ABEK1 Multi-Gas Filter X703 Oxyline (1 Pair)

The chemical filter you need to sublimate oxalic acid and apply formic acid safely

🌿 ABEK1 Protection: four types of vapours in a single cartridge

The letters ABEK are not marketing: they identify the types of contaminants the filter retains. A (brown): organic vapours with a boiling point above 65 °C. B (grey): inorganic vapours, except carbon monoxide. E (yellow): sulphur dioxide and acid vapours. K (green): ammonia and derivatives. For oxalic acid sublimation and formic acid evaporation, classes E (acids) and A (organics) do the heavy lifting, but having all four classes gives you an extra safety margin against any compound generated during treatment.

💡 When to replace them

Chemical filters last significantly longer than pre-filters, but they are not everlasting. The replacement signal is straightforward: when you start to smell odours through the mask, the activated carbon has exhausted its absorption capacity and it is time to swap them out. Always store them in their original packaging, at a temperature between -20 °C and +30 °C, with humidity below 80% and without any filtration elements attached. Their rearward-angled design improves the field of vision when mounted on the mask.