Waterproof member, waterproof case, and electronic device

Abstract

A waterproof member achieves waterproof properties and sound transmission properties. The waterproof member includes a waterproof membrane having a storage modulus E′ of 2.5×106 Pa or more and 7.5×106 Pa or less as measured by a dynamic mechanical analysis test in tensile mode in a frequency range of 100 to 500 Hz and satisfies at least one selected from (i) and (ii) below: (i) an initial modulus measured by a tensile test is 30 MPa or more and 100 MPa or less; and (ii) a puncture modulus measured according to a puncture strength test specified in JIS Z 1707: 2019 is 9.0 MPa or more and 40 MPa or less, the puncture modulus being calculated by dividing a maximum stress applied just before a needle penetrates the waterproof membrane by an amount of displacement of the waterproof membrane in a puncture direction at the maximum stress.

Dependencies are inferred from the claim text.