what physical properties should we look for in materials used to make furniture,airplane body, electric plug cover, pyjamas?

what physical properties should we look for in materials used to make

1.	what physical properties should we look for in materials used to make furniture,airplane body, electric plug cover, pyjamas?
Answer» TION:furniture- durabilityairplane body- insulation to diffrent conditionselectric PLUG COVER- poor CONDUCTOR of electricitypyjama- made of cotton for air circulation