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Lieutenant General
No. That was referring to the materials for the exterior of an aircraft. Materials for interior have different (more challenging) requirements.
Also, this idea that China conducts development and prototype testing to send a political message is silly. When China wants to conduct tests to send a message, they use mature technologies.
Like the WU-14 HGV and when the J-20 first appear when Secretary of Defense Robert Gates came to China for a visit?