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Material Specifications

Material Specifications

Material Specifications

WAGO primarily uses polyamide (PA 6.6 and PA 4.6) as carriers of current-conducting parts and polycarbonate (PC) as insulating material (see table). These materials have proven their value in WAGO products for more than 40 years and are approved by the responsible test authorities.

MaterialPA 6.6PA 4.6 PC
Flammability test according to UL 94, rating
Glow-wire test to IEC 60695-2-10/11+12960°C ...850°C ...850°C ...
Comparative Tracking Index (CTI) to IEC 60112 600 V2726
Heat deflection temperature HDT/B (0.45 Mpa) short 200°C short 280°C 140°C ...
with mechanical stress continuous 105°C continuous 115°C 125°C ...
Thermal stability Ball indentation hardness test to EN ISO 2039-1 Test device B 125°C passed125°C passed125°C passed
Surface resistance 1010 -1013 ?1013 -1016 ?1015 ?
Specific contact resistance1015 ? / cm109 -1015 ? / cm1013 ? / cm
Dielectric strength 30 kV / mm25 kV / mm29 kV / mm

Polyamide (PA 6.6)

WAGO uses a modified nylon that is free of halogens, chlorinated hydrocarbons, silicone, asbestos, cadmium and formaldehyde.

This material does not corrode, is barely flammable, self-extinguishing (V0 rating to UL 94) and is temperature-stabilized, allowing long-term temperature resistance up to 105°C (221°F).

This long-term thermal stability refers to the UL mechanical impact RTI (relative temperature index), in order to guarantee an adequate safety margin in terms of the electrical and mechanical insulation properties.

The short-term upper temperature limit is 200°C (392°F). The same philosophy also forms the basis for data relevant to the lower temperature limit. The insulation material can be handled at temperatures as low as -35°C (-31°F) without damage. After installation and wiring, WAGO products can even be used at temperatures down to -60°C (-76°F).

Environmental humidity (up to 2.5% on average) is absorbed chemically, achieving an optimum elasticity and fracture safety.

In practical use, basic stabilization provides sufficient protections against damage by ozone or ultraviolet light for long-term use. Resistance against adverse climate conditions is excellent and nylon has proven itself in tropical applications.

Molded parts from polyamide are termite-resistant. The material does not provide oxygen or other biogenic elements to microorganisms. The presence of anaerobic earth bacteria, mold, fungus and enzymes does not result in degradation of the material. This insulating material has been found to be extremely resistant against fuels, most oils and greases, as well as the most common cleaning agents such as isopropyl, freon, freon 1, carbon tetrachlorides. Acid resistance depends on the acid type and concentration. More details are available upon request.

WAGO only accepts deliveries of granular insulation material against certificates of conformity and after specified material tests.

Nylon (PA 4.6)

In comparison with nylon 6.6, nylon 4.6 features a much higher dimensional stability under heat.

Its long-term temperature resistance under mechanical stress is 115°C (239°F). Long-term heat resistance after 10,000 hours is 140°C (284°F). The short-time upper temperature limit is 280°C (536°F) for nylon 4.6 used by WAGO.

For more information, see table.

Polycarbonate (PC)

Some typical properties of polycarbonate include:

  • PC has a high deformation resistance under heat. It has a high resistance, rigidity, hardness and viscosity up to 135 ° C.
  • Good electrical properties, also unaffected by exposure to moisture. Its insulation properties are virtually independent of temperature and humidity.
  • High dimensional stability achieved by low shrinkage due to low water absorption (approx. 0.2% relative humidity)
  • High weather resistance
  • High resistance to energetic radiation
  • Self-extinguishing
  • Crystal-clear transparency and high surface gloss

The PC used has a very high viscosity and chemical resistance. More details are available 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.

Polythalamide (PPA - High Performance polyamide)

PPA is employed as the insulating housing material in some of WAGO's latest developments including surface mount PCB terminal blocks (e.g., 2060 Series) and picoMAX® connection system.

Like PA 6.6, PPA has a flammability rating of V0 per UL 94, but was selected for these new products for its superior structural integrity at elevated temperatures (RTI-electrical = 140° C). It is suitable for lead-free wave- and reflow- soldering processes; it withstands 260° C for up to 10 seconds during the soldering process.

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