Collection of terms for miscellaneous rubber products

Rubber: Substance having the property (elasticity) of extending greatly with a little force and then recovering with the removal of an external force, requiring a cross-linking reaction.There are natural rubber, synthetic rubber and regenerated rubber which are produced by using latex collected from rubber trees, synthetic rubber which are chemically synthesized from petroleum, etc.Rubber that can be molded like plastic without crosslinking is called a thermoplastic elastomer.

O-ring: the o-ring is a ring seal with an O-shaped (circular) profile.Generally installed in the tank, and make it moderately compressed, can be used as oil, water, air, gas and other fluid seals to use.According to the use of different methods, there are fixed, sports and so on.

Flash: Thin rubber that comes out of the gap in the mold assembly.The flying margin of O-ring is specified in JIS B2408.

Compression permanent deformation: The permanent deformation rate of rubber under compression for a long time.Care must be taken not to be confused with cryogenic compression permanent deformation.

Elasticity: When the deforming load is removed, the material returns to its original shape.A property that cannot be recovered is called plasticity.

Compression margin: The O-ring is usually used for compression, so the depth of the mounting slot can be set to be slightly less than the thickness of the O-ring.This amount of compression is called the "compression margin ".

Parting line: the so-called "parting line" refers to the closing line texture of the mold.

Swelling: the selected O - ring is not suitable for oil resistance, drug resistance, O - ring suction liquid and become soft, expansion phenomenon.

Hardening: Sometimes there is a residual unreacted vulcanizing agent in the rubber, which is further vulcanized by heating and its hardness increases.This is called "hardening ". But over a long period of time, or with a sharp rise in temperature, rubber hardens rapidly and loses its softness, and the molecular bonds break and crack, or even break.(Depending on the type of rubber, it may also cause the molecular chain to be cut off and softened.) Ozone cracking: ozone is a strong oxidizing gas. Exposure to ozone will promote the rubber polymer chain to be cut off and cross-linked, and rubber will deteriorate (low molecular strength, hardening, and softness).As the deterioration continues, a "crack" called a "crack" will form on the surface.

Baffle ring: used in high pressure conditions to prevent O - ring overflow.The mounting position shall be on the opposite side of the pressure side.To apply pressure on both sides, install on both sides of the O-ring.In addition, when the low pressure is not easy to overflow, it can also prevent the tearing, torsion damage and other accidents of the O-ring, avoid damage and prolong the life of the O-ring.The materials are leather, nylon, hard rubber, metal, teflon, etc., but at present, most of the teflon retaining rings with good fusion properties are used.There are three types: ring, bevel, spiral.From the use of the ring is the best, but from the consideration of assembly, most use bevel cutting, spiral shape.

MSDS: MSDS is an abbreviation for Material Safety Data Sheet, also known as "Product Safety Data Sheet."Refers to the materials that record the names of the substances contained in the products, their dangerous and harmful information, precautions for use, impacts on the environment and other relevant information for the safe and proper use of chemical products.

RoHS directive: A regulation of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment EU (EU), which commenced on 1 July 2006.A directive to restrict the use of certain hazardous substances in electrical and electronic equipment.The restricted substances include Pb (lead), Cd (cadmium), Cr6+ (6-valent chromium), Hg (mercury), PBB (polybrominated biphenyl) and PBDE (polybrominated diphenyl ether).

Permeability: Gas molecules that can pass through intermolecular Spaces are called permeability. Conversely, those that do not pass through easily are called gas resistance.Rubber is elastic and has a smaller molecular structure than plastic, so it is generally more breathable than plastic.In the case of inorganic gas (N2, O2, He, etc.), butyl rubber and fluorine rubber are not easy to pass through, while silicone rubber is easy to pass through.

Fixing method: Generally speaking, there are three fixing methods: motion, cylinder and plane fixing.

Torsion phenomenon: O-ring torsion caused by improper installation of O-ring or improper opening and closing action of sliding surface valve, etc.Depending on the situation, it may even be cut off.

PAGE TOP abrasion resistance: Because rubber is very soft, it will be cut off after friction with other materials, reducing the volume.This property, which is not easily cut off, is called "abrasion resistance ".

Non-stick: O-rings will not stick to the opposite material even after long use.

Test result table: a table showing the physical properties and specifications of the O-ring material.

Coating: A fluororesin coating applied to the surface of the O-ring.Can improve the sliding and so on.

PAGE TOP diameter: Indicates the thickness of the O-ring.In addition, it is also represented by symbols W, PI, etc.The inner diameter represents the inner diameter of the O-ring.In addition, it is also represented by the symbol ID and so on.

JASO specification: Refers to the Automotive Technical Association specification.

JASO specification: Refers to the Automotive Technical Association specification.The tolerance of line diameter and inside diameter of JIS specification is very strict.

ISO specification: refers to the specification of the International Organization for Standardization.