ISO 7536:1994 PDF

Petroleum products — Determination of oxidation stability of gasoline — Induction period method

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Title (English):

ISO 7536:1994

Petroleum products — Determination of oxidation stability of gasoline — Induction period method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 9
Publication date:: July 21, 1994
Edition:: ISO IS 7536 edition 1 version 1
ICS:: 75.160.20

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Description (English):

The principle of the method specified is oxidizing the sample in a pressure bomb initially filled at 15 °C to 25 °C with oxygen at 690 kPa, heating at a temperature between 98 °C and 102 °C, reading the pressure at stated intervals or recorded continuously until the breakpoint is reached. The time required for the sample to reach this point is the observed induction period at the temperature of test, from which the induction period at 100 °C may be calculated. The method is applicable for aviation and motor gasolines in their finished form only.

Technical details

Technical committee: ISO/TC 28 - Petroleum and related products, fuels and lubricants from natural or synthetic sources
SKU: ISO 7536:1994

Abstract

Overview

ISO 7536:1994 specifies the induction period method for determining the oxidation stability of gasoline. The test oxidizes a finished aviation or motor gasoline sample in a sealed pressure bomb filled with oxygen and heated; the time to a defined pressure breakpoint is recorded as the induction period. Results are reported as the induction period at 100 °C (IP100), calculated from the observed induction period at test temperature.

Key topics and requirements

Scope: Applies only to finished aviation and motor gasolines (not individual components).
Test principle: Oxidize 50 ml ±1 ml of sample in a pressure bomb filled with oxygen (commercial extra-dry, ≥99% purity) at 690 kPa, heat in a boiling water bath and monitor pressure until the breakpoint is reached.
Temperature: Bath maintained between 98 °C and 102 °C; thermometer and bath specifications in Annex B.
Breakpoint definition: Point in the pressure–time curve preceded by a pressure drop of exactly 14 kPa within 15 minutes and followed by a drop of not less than 14 kPa in 15 minutes.
Recording: Continuous pressure recording or readings at intervals ≤15 minutes.
Sample & apparatus: Glass sample container (50 ml), corrosion‑resistant steel pressure bomb (specification in Annex A), needle valve, pressure gauge (to at least 1 380 kPa) and a stainless steel burst‑disc assembly (rupture >1 530 kPa) for safety.
Result calculation: Convert observed induction period IPt (minutes) to IP100 using formulas:
- If test T > 100 °C: IP100 = IPt × [1 + 0.101 (T − 100)]
- If test T

Related standards

Other ISO standards

Overview

Key topics and requirements

Scope: Applies only to finished aviation and motor gasolines (not individual components).
Test principle: Oxidize 50 ml ±1 ml of sample in a pressure bomb filled with oxygen (commercial extra-dry, ≥99% purity) at 690 kPa, heat in a boiling water bath and monitor pressure until the breakpoint is reached.
Temperature: Bath maintained between 98 °C and 102 °C; thermometer and bath specifications in Annex B.
Breakpoint definition: Point in the pressure–time curve preceded by a pressure drop of exactly 14 kPa within 15 minutes and followed by a drop of not less than 14 kPa in 15 minutes.
Recording: Continuous pressure recording or readings at intervals ≤15 minutes.
Sample & apparatus: Glass sample container (50 ml), corrosion‑resistant steel pressure bomb (specification in Annex A), needle valve, pressure gauge (to at least 1 380 kPa) and a stainless steel burst‑disc assembly (rupture >1 530 kPa) for safety.
Result calculation: Convert observed induction period IPt (minutes) to IP100 using formulas:
- If test T > 100 °C: IP100 = IPt × [1 + 0.101 (T − 100)]
- If test T

ISO 7536:1994 PDF

Technical details

Abstract

Overview

Key topics and requirements

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