MIL-PRF-1149D
3.5 Identification markings. Unless otherwise specified (see 6.2), the
gasket material shall be marked as specified in this section, and shall
indicate the Military specification number, type, class, and cure date
(quarter and year). Sheet material marking shall be 1/2 inch high occurring
every 6 inches continuously across the sheet and recurring lengthwise every 4
inches on one side only.
3.5.1 Performance and legibility. Markings of rubber products shall
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 it 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 table III.
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 are 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 or extruding
(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 1/16 to 1/8 inch (1.6 to 3.2 mm). The color shall be white or
the same as the color used to indicate resistance to environment listed in
table III. When marking is accomplished by molding, the use of a colored
paint, cement, or lacquer is not required.
3.5.6 Colors for environmental resistance. The colors as specified in
table III are to be applied as dashes approximately 1/16 inch (1.6mm) wide by
1/4 inch (6.4mm) long and repeated at intervals of 10 inches (254mm) where
size of product permits.
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