Methylvinyl silicone rubbers with hardness of 30, 40, 50 (Shore
A) used in this study have thickness of 0.5 mm and were purchased
from For long Silicone Rubber Products Co. Ltd (China). Reagent
grade acetic acid, sulfuric acid (98%), and hydrofluoric acid (48%)
were received from Sinopharm Chemical Reagent Co. Ltd (China).
Water was deionized through a Milli-Q system (Barnsted Nanopore,
resistivity ¼ 18.0 MU cm1).
Prior to degradation tests,
silicone
rubbers were flushed with de-ionized water to clean the
surface.