joints for heating Belgium

...Coref flue liners made of terracotta or refractory clay, with square or rectangular sections ranging from 140x140 mm to 500x500 mm, and with solid walls or composed of small cells, are used for the smoke ducts of heating systems operating with any type of fuel. Each Coref flue liner features a male end and a socket at both ends to prevent any leakage of condensates. The connection is made with the male end facing downwards. The joints are made using Refraco refractory mortar. Coref flue liners are extremely resistant to thermal shocks and potential acids (which can cause corrosion).