It is a colorless viscous liquid that solidifies to a rigid glass upon cooling at −78 °C (−108 °F).

[2][1] Fluorophosphoric acid is produced commercially by treating phosphorus pentoxide with hydrogen fluoride.

Ingestion can cause severe burns and permanent damage to gastrointestinal system.

Inhalation of this acid may cause severe burns to respiratory system and chemical pneumonia.

Inhalation, ingestion or contact with skin with this acid may cause severe injury or death.