MIL-STD-304 conditioning

MIL-STD-304 is a commonly used accelerated-exposure technique to determine the effect of weathering and high humidity on adhesive specimens.66 In this procedure, bonded panels are exposed to alternating cold (-54°C) and heat and humidity (71°C, 95 percent RH) for 30 days. The effect of MIL-STD-304 conditioning on the joint strength of common structural adhesives is presented in Table 15.20. However, only relative comparisons can be made with this type of test it is not possible to extrapolate the results to actual service life. 

Chromic acid solution or paste-treated. Lap-shear 1 year storage at 66°C and MIL-STD-304 conditioning. MIL-STD-304 conditioning consists of 30-day cycles under the following conditions -54°C, 71°C dry heat, 71°C and 95% RH-heat and humidity. 

Table 10.8 Effect of MIL-STD-304 Conditioning (JAN cycle) on Strength of Bonded Aluminum Alloy 2024-T3 Joints ...

The effect of MIL-STD-304 conditioning on the joint strength of common structural adhesives is presented in Table 7.37. 

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