MIL-DTL-26521L
FIGURE 2. Hose section.
3.5.1 Liner
3.5.1.1 Liner material. The liner material shall be a fuel resistant synthetic rubber capable of meeting
all the requirements of this specification. The liners (inner tube) material shall be continuous, either
calendered or extruded. The liner shall be a smooth, continuous, free of pitting, blisters, depressions,
grooves, holes, cuts, charge marks, slits, porosity, and foreign material. Spiral tube laps and die marks
are acceptable. Cuts shall not exceed .03 inch (0.8 mm) in depth.
3.5.1.2 Liner thickness. The liner thickness shall be not less than .06 inch (15 mm) when measured
in accordance with 4.6.1.1.
3.5.1.3 Liner tensile strength and elongation. The liner material shall have a tensile strength of not
less than 1000 psi (6.9 Mpa) and an elongation of not less than 200% when tested in accordance with
3.5.1.4 Liner volume change. The liner material shall not have more than 30% increase in volume
when tested in accordance with 4.6.1.3.
3.5.1.5 Liner extractable material. The liner shall not have more than 6% of extractable matter when
tested in accordance with 4.6.1.4.
3.5.1.6 Liner fuel contamination. The hose shall not contaminate fuel with more than 20 mg per
100 ml of extractable material when tested in accordance with 4.6.1.5.
3.5.1.7 Liner fuel discoloration. The color of the fuel following the fuel contamination test shall not be
less than +15 saybolt when tested in accordance with 4.6.1.6.
3.5.1.8 Liner low temperature. The liner material shall not crack tested in accordance with 4.6.1.7.
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