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和中峪墮徭忽翌議匯鐙猟�廝�
Material ideal for use in pressurised non-rigig airship envelopes would have the following properties:
1. High strength
2. High strength to weight ratio to mininise the weigh of envelope
3. Resistance to environmental degradation through temperature ,humidity and ultraviolet light.
4. High tear resistance to give damage tolerance
5. Low permeability to minimise helium loss.
6. Joining techiques that produce strong and reliable jionts,not subject to creep rupture
7. Low creep to ensure that the envelope shape is maintained through its life