US Patent 7654538 Gasket

A high-performance gasket (1) capable of coping with a reduction in size and developing a sealing property without producing a squeeze-out at the time of attachment and using a material having a hardness range of 30 to 80 degrees (JIS durometer type A), wherein the requirement of W1/W0<0.9 is satisfied where the bonding width of a base part (1a) is (W0) and the width thereof at a position half a height from the bonding part of the base part (1a) to the tip end of a main bead part (2) is (W1), the requirement of 1.15<H/W0<1.80 is satisfied where the height from the bonding part of the base part (1a) to the tip end of the main bead part (2) is (H), the requirement of L/W0>=3 is satisfied where the length of the non-bonded portion of the base part (1a) around the cross-section thereof excluding the bonded portion is (L), and the compressibility of the gasket when compressed is 13.5% or higher.