MIL-PRF-2765E
3.5 Identification. Unless otherwise specified (see 6.2), the synthetic rubber material shall be marked
with rows of constantly recurring yellow symbols identifying the product as oil resistant. Markings shall be as
specified in paragraphs 3.5.1 through 3.5.7. Material supplied under this specification shall be identified as
specified in paragraphs 3.5.1 through 3.5.7. Material shall be marked with a yellow color. Marking shall be done
with a permanent marking material.
3.5.1 Performance and legibility. Markings of rubber products shall be such as to not rub off or be
otherwise effaced by exposure to the elements, action of fluids, oils or environment to which the material is
resistant (see 3.5.6), and contact to normal handling, shipment, and storage. Legibility of the markings shall be
such as required for readability and temporary identification. Permanent identification is preferred if such does
not affect the function of the product. The size of the symbols or letters shall be commensurate with the size of
the product being marked.
3.5.2 Deleterious effect. Marking of rubber products shall be accomplished in a manner which shall not
adversely affect the acceptability and function of the finished product.
3.5.3 Exceptions. Only the part of the identification systems which applies to the individual
requirements of the item specification is intended to be used. Only one set of manufacturer's letters will be
specified on one item. More than one color dash may be used to indicate resistance to more than one
environment. When more than one dash is used on one item, the order in which the dashes appear should be the
same as the order shown in 3.5. On small molded products, where the cross sectional diameter is not sufficient or
functional surfaces do not permit marking in accordance with this standard, equivalent marking shall be placed on
the containers in which the item is packaged. Any exceptions to marking of the product itself is allowed only if
specified. The exceptions shall be specified in either the applicable drawing or the item specification, as
appropriate, or in both places.
3.5.4 Marking. Marking shall be accomplished by molding (either recess or in relief) or by external
application of a substance such as paint, cement or lacquer. The type marking and the marking material shall be
specified in the item specification so that critical surfaces are not damaged.
3.5.5 Symbols and letters. The symbol and letter designations published in the Rubber Manufacturer's
Association "Vendors Identification Guide for Molded and Extruded Goods" shall be used where applicable. The
size shall be consistent with the size of the part, but shall normally be in the range of 1.6 to 3.2 mm (1/16 to 1/8
inch). The color shall be yellow. When marking is accomplished by molding, the use of a colored paint, cement,
or lacquer is not required.
3.5.6 Colors and shape for environmental resistance. The colors indicated in 3.5 are to be applied as
dashes approximately 1.6mm (1/16 inch) wide by 6.4mm (1/4 inch) long and repeated at intervals of 254mm (10
inches) where size of product permits.
3.5.7 Dating. Unless otherwise specified, the date of manufacture shall indicate the quarter of the
calendar year and the year. For example, 2Q-97 indicates the date of manufacture was the second quarter of 1997.
3.6 Workmanship. The workmanship shall be such as to meet all applicable requirements of this
specification and the rubber shall be free of surface voids, tears, rips, cuts and free from all foreign matter that
may affect the use of the finished products.
3.7 Off-gassing. The gasket material shall meet the requirements in the Nuclear Powered Submarine
Atmosphere Control Manual, S9510-AB-ATM-010 Rev 2 of 30 July 1992, for a usage category of Limited (see
4.6 and 6.4).
3.8 Toxicity. The gasket material shall have no adverse effect on the health of personnel when used for
its intended purpose. The gasket material shall be assessed by the Navy Environmental Health Center
(NAVENVIRHLTHCEN) using the administrative Health Hazard Assessment (HHA). A flowchart for this process
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