1、 Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data that may improve this document should be sent to: Commander, Naval Sea Systems Command, ATTN: SEA 05B5, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to CommandStanda
2、rdsnavy.mil, with the subject line “Document Comment”. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. FSC 2040 INCH-POUND A-A-59488A 05 February 2010 SUPERSEDING A-A-59488 31 August
3、1999 COMMERCIAL ITEM DESCRIPTION DECKING, SYNTHETIC The General Services Administration has authorized the use of this commercial item description, for all federal agencies. 1. SCOPE. This Commercial Item Description (CID) describes the requirements of synthetic decking made from Ultra High Molecula
4、r Weight Polyethylene (UHMWPE). Synthetic decking is intended for use in the well decks of U.S. Navy amphibious ships that carry boats, landing craft, and other equipment. Adverse sea conditions and the ability to control boats and landing craft within the well area, when open to the sea, require th
5、at a durable and abrasion-resistant deck covering be used to provide some form of protection to both the ship and the service craft. 2. CLASSIFICATION. 2.1 Type Unless otherwise specified, synthetic decking shall be provided in a thickness of either 2.5 inches (63.5 millimeters) or 3.5 inches (88.9
6、millimeters) and in types and sizes as specified in the installation drawing. Panels shall be either the M-shaped cross section pattern (see 3.2, Figures 1 and 2), the Waffle-shaped (lightweight) cross section pattern (see 3.2, Figures 3 and 4), or a solid panel design. The M-shaped cross section de
7、cking shall be running in the fore to aft direction (see 3.2). Thinner, wider, or solid panels (not having the M-shaped or Waffle-shaped cross section) may be necessary to suit dimensional requirements or special conditions on the installation drawing. 3. SALIENT CHARACTERISTICS. 3.1 Material. Synth
8、etic decking shall be made using UHMWPE formulation. The UHMWPE material shall use a base virgin resin made in accordance with ASTM D4020 and have a nominal molecular weight of 3.1x106or greater. The use of additives and/or fillers with the virgin resin material shall be used to achieve the syntheti
9、c decking properties specified herein as long as the additives and/or fillers are evenly distributed throughout the panel to provide a 100 percent uniform mix and homogeneous-type formulation throughout the cross section. 3.1.1 Material properties. The synthetic decking material shall meet all of th
10、e following requirements specified over a normal operating temperature range of -20 to +125 F (-28.9 to +51.7 C). Unless otherwise specified within the documented test methods, all testing shall be conducted at +75 F (+23.9 C). A temperature variation of 9 F (5 C) shall be allowed for test purposes.
11、 The material property requirements are summarized in table I. 3.1.1.1 Thermal expansion. The synthetic decking formulation shall take into account the thermal expansion and contraction that may occur over the normal operating temperature range specified (see 3.1.1). The thermal effects on the overa
12、ll thickness, length, and width of the synthetic decking shall not be greater than a coefficient of thermal expansion of 8.4x10-5/F (1.5x10-4/C) when tested in accordance with ASTM D696. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59488A 3.1.
13、1.2 Flame spread. The test specimens shall be prepared and tested in accordance with ASTM E162 and shall not exceed a 25 Is (flame spread index) value. The test specimens shall be placed in the test fixture so that the high traction surface faces the flame source. The test specimens shall exhibit no
14、 dripping, puddling, or exfoliation during the test and shall not exhibit any burning or smoldering after the flame source has been removed. Surface coatings shall not be used to retard burning of the synthetic decking. 3.1.1.3 Smoke density. The test specimen shall be evaluated to determine the rel
15、ative amount of smoke produced by burning or decomposition in accordance with ASTM E662. The test specimens shall be placed in the test fixture so that the high traction surface faces the flame source. The smoke generated during the flaming and nonflaming modes shall not exceed 450 Dm (maximum speci
16、fic optional density). 3.1.1.4 Impact resistance. A test specimen shall be prepared and tested as described in ASTM D256, Method A (except that the Izod specimens shall be unnotched). The high traction surface is not to be included as part of the test specimens. These unnotched test specimens shall
17、be capable of absorbing an Izod impact condition of 45 inch-pounds/inch (202.5 Joules/meter). No breakage or cracking of the test specimen is permitted. 3.1.1.5 Coefficient of friction. The high-traction top surface of the synthetic decking (see 3.2.2) shall be manufactured so that the coefficient o
18、f friction value does not fall below 0.75 when tested in either the dry, wet, or oily surface conditions as determined from the WCM procedure specified in UL 410. 3.1.1.6 Water absorption. The synthetic decking material shall not absorb more than 1 percent of its original weight when immersed in wat
19、er as defined in ASTM D570. 3.1.1.7 Chemical resistance. The synthetic decking material shall not exhibit a weight increase of greater than 0.50 percent or a dimensional change of 0.10 percent when immersed in the following fluids and tested in accordance with ASTM D543. The synthetic decking shall
20、not experience any degradation or loss of material properties so that it fails to meet any of the other requirements specified within this document. a. Aqueous film-forming foam (AFFF) firefighting fluid made from six parts of foam concentrate and 94 parts of seawater in accordance with MIL-F-24385.
21、 Synthetically formulated seawater is acceptable for this test if natural seawater is not available. b. Hydraulic fluid in accordance with MIL-H-19457. c. JP-5 aviation fuel in accordance with MIL-DTL-5624. d. Lubricating oil in accordance with MIL-PRF-7808. e. Gasoline in accordance with ASTM D4814
22、. 3.1.1.8 Corrosion. The synthetic decking shall not have a corrosive effect on steel, galvanized steel, stainless steel, or aluminum when exposed to salt water or freshwater wash down conditions normally encountered in well deck service or when in contact with the chemical reagents specified in 3.1
23、.1.7. 3.1.1.9 Compression set. The synthetic decking shall not incur a permanent compressive strain of more than 10 percent when tested in accordance with ASTM D695. A load generating 500 lb/in2 (3.5 N/mm2) shall be used for the test. 3.1.1.10 Color. Unless otherwise specified in the Ordering Data (
24、see 7.2), the color of the synthetic decking shall be black. 3.1.1.11 Paintability. The high-traction surface of the synthetic decking shall be capable of being painted for marking and coding. White paint, color number 17875, or yellow paint, color number 13538, specified in Naval Ships Technical Ma
25、nual (NSTM) 631, shall be used to ensure compliance. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59488A Table I. Summary of synthetic decking material property requirements. Properties Units Requirements Test method F -20 to 125 N/A Operati
26、ng temperature (C) (-28.9 to 51.7) N/A /C 1.5x10-4ASTM D696 Coefficient of thermal expansion (between -30C & +100C) /F 8.4x10-5ASTM D696Flame spread Is 25 ASTM E162 Smoke density Dm 450 ASTM E662 inch-pound/inch 45 ASTM D256 Impact resistance (J/m) (202.5) Method A Coefficient of friction: Dry condi
27、tion 0.75 UL 410 Wetted with water condition 0.75 UL 410 Wetted with oil condition Dimensionless 0.75 UL 410 Water absorption Percent increase 1.0 ASTM D570 Chemical resistance: Firefighting fluid 0.50 wt/0.10 dim. ASTM D543 Hydraulic fluid 0.50 wt/0.10 dim. ASTM D543 Aviation fuel 0.50 wt/0.10 dim.
28、 ASTM D543 Lubricating oil 0.50 wt/0.10 dim. ASTM D543 Gasoline Percent increase in weight and dimensions 0.50 wt/0.10 dim. ASTM D543 Compression Percent 10.0 ASTM D695 Color N/A Black VisualPaintability N/A Pass NSTM 631 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without
29、 license from IHS-,-,-A-A-59488A 3.2 Construction. The formulated synthetic resin material shall be manufactured into 2.5-inch (63.5-millimeter) or 3.5-inch (88.9-millimeter) thick panels in types and sizes as specified on the applicable ship class installation drawings (see 2.1). Unless otherwise s
30、pecified in the Ordering Data (see 7.2), the synthetic decking shall be the M-shaped cross section pattern (see figures 1 and 2), the Waffle-shaped (lightweight) pattern (see figures 3 and 4), or a solid panel. The M-shaped design shall have the “M” running parallel to the length of the panel (figur
31、e 2). The Waffle-shaped design shall have tapered legs with a diameter of 3 inches (76.2 millimeters), spaced 6 inches (152.4 millimeters) on centers oriented throughout the length and width of the panel (figure 4). Both M-shaped panels and the Waffle-shaped (lightweight) panels shall have a high-tr
32、action surface on its top face (see 3.2.2). In no case shall the pattern decrease the remaining panel thickness to less than 1.25 inches (31.8 millimeters) for 2.5-inch (63.5-millimeter) thick panels or 1.75 inches (44.5 millimeters) for the 3.5-inch (88.9-millimeter) thick panels. Solid panels (not
33、 having the M-shaped or the Waffle-shaped design) may be used to suit dimensional requirements or special condition on the installation drawing. 1.50 inch (38.1mm) TYP2.5 inch(63.5mm)or 3.5 inch(88.9mm)1.25 inch (31.8mm)or 1.75 inch (44.5mm)0.12 inch (3.1mm)WIDTH SPECIFIEDHIGH TRACTION SURFACER0.50
34、inch (12.7mm) TYP.1.50 inch (38.1mm)0.69 inch (17.5mm)Figure 1. Typical synthetic decking M-shaped cross section (dimensions are nominal). Figure 2. Typical synthetic decking M-shaped panel (bottom face shown top face same as figure 1). 4 Provided by IHSNot for ResaleNo reproduction or networking pe
35、rmitted without license from IHS-,-,-A-A-59488A 3 inch dia. TYP(76.2mm)6 inch centers TYP(152.4 mm)REF. 7 degtaperVARIES2.5 inch(63.5mm)1.25 in (31.8mm)0.12 inch (3.1mm)WIDTH SPECIFIEDHIGHTRACTION SURFACER0.38 inch (9.7mm) TYP.R0.13 inch (3.3mm) TYP.i l h i ki ffl h d i ( i i i l)Figure 3. Typical s
36、ynthetic decking Waffle-shaped cross section (dimensions are nominal). Figure 4. Typical synthetic decking Waffle-shaped (lightweight) panel (bottom face shown top face same as figure 3). 3.2.1 Weight. The maximum weight for an M-shaped panel 12 inches by 12 inches (304.8 millimeters by 304.8 millim
37、eters), or 1 square foot area, of synthetic decking shall be 11.2 pounds (5.1 kilograms) for the 2.5-inch (63.5-millimeter) thick panel and 15.5 pounds (7.0 kilograms) for the 3.5-inch (88.9-millimeter) thick panel. The maximum weight for a Waffle-shaped (lightweight) panel 12 inches by 12 inches (3
38、04.8 millimeters by 304.8 millimeters), or 1 square foot area, of synthetic decking shall be 8.7 pounds (3.74 kilograms) for the 2.5-inch (63.5-millimeter) thick material. The maximum weight for a solid panel 12 inches by 12 inches (304.8 millimeters by 304.8 millimeters), or 1 square foot area, of
39、synthetic decking shall be 14.75 pounds (6.6 kilograms) for the 2.5-inch (63.5-millimeter) thick material. 3.2.2 High-traction surface. All synthetic decking panels shall incorporate a high-traction surface embedded to a minimum thickness of 0.12 inch (3.1 millimeters) into the top surface (see 3.2,
40、 figures 1 and 3). The non-skid surface shall be baked into the sheet to ensure it is a permanent part of the deck panel and not glued on, painted on, nor placed by any other cosmetic method and to ensure that the coefficient of friction requirements (see 3.1.1.5) are met and maintained throughout t
41、he full 0.12-inch (3.1-millimeter) thickness of the high-traction surface. 3.2.3 Structural integrity. The synthetic decking, including the high-traction surface, shall not delaminate, crack, splinter, peel, or spall when subjected to the testing included in this specification (see 3.1.1.4 for high-
42、traction surface exception). Minor surface scuffing that may occur during testing is acceptable, but shall not cause a loss of structural integrity of the synthetic decking nor any degradation of its high-traction surface. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted withou
43、t license from IHS-,-,-A-A-59488A 3.2.4 Production tolerances. The maximum production tolerances for the overall thickness and width of the synthetic decking shall not be greater than 0.12 inch (3.1 millimeters) of the dimensions specified on the applicable ship class installation drawing. The produ
44、ction length tolerance shall not be greater than 0.50 inch (12.7 millimeters) of the length specified on the applicable ship class installation drawing. 3.2.5 Attachment tolerances. When specified in the Ordering Data (see 7.2), synthetic decking shall be provided with fastener mounting holes arrang
45、ed in the hole patterns as shown on the applicable ship class installation drawing. Fastener mounting hole tolerances shall take into account the thermal expansion or contraction of the synthetic decking over the normal operating temperature range specified to ensure that panel buckling or binding p
46、roblems do not occur. 3.2.6 Flatness, waviness, and straightness tolerances. The flatness variation of the as-received panel shall not exceed 0.50 inch (12.7 millimeters) for every 12 inches (304.8 millimeters) of panel surface distance across the width or the length of the panel. The waviness varia
47、tions shall not exceed 0.50 inch (12.7 millimeters) at any point along the length of the synthetic decking. Flatness and waviness denote the maximum deviation of the top surface of the synthetic decking when resting on a flat horizontal surface. The straightness tolerance along the total length of t
48、he synthetic decking shall not exceed 0.50 inch (12.7 millimeters) at the maximum curvature point when measured against a flat vertical surface. 3.3 Installation requirements. The synthetic decking shall be capable of being cut or machined from its original length and width dimensions to any smaller
49、 dimension or shape and shall be capable of being drilled. The synthetic decking manufacturer shall be consulted regarding recommendations on the cutting tools, cutting speeds, safety procedures, and all other fabrication-related concerns that should be considered during the installation of the decking. 3.4 Maintenance. When subjected to the operational environment normally encountered in well deck operations, the synthetic dec
