ISO-4262
Ramsbottom Carbon Residue of Petroleum Products

This test measures the coke-forming propensity of oils under extreme temperatures causing cracking and pyrolysis.  The sample is placed in a glass bulb and heated in a furnace at 550°C for 20 minutes to evaporate and reduce the material to a coke residue or 'carbon residue'.  Ash forming additives can give erroneous indication of coke-forming tendencies by adding to the weight of residue formed.  Carbon residue is a useful guide in the manufacture of oils and finished lubricants.  Results differ from those obtained by ASTM  D-189.

Also see:    D-524

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