Rupture Elongation L = 70 , T = 150 + 15 1029 according to Standard D41 .

As a result, provided are: a protein fiber having high stress and a favorable rupture elongation and a method for producing same.

The mold release film has a thickness of 16-175 μm, and a tensile rupture elongation of 600-3000 %, which is measured at a temperature of 110 °C, conforming to JIS K 7127.

This protein fiber contains silk fibroin, and the protein fiber has a stress of at least 450 MPa and a rupture elongation of at least 5%.

Elongation at rupture according to ISO 1798 (per cent

Elongation at rupture according to ISO 1798 (%

Elongation at rupture according to ISO 1798 (per cent)

The inventive membrane displays visibly improved fracture toughness (elongation at rupture/tension) with near unaltered swelling behaviour.

The inventive membrane has a substantially improved fracture toughness (elongation at rupture/tension) while its other properties remain almost unchanged.

Elongation at break not less than 100 per cent.

having an elongation at break of 15 %

elongation at break not less than 50 per cent.

an elongation at break of 1 % or more, and

Specifically, their elongation at break is higher than 6 %.

The exterior membrane (101) comprises a material with an ultimate elongation of more than 100%.

The stuffer strands resist elongation of the strap in response to tensile forces applied in the elongate direction of the strap, and have a maximum elongation at break of less than 7.5%.