7.2 Dimensional Stability—The dimensional stability of the
exterior-profile extrusions shall be determined in accordance
with 11.3. Extrusions over 0.040 in. (1.02 mm) shall have a
maximum average shrinkage of 2.2 % for all sides measured,
with no single value exceeding 2.4 %. Extrusions of 0.040 in.
(1.02 mm) or less shall have a maximum average shrinkage of
3 %.