(Only if elastic fiber present)Test in stretch direction only:Elastic fibre content:1-5%: measure growth after 1 hour. Pass or fail based on growth. Growth maximum 7%6-9%: measure growth and recovery after 60 minutes. Report both growth and recovery. Pass or fail based on growth. Growth maximum 5%Equal or >10%: measure recovery after 60 seconds. Pass or fail based on recovery. Recovery minimum 85%