4.1 To permit “line call-out” of a material’s physical and mechanical properties, this classification system establishes letter and number symbols for various performance levels of each property or characteristic.
4.2 Each “line call out” shall include:
- ASTM F104
- In parentheses, the letter “F” followed by 6 numerals describing the required basic characteristics per 8.1.
- Within the same parentheses, a dash “-” shall follow the basic characteristics, along with any supplemental characteristics per 8.2.
All six (6) numeric fields defining the basic characteristics must be occupied. If a particular characteristic is not required, a “0” must be used as a placeholder to indicate such.
4.3 The six (6) numeric fields used in the basic character- istics define (in order):
- Principal reinforcement
- Manufacturing method
- Thickness increase in IRM 903 oil
- Weight increase in IRM 903 oil
- Weight increase in water
ASTM F104 (F725400) describes a gasket material with only basic characteristics defined as follows: first numeral – 7 (non-asbestos fiber, tested as type 1); second numeral – 2 (beater process); third numeral – 5 (20 to 30 % compressibility per Test Method F36); forth numeral – 4 (15 to 30 % thickness increase after immersion in IRM 903 Oil per Test Methods F146); fifth numeral – 0 (no Requirement for weight increase in IRM 903 oil per Test Methods F146); sixth numeral – 0 (no
4.4 Supplemental characteristics may be added to line call out based on the needs of the application. The alpha numerics used to specify various supplemental characteristics are defined in 8.2.
ASTM F104 (F725400-B5E66M4) describes a gasket material with the same basic characteristics defined by Example 1, along with supplemental characteristics defined as follows: B5 (30 % creep relaxation per Test Methods F38); E66 (60 % weight change, and 15 to 35 % thickness change in ASTM Fuel B per Test Methods F146); M4 (no less than 6.895 MPa tensile strength per Test Methods F152).
4.5 The numeral “9” is used when the description of any characteristic (or test related thereto) is specified by some supplement to this classification system, such as notes on engineering drawings. This notation may be used to modify a test characteristic to a value not available in the tables; define gasket binder type; note use and type of a surface release agent; or note use and type of an adhesive system.
Using the same example and adding an L suffix requirement, ASTM F104 (F725400-B5E66M4L169), since the 9 needs to be defined on the engineering drawing, it is recommended to define the “As Specified” requirement immediately after the F104 line call out. In this case, for L169, the 1 defines the primary fiber as Aramid, the 6 indicates the secondary fiber is cellulose both per 8.2, and the 9 is defined immediately after the line call out as shown here:
ASTM F104 (F725400-B5E66M4L169); L169 (ACM Binder)
NOTE 1—While this “cell-type” format provides the means for close characterization and specification of each property and combinations of properties for a broad range of materials, it is subject to possible misapplications, since impossible property combinations can be coded if the user is not familiar with available commercial materials. Appendix X1 indicates properties, characteristics, and test methods that are normally considered applicable to each type of material.