Yellowness Index: A measure of the color on the yellow scale.

Yield Point: In tensile testing, the yield point is the first point on the stress-strain curve at which an increase in strain occurs without an increase in stress.

Yield Strength: The stress at which a material exhibits a specified limiting deviation from the proportionality of stress to strain.

Young’s Modulus: The ratio of tensile stress to tensile strain below the proportional limit

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