ASTM D381 standard test method for gum content in fuels by jet evaporation
1. Scope
1.1 This test method covers the determination of the existent gum content of aviation fuels, and the gum content of motor gasolines or other volatile distillates in their finished form, (including those containing alcohol and ether type oxygenates and deposit control additives) at the time of test.
1.2 Provisions are made for the determination of the heptane insoluble portion of the residue of non-aviation fuels.
1.3 The values stated in SI units are to be regarded as the standard. The accepted SI unit of pressure is the Pascal (Pa); the accepted SI unit for temperature is degrees Celsius.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see 6.4, 7.4, and 9.1.
2. Referenced Documents
2.1 ASTM Standards:
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
E 1 Specification for ASTM Liquid-in-Glass Thermometers
E 29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
2.2 Energy Institute Standard:
IP Standard Methods for Analysis and Testing of Petroleum Products
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 existent gum - the evaporation residue of aviation fuels, without any further treatment.
3.2 For non-aviation fuels, the following definitions apply.
3.3 solvent washed gum content - the residue remaining when the evaporation residue (see 3.4) has been washed with heptane and the washings discarded.
3.3.1 Discussion - For motor gasoline or non-aviation gasoline, solvent washed gum content was previously referred to as existent gum.
3.4 unwashed gum content - the evaporation residue of the product or component under test, without any further treatment.
