Mechanical Characteristics

An explanation of the meaning behind and the measurement method for the main physical properties measured.

Tensile Strength and Tensile Elongation

Unit	MPa/%
Purpose / Details	To express the maximum force the film can withstand when it is pulled (tensile strength) and the amount it stretches (tensile elongation).
Measurement Method / Standards	In accordance with JIS-C-2151 and ASTM-D-882.
Specific Measurement Method	Using a tensile testing machine, the film is pulled at a speed of 200 mm/min, calculating the strength when the film sample tears (a value obtained by dividing the tensile load by the cross-sectional area of the sample) and the amount of elongation. The tensile elongation is calculated using the following formula. Tensile elongation (%) = 100 × (L - Lo) / Lo Lo: Sample length before test, L: Sample length at break

F-5 Strength

Unit	MPa
Purpose / Details	To express the amount of force applied for the film to stretch 5%. This is close to the yield point, and so elongating past this may cause deformation.
Measurement Method / Standards	In accordance with ASTM-D-882.
Specific Measurement Method	The testing equipment and samples are the same as that for tensile strength and elongation. The F-5 strength is expressed as a value (MPa) obtained by dividing the load when a sample is elongated by 5% with the cross-sectional area of the sample.

Young's Modulus (Tensile Modulus)

Unit	MPa
Purpose / Details	To express the stiffness of the film. The larger the value, the stiffer the film is. This value is obtained from the maximum elasticity immediately before the film undergoes plastic deformation in the tensile test.
Measurement Method / Standards	In accordance with ASTM-D-882.
Specific Measurement Method	The testing equipment and samples are the same as that for tensile strength and elongation. Young's modulus is obtained from the maximum elasticity (primary expression of the tangent of the maximum slope of the SS curve) immediately before the sample is deformed.