A-A-52175A
2.3 Physical properties. The physical properties of the impregnated pistons, such as, hardness, density, porosity, and surface roughness shall be suited to satisfy the performance requirements specified herein.
2.4 Performance requirements. The performance requirements of the impregnated piston shall be verified at assembly in its associated brake wheel cylinder and using silicon-based hydraulic brake fluid for use in hydraulic brake systems at ambient temperature ranging from
+55 degrees Celsius ( C) to -55 C, and fluid temperature ranging from +205 C to -55 C. The flash point of the impregnate shall be above 216 C.
2.4.1 Pressure resistance. The piston shall be capable of withstanding an internal fluid pressure of 20 685 kilopascals (kPa) for 30 seconds without doming and an internal fluid pressure of
34 475 kPa or cylinder burst pressure (whichever is lower), for 30 seconds without puncturing, penetrating, or cracking the piston.
2.4.2 Crush resistance. The piston shall withstand a radial crush pressure of 34 475 kPa
minimum applied at a rate of 900 kilograms (kg) per minute until failure or maximum crush load is observed. Crush resistance requirement is waived for insert type-shoe loaded sintered iron
pistons.
2.4.3 Stroking (endurance). The piston shall show no signs of wear (less than 0.026 mm) and no scoring of the piston or cylinder wall after being subjected to 70 000 strokes under a pressure of
6 890 kPa at 120 C.
2.4.4 Corrosion resistance. The piston shall show no evidence of iron deposits after being immersed in the brake fluid solution for 14 days at 46 C and 95 percent relative humidity.
3. REGULATORY REQUIREMENTS.
3.1 Recovered materials. The offeror/contractor is encouraged to use recovered material to the maximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR).
4. QUALITY ASSURANCE PROVISIONS.
4.1 Responsibility for inspection. The contractor is responsible for the performance of all inspections (examinations and tests).
4.2 Product conformance. The products provided shall meet the salient characteristics of this commercial item description, conform to the producer's own drawings, specifications, standards, and quality assurance practices, and be the same product offered for sale in the commercial market. The government reserves the right to require proof of such conformance.
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