MIL-DTL-26521L
i. If sample hose with a diameter other than 3 inch diameter is used then the allowable amount of
contaminate shall be adjusted as follows:
(mg/100ml results)(Hose sample ID adjusted)
= mg/100ml
3 inch diameter of specified sample
4.6.1.6 Liner fuel discoloration (see 3.5.1.7). The liner shall be tested for fuel discoloration in
accordance with ASTM D156 and ASTM D1500 and shall meet the requirement of 3.5.1.7.
4.6.1.7 Liner low temperature (see 3.5.1.8). The liner material shall be low temperature tested in
accordance with ASTM D380 and meet the requirement of 3.5.1.8. The following detail shall apply; the
liner material shall be subjected to -40°F ±2°F (-40°C ±1.1°C) for 5 hours.
4.6.2 Hose cover test methods.
4.6.2.1 Cover thickness (see 3.5.2.1). The cover thickness, when measured in accordance with
ASTM D380, shall meet the requirement of 3.5.2.1.
4.6.2.2 Cover tensile and elongation (see 3.5.2.2). The cover material, when tested in accordance
with ASTM D380 and ASTM D412, shall have a tensile strength of not less than 1000 psi (6.9 MPa) and
an elongation on not less than 200% and meet the requirements of 3.5.2.2.
4.6.2.3 Cover ozone resistance (see 3.5.2.3). The cover material shall not show signs of cracking
when subjected to a 24-hour conditioning period and an exposure of 72 ± .5 hours at 104° F (40°C) to an
atmosphere containing 100 ± 10 parts per hundred million of ozone in accordance with ASTM D1149.
The specimen shall be examined as specified in 3.5.2.3.
4.6.2.4 Cover volume change (see 3.5.2.4). The cover material when tested in accordance with
ASTM D380 and ASTM D471, shall not have more than 80% volume change after a 70 hour immersion in
ASTM D471 reference fuel B at 72 ±2° F (22°C ± 1.1°C) and shall meet the requirements of 3.5.2.4.
4.6.2.5 Cover low temperature resistance (see 3.5.2.5). The cover material, when tested in
accordance with ASTM D380, shall meet the requirement of 3.5.2. The following detail shall apply: the
cover shall be subjected to -40°F ±2°F (-40°C ± 1.1°C) for 5 hours.
4.6.2.6 Cover material abrasion resistance (see 3.5.2.6). The abrasion resistance shall be in
accordance with ISO 4649, method A and the results shall be within the limit specified in 3.5.2.6.
4.6.3 Hose assembly test methods.
determine compliance with the requirements of this specification with regard to cleanliness and
workmanship (see 3.9 and 3.10). Defects found during visual inspection of assemblies shall be identified,
categorized, and referenced in accordance with FED-STD-162.
dimensions shall be measured in accordance with ASTM D380 and meet the requirements of 3.6.1 and
4.6.3.3 Working pressure (see 3.6.6). The hose assembly shall be tested in accordance with
ASTM D380 and meet the requirements of 3.6.6).
14
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business