ASTM D56 - 05(2010)

    Standard Test Method for Flash Point by Tag Closed Cup Tester

    Active Standard ASTM D56 | Developed by Subcommittee: D02.08

    Book of Standards Volume: 05.01


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    Significance and Use

    Flash point measures the tendency of the specimen to form a flammable mixture with air under controlled laboratory conditions. It is only one of a number of properties that shall be considered in assessing the overall flammability hazard of a material.

    Flash point is used in shipping and safety regulations to define flammable and combustible materials. One should consult the particular regulation involved for precise definitions of these classes.

    Flash point can indicate the possible presence of highly volatile and flammable materials in a relatively nonvolatile or nonflammable material. For example, an abnormally low flash point on a sample of kerosene can indicate gasoline contamination.

    1. Scope

    1.1 This test method covers the determination of the flash point, by tag manual and automated closed testers, of liquids with a viscosity below 5.5 mm2/s (cSt) at 40°C (104°F), or below 9.5 mm2/s (cSt) at 25°C (77°F), and a flash point below 93°C (200°F).

    1.1.1 For the closed-cup flash point of liquids with the following properties: a viscosity of 5.5 mm2/s (cSt) or more at 40°C (104°F); a viscosity of 9.5 mm2/s (cSt) or more at 25°C (77°F); a flash point of 93°C (200°F) or higher; a tendency to form a surface film under test conditions; or containing suspended solids, Test Method D93 can be used.

    1.1.2 For cut-back asphalts refer to Test Methods D1310 and D3143.

    Note 1—The U.S. Department of Transportation (RSTA) and U.S. Department of Labor (OSHA) have established that liquids with a flash point under 37.8°C (100°F) are flammable as determined by this test method for those liquids that have a viscosity less than 5.5 mm2/s (cSt) at 40°C (104°F) or 9.5 mm2/s (cSt) or less at 25°C (77°F), or do not contain suspended solids or do not have a tendency to form a surface film while under test. Other flash point classifications have been established by these departments for liquids using this test method.

    1.2 This test method can be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and cannot be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test method can be used as elements of fire risk assessment that takes into account all of the factors that are pertinent to an assessment of the fire hazard of a particular end use.

    1.3 Related standards are Test Methods D93, D1310, D3828, D3278, and D3941.

    1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

    1.5 WARNING Mercury has been designated by many regulatory agencies as a hazardous material that can cause central nervous system, kidney and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Material Safety Data Sheet (MSDS) for details and EPAs websitehttp://www.epa.gov/mercury/faq.htmfor additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law.

    1.6 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 8.2, 8.3, 9.5, 12.5, and refer to Material Safety Data Sheets.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D93 Test Methods for Flash Point by Pensky-Martens Closed Cup Tester

    D1310 Test Method for Flash Point and Fire Point of Liquids by Tag Open-Cup Apparatus

    D3143 Test Method for Flash Point of Cutback Asphalt with Tag Open-Cup Apparatus

    D3278 Test Methods for Flash Point of Liquids by Small Scale Closed-Cup Apparatus

    D3828 Test Methods for Flash Point by Small Scale Closed Cup Tester

    D3941 Test Method for Flash Point by the Equilibrium Method With a Closed-Cup Apparatus

    D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

    D6299 Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance

    D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants

    E1 Specification for ASTM Liquid-in-Glass Thermometers

    E502 Test Method for Selection and Use of ASTM Standards for the Determination of Flash Point of Chemicals by Closed Cup Methods


    ICS Code

    ICS Number Code 87.040 (Paints and varnishes)

    UNSPSC Code

    UNSPSC Code 41116301(Flash point testers)


    Referencing This Standard

    DOI: 10.1520/D0056-05R10

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D56-05(2010), Standard Test Method for Flash Point by Tag Closed Cup Tester, ASTM International, West Conshohocken, PA, 2010, www.astm.org

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