MIL-STD 202 Accelerated Aging Testing
MIL-STD 202 accelerated aging testing helps determine the electrical and mechanical effects of exposure of a part to elevated ambient temperatures. This exposure occurs for a specific amount of time, while the part is operating. This test method is not intended for testing parts whose life is expressed in the number of operations.
Evidence of deterioration resulting from this test can at times be determined by visual examination. However, the effects may be more readily ascertained by measurements or tests prior to, during, or after exposure. These measurements may include surge current, total resistance, dielectric strength, insulation resistance, and capacitance.
Keystone Compliance is an accelerated aging testing lab, with significant MIL-STD-202 reliability experience. Our test engineers understand the requirements of MIL-202 accelerated aging compliance testing. The following is a summary of MIL-202 reliability certification requirements.
What is Apparatus is Best for Reliability Compliance Testing?
All testing should be done in an accelerated aging laboratory, equipped with a suitable test chamber. This chamber must be able to maintain the temperature and the tolerance that the parts will be subjected to. Chamber construction will minimize the influence of radiant heat on the parts being tested. Circulating liquid chambers, free-convection chambers, and circulating air chambers may be used providing the other requirements of the test are met.
Temperature measurements are made within a specified number of unobstructed inches from any part or group of like parts under test. The temperature measurement must also be made where the heat generated by the parts have the least effect on the recorded temperature. When specified, this test is done in still air, which is air with no circulation other than that created by the heat of the part being operated.
The employment of baffling devices and the coating of their surfaces with a heat-absorbing finish are permitted. When a test is conducted on parts that do not have the still-air requirement, there is no direct impact of the forced-air supply upon the parts. Keystone Compliance is one of the best accelerated aging labs in the country.
What is the Procedure for the Best Accelerated Aging Testing?
Specimens must be mounted by their normal mounting means. When groups of specimens are subjected to testing simultaneously, the mounting distance between specimens is as specified for the individual groups. When the distance is not specified, it must be sufficient to minimize the temperature of one specimen affecting the temperature of another. Specimens of different materials, that may poorly affect one another and alter the results of this test, should not be tested simultaneously.
Specified measurements should be made prior to, during, or after exposure, as specified. Frequency of measurements, and the portion of the duty cycle in which they are made, while the item is being tested, are as specified. Specimens will be subjected to one of the following test temperatures with accompanying tolerances, as specified:
| Temperature and tolerance 1/ | |
|---|---|
| °C | °F |
70 ±2 85 ±2 100 ±2 125 ±3 150 ±3 200 ±5 350 (± as specified) 500 (± as specified) | 158 ±3.6 185 ±3.6 212 ±3.6 257 ±5.4 302 ±5.4 392 ±9 662 (± as specified) 932 (± as specified) |
1/ For tests on resistors only, in a still-air environment, the maximum temperature tolerance are ±5°C (±9°F).
Specimens must be subjected to one of the following test conditions for the specified amount of time.
| Test Condition | Length of Test in Hours |
|---|---|
| A | 96 |
| B | 250 |
| C | 500 |
| D | 1,000 |
| E (Deleted from this method) | 1,500 |
| F | 2,000 |
| G | 3,000 |
| H | 5,000 |
| I | 10,000 |
| J | 30,000 |
| K | 50,000 |
What Reliability Testing Lab Provides the Best Reliability Testing?
Keystone Compliance has been recognized as one of the best reliability labs in the country. Our test engineers and reliability laboratory are equipped to provide accelerated aging certifications for commercial, military, and aerospace products. Contact us to learn why so many manufacturers rely on Keystone Compliance for all their compliance testing needs.
Looking for other MIL-STD-202 compliance tests? Click on a link below to learn more about the other test methods.
- MIL-STD-202 Test Method 101 Salt Atmosphere (Corrosion)
- MIL-STD-202 Test Method 103 Humidity (solid state)
- MIL-STD-202 Test Method 104 Immersion
- MIL-STD-202 Test Method 105 Barometric Pressure
- MIL-STD-202 Test Method 106 Moisture Resistance
- MIL-STD-202 Test Method 107 Thermal Shock
- MIL-STD-202 Test Method 108 Life (at elevated ambient temperature)
- MIL-STD-202 Test Method 109 Explosion
- MIL-STD-202 Test Method 110 Sand and Dust
- MIL-STD-202 Test Method 111 Flammability (external flame)
- MIL-STD-202 Test Method 112 Seal
- MIL-STD-202 Test Method 201 Vibration
- MIL-STD-202 Test Method 203 Random Drop
- MIL-STD-202 Test Method 204 Vibration, High Frequency
- MIL-STD-202 Test Method 206 Life (rotational)
- MIL-STD-202 Test Method 207 High-Impact Shock
- MIL-STD-202 Test Method 208 Solderability
- MIL-STD-202 Test Method 209 Radiographic Inspection
- MIL-STD-202 Test Method 210 Resistance to Soldering Heat
- MIL-STD-202 Test Method 211 Terminal Strength
- MIL-STD-202 Test Method 212 Acceleration
- MIL-STD-202 Test Method 213 Shock (specified pulse)
- MIL-STD-202 Test Method 214 Random Vibration
- MIL-STD-202 Test Method 215 Resistance to Solvents
- MIL-STD-202 Test Method 216 Resistance to Solder Wave Heat
- MIL-STD-202 Test Method 217 Particle Impact Noise Detection
- MIL-STD-202 Test Method 301 Dielectric Withstanding Voltage
- MIL-STD-202 Test Method 302 Insulation Resistance
- MIL-STD-202 Test Method 303 DC Resistance
- MIL-STD-202 Test Method 304 Resistance-Temperature Characteristic
- MIL-STD-202 Test Method 305 Capacitance
- MIL-STD-202 Test Method 306 Quality Factor
- MIL-STD-202 Test Method 307 Contact Resistance
- MIL-STD-202 Test Method 308 Current-Noise Test for Fixed Resistors
- MIL-STD-202 Test Method 309 Voltage Coefficient of Resistance Determination Procedure
- MIL-STD-202 Test Method 310 Contact-Chatter Monitoring
- MIL-STD-202 Test Method 311 Life, Low Level Switching
- MIL-STD-202 Test Method 312 Intermediate Current Switching