This motor introduced a series of innovations for the Chinese solid motor industry : first use of glass fibre wound cases, carbon / carbon nozzle throat insert material, contoured divergent nozzle, and non-destructive test of the motor grain.
22.
The factory performed complete in-house destructive tests of the wings to confirm that the structure met design loads ( the ratings are + 5.3 /-3.0, + 4.6 /-2.6, + 4.3 /-2.3 respectively for the aircraft at gross weight ).
23.
Some destructive tests may, however, be necessary; for example, the application of diluted hydrochloric acid will cause the carbonates odontolite and magnesite to effervesce and howlite to turn green, while a heated probe may give rise to the pungent smell so indicative of plastic.
24.
Non-destructive testing is preferred because most suspected diamonds are already cut into gemstones and set in jewelry, and if a destructive test ( which mostly relies on the relative fragility and softness of non-diamonds ) fails, it may damage the simulant an unacceptable outcome for most jewelry owners, as even if a stone is not a diamond, it may still be of value.
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