摘要:
Desired is a technology for improving the vibration-damping properties of a chloroprene rubber under low-temperature environment without deterioration of the mechanical properties, permanent compression set, and tension fatigue.Provided is a chloroprene rubber composition, comprising a chloroprene rubber at least containing a xanthogen-modified chloroprene rubber and/or a mercaptan-modified chloroprene rubber in an amount of 100 parts by mass, a carbon black having a number-average particle diameter of 70 nm to 600 nm and a DBP oil absorption, as determined by the Oil Absorption A method of JIS-K6221, of 15 ml/100 g to 60 ml/100 g in an amount of 15 to 150 parts by mass, and a plasticizer represented by the following Chemical Formula (1) in an amount of 3 to 30 parts by mass: [C.1] R1COO—(CH2)8—COOR2 (1) (wherein, R1 and R2 each represent an alkyl group having a carbon number of 1 to 7).
摘要:
To provide a chloroprene rubber composition with which a vulcanized rubber having further improved heat resistance without impairing mechanical properties, the compression set and the tension fatigue can be obtained, and a rubber member for an automobile, a hose, a rubber molded article and a rubber vibration insulator comprising the vulcanized rubber.A chloroprene rubber composition, which comprises 100 parts by mass of at least one chloroprene rubber selected from the group consisting of a xanthogen-modified chloroprene rubber and a mercaptan-modified chloroprene rubber, and from 15 to 200 parts by mass of carbon black having a number average particle size of from 70 nm to 600 nm and having a DBP oil absorption of from 15 ml/100 g to 60 ml/100 g by oil absorption method A of JIS K6221.
摘要:
A spark plug has a compact structure where a threaded portion of a metal shell has a size of M10 or M12 and the width between any two opposite side surfaces of a polygonal prism-shaped portion of the metal shell is no greater than 14 mm. In the spark plug, a thickness A of the polygonal prism-shaped portion of the metal shell, a thickness B of a crimped portion of the metal shell, and a thickness C of a buckled portion of the metal shell are subject to a dimensional relationship of A>B>C. Through specifying such a relationship, the crimped portion of the metal shell exerts a large constricting force on sealing members provided in a gap between the inner surface of the polygonal prism-shaped portion of the metal shell and the outer surface of an insulator, thereby securing high gas tightness of the spark plug.
摘要:
[Object] To regularize a potential distribution at a grid, prevent local corrosion, and lengthen product lifetime.[Solution Means] A storage battery grid includes: a frame bone 2 that includes a substantially rectangular shape; a lug portion 21 that is formed upward from an upper side 2a of the frame bone 2; one or more main vertical bone 3X that extend downward from the lug portion 21 in the frame bone 2; plural slanted bones 4 that extend obliquely from the upper side 2a toward a lower side 2b, at least the slanted bones branching from the main vertical bone 3X, which is a center, toward both sides. The slanted bones 4 are arranged at intervals in a direction in which the main vertical bone 3X extends, and at least part of plural spaces, which are defined by the main vertical bone 3X partially forming a side of the spaces, include a substantially quadrilateral shape.
摘要:
To provide a chloroprene rubber composition with which a vulcanized rubber having further improved heat resistance without impairing mechanical properties, the compression set and the tension fatigue can be obtained, and a rubber member for an automobile, a hose, a rubber molded article and a rubber vibration insulator comprising the vulcanized rubber.A chloroprene rubber composition, which comprises 100 parts by mass of at least one chloroprene rubber selected from the group consisting of a xanthogen-modified chloroprene rubber and a mercaptan-modified chloroprene rubber, and from 15 to 200 parts by mass of carbon black having a number average particle size of from 70 nm to 600 nm and having a DBP oil absorption of from 15 ml/100 g to 60 ml/100 g by oil absorption method A of JIS K6221.
摘要:
The use of the Pb—Sn alloy containing Ag and Se of the present invention as a connecting part for connecting internal components makes it possible to improve the resistance of straps, poles and cell connectors to general corrosion and grain boundary corrosion, inhibit the occurrence of the stress corrosion cracking and enhance the alloy strength, thus providing a lead acid battery having an excellent reliability.
摘要:
A semiconductor device includes a substrate having top and bottom surfaces, a semiconductor element mounted on the top surface of the substrate, and a resin package made of a resin and encapsulating the semiconductor element. The substrate includes at least one resin gate hole enabling the resin to be introduced from the bottom surface of the substrate via the resin gate hole when encapsulating the semiconductor element by the resin.