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Frigutec® Engine coolants

Frigutec® HDC

Frigutec® HDC for heavy-duty engines is a modern low silicate coolant concentrate with the latest low silicate Si-OAT corrosion protection technology combined based on monoethylene glycol and a nitrite additive for the best possible cavitation protection.

Frigutec® HDC has been specially developed for heavy-duty cast iron diesel engines operating under special operating characteristics with a long duty cycle at or near the maximum rated conditions. Such engines are typically used in off-highway machinery for agriculture, mining, earthmoving, construction, high power stationary engines, locomotives, and marine engines.

Frigutec® HDC is free of 2-ethylhexanoic acid, borate, phosphate, and amines. We recommend Frigutec® HDC only for vehicles where nitrite containing coolants are specified according to ASTM D4985 and ASTM D6210. For all other heavy-duty engines, we recommend to use our Frigutec® OAT-EVO.

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Product details


Frigutec® HDC offers the user the following advantages:

  • Excellent cavitation protection
  • Effective corrosion protection
  • long-term protection for at least 500.000 km or approx. 7.000 hours in commercial vehicles with nitrite systems
  • Effective protection against pitting
  • Free of 2-ethylhexanoic acid
  • In the correct 50/50 ratio with demi water, optimum frost protection down to -38°C
  • Compatible with all common nitrite containing engine coolants
  • For all high-performance diesel petrol and natural gas engines
  • Exceeds the requirements of ASTM D4985 and ASTM D6210
  • weekly, monthly, quarterly, and seasonal prices

Standards and OEM recommendations

Frigutec® HDC has no OEM approvals. Frigutec® HDC was specially developed as nitrite-containing engine coolants for heavy-duty engines. As a premium coolant, we recommend it for a wide range of the OEM vehicles and international standards.

Please request our complete OEM recommendation list.


Frigutec® HDC offers excellent year-round protection against frost and corrosion.

Frigutec® HDC concentrate must be diluted with water before use.
We recommend a mixing ratio of 50:50 vol.% with demineralised or distilled water. Under no circumstances should Frigutec® HDC be used with less than 33 vol.% or more than 60 vol.%.

Physical and chemical properties

We will be happy to inform you personally about the physical and chemical properties of our coolants. We look forward to your enquiry.

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