SIST EN ISO 10370:2015 PDF

Overview

EN ISO 10370:2014 - Petroleum products - Determination of carbon residue (micro method) specifies a laboratory micro-method to measure the amount of carbon residue remaining after controlled evaporation and pyrolysis of petroleum products. The method covers residues in the range 0.10 % (m/m) to 30.0 % (m/m) and is widely used as an indicator of a product’s tendency to form carbonaceous deposits under thermal degradation.

Key topics and technical requirements

• Principle: A weighed aliquot of sample is heated to 500 °C under an inert (nitrogen) purge; volatiles are swept away and the remaining carbonaceous residue is weighed.
• Sample vials: Typical vials are 2 ml (12 mm × ~35 mm). 4 ml vials or larger (≈20 ml) may be used for very low-residue samples to improve measurement sensitivity.
• Apparatus: Requires a coking oven (controlled heating 10–40 °C/min), nitrogen supply (low O2, ≥ 99.998 % (V/V)), thermocouple (450–550 °C range), analytical balance (0.1 mg sensitivity), and a vial holder.
• Scope specifics:
  • Applicable to distillate materials; for very volatile distillates a 10 % (V/V) distillation residue can be prepared before analysis.
  • Ash-forming constituents and non‑volatile additives contribute to the reported carbon residue value.
  • Presence of organic/alkyl nitrates may produce anomalously high values (ISO 13759 can be used for detection).
• Equivalence: For residues >0.10 % (m/m), results are equivalent to the Conradson carbon residue test (ISO 6615) within 0.10–25.0 % (see Annex A).
• Quality data: Precision information (repeatability and reproducibility) and reporting details are provided in Clauses 12 and 13 of the standard.

Applications and users

• Quality control in petroleum refining and fuel production to monitor carbon-forming tendency.
• Fuel suppliers, lubricant manufacturers, and additive developers assessing deposit tendencies and product stability.
• Research & development and engine testing teams evaluating fuel behavior under pyrolytic conditions.
• Regulatory and standards laboratories comparing micro-method results with Conradson values.

Practical keywords: carbon residue micro method, ISO 10370:2014, petroleum products testing, Conradson equivalence, nitrogen purge coking oven, distillate residue.

Related standards

• ISO 6615 - Conradson carbon residue method (reference for equivalence)
• ISO 6245 - Determination of ash-forming constituents
• ISO 13759 - Detection of alkyl nitrates in fuels
• ISO 3405 - Distillation characteristics (used for preparing 10 % V/V residue)

This standard is essential for laboratories performing routine carbon residue testing and for stakeholders evaluating the carbon‑forming tendencies of petroleum-derived products.