slf-extinguishing properties (classification per UL 94, V0), for a steady-state temperature strength of 105 °C.
This steady-state temperature strength refers to the mechanical stress, as per UL Index RTI Mechanical STR, in order to maintain all electrical and mechanical isolating properties with a sufficient safety margin.
The short-term upper temperature limit is 200 °C. The same safety philosophy is also the basis for the lower limit temperature. At temperatures to -35°C, it is assurend that a damage to the insulating material does not occur during operation. When mounted and wired, all WAGO products can be used up to -60°C.
Environmental humidity, in the average to 2.5%, is absorbed chemically, achieving an optimum elasticity and fracture safety.
The basic stabilization has proven over many years in the field, to be sufficient as protection against ozone or UV radiation. The weather proof properties are good and PA has proven itself in tropical applications.
Molded parts from polyamide are termit-resistant. Microorganisms will not detect a source of oxygen or other biogenous elements. Anaerobic earth bacteria cultures, as well as mould fungus and enzymes do not generate adverse changes. This insulating material has bben found to be extremely resistant against fuels, most oils and greases, as well as the most common cleaning agents such as isopropyl, freon, freon 12, carbon tetrachlorides. The acid resistance deepnds on the acid type and concentration. Statement upon request
The material approval of the insulating material granulates is principally performed with factory testimony and specified material tests at WAGO.
Polyamide (PA 4.6)Much higher deformation resistance under heat conditions compared to PA 6.6. Steady-state temperature resistance at mechanical stress is listed at 115°C. Steady-heat resistance is listed as 140 °C. The PA 4.6 type used by WAGO, may be used at 280°C for a short time.
Please see table for additional information.
Polykarbonat (PC)Some characterizing properties are:
- PC has a high deformation resistance under heat. High solidity, rigidity, hardness and viscosity at temperatures up to 135° C.
- Good electrical properties not affected by humidity. The isolating properties are nearly independent from temperature and humidity.
- High thermostability due to low shrinkage for low water retention (relative humidity approx. 0.2%).
- High weather resistance
- High resistance against energy-rich radiation
- crystal clear transparency and high surface sheen
The PC used is a highly viscosic type with high resistsance to chemicals. Statements upon request. Due to the whole set of properties, e.g. heat resistance, low flammability, transparency and viscosity, PC is a valuable material with comprehensive utilization in electrical engineering.