Equation 2 was solved for a film of initial length 𝑙 0 , initial width 𝑤 0 , and initial thickness ℎ 0 and shifted and scaled using a constant 𝛽 to account for mass loss due to leachable components (e.g., plasticizer) or other initial jumps in mass loss between the initial mass and the first time point to yield Equation 3. Thus, the trivial data point of zero mass loss at time zero was excluded from model fitting.