Rubber seal

3.1 Overview
  Function of sealing material is filled with complex and unfavorable configuration space construction to the seal. There are three main types of sealing materials:

  1) The vulcanized rubber gasket or seal type;
  2) non-curing type of sealing tape;
  3) no fixed shape of the liquid paste or putty-like sealant.
  3.2 Classification of sealant
  And types of sealant are many types. In order to meet the same requirements, you can use several different base sealant material; the same base material but also to create different properties and different uses of the sealant. Sealant from both producers and users to consider a variety of sealant classifications. Generally classified according to the following four methods.
  3.2.1 Classification according to sealant base
  3.2.1.1 rubber
  Such sealant to the rubber-based material. Thiokol rubber are commonly used, silicone rubber, polyurethane rubber, chloroprene rubber and butyl rubber.
  3.2.1.2 Resin
  Such sealants with resin-based material. Commonly used with epoxy resin, unsaturated polyester resins, phenolic resins, acrylic acid resin, polyvinyl chloride resin.
  3.2.1.3 Oil-based model
  Such sealant to oil-based material. Commonly used vegetable oils such as linseed oil variety, castor oil and tung oil, and animal oils (such as fish oil), etc.
  3.2.2 Classification according to sealant curing methods
  Sealant use of such moisture in the air for curing. It includes single-component polyurethane, silicon rubber and polysulfide rubber. The polymer-based compound containing active genes, with the air in the water can react to form crosslinks, the sealant cured into a network structure. Atmospheric moisture as a curing reaction catalyst.

  3.2.2.2 chemical curing-type sealant
  Two-component polyurethane, silicone rubber, polysulfide rubber, neoprene rubber and epoxy sealants fall into this category, generally at room temperature to complete curing. Some single-component CSM and neoprene sealant and PVC sol paste sealant (such as automotive plastic welding) is required to be added to complete the chemical reaction under the conditions of vulcanization.
  3.2.2.3 Thermal transition type sealant
  With PVC resin and plasticizer dispersed with rubber and asphalt sealant is used in two different types of thermal shift system. Plasticized vinyl resin is liquid at room temperature, body suspension, into a solid by heating and hardening; and rubber - asphalt and sealant, compared with the hot-melt.
  3.2.2.4 oxidation hardening sealant
  Dry the surface of the glass with caulking or sealant is installed this type, mainly in dry and semi-vegetable oil as a substrate. The oil can be refined in the class aggregation, blowing or chemical modification. With cobalt naphthenate as drier to accelerate the internal surface is not dry and harden; can lead naphthenate are hardened surface and interior; and the internal hardening manganese naphthenate more effective.
  3.2.2.5 solidified sealant solvent evaporation
  This is, after evaporation of the solvent-free polymer-based adhesive sealant material. This category mainly butyl sealant intersection, high molecular weight polyisobutylene, a certain degree of polymerization of acrylic, chlorosulfonated polyethylene and neoprene rubber sealant.
  3.2.2.6 non-drying to a permanent plastic sealant
  Such sealants typically include polybutylene, medium molecular weight polyisobutylene, high viscosity adhesive non-oxidizing material such as styrene-based oil, non-drying vegetable oil, blown semi-dry oil-based or butyl rubber sealant material.
wire mesh cable trays, cable tray fittings, metal cable trays
  3.2.3 Classification according to sealant forms
  3.2.3.1 paste sealant
  Such sealants are low-level sealant, usually three main materials: oil and resin; polybutylene; asphalt. Commonly used in small sealed glass windows fixed, the largest of its joint movement and deformation of +5% or -5%, use is usually valid for 2 years.
  3.2.3.2 Liquid elastomer sealant
  Such sealants include elastic state can be formed by curing the liquid polymer. They have the ability to withstand repeated deformation of the joints. Liquid elastomer sealant life is generally 15 to 20 years. Such sealant with high adhesive strength and shear strength, room temperature, with good flexibility. The disadvantage is the high price, usually need at the end of glue, two-component sealant on-site mixing is not convenient, when the curing temperature and humidity sensitive, etc.
  3.2.3.3 Hot melt sealant
  Also known as hot-melt sealant sealant type of construction, refers to the elastomer blends with thermoplastic resin-based sealant material.
  Hot melt sealants can be formulated into liquid elastic sealant performance close to, but it is more than the liquid elastomer sealant is not required to join the superior curing agent.
  3.2.3.4 Liquid Sealant
  Such sealant is mainly used for surface combined with mechanical seal to replace the solid sealing material (paper, asbestos, cork, and vulcanized rubber) to prevent mechanical internal fluid leakage from the joint surface, so the liquid is also known as liquid gasket sealant.
  3.2.4 After the sealant performance by category
  3.2.4.1 curable sealant
  Such sealants can be divided into rigid and flexible types. Rigid sealant cured or solidified to form solid, with little flexibility; flexible sealant after curing flexible and soft.
  Characterized by rigid sealant can not be bent, usually joint immovable.
  After the flexible sealant to maintain flexibility by curing.
  3.2.4.2 non-cured sealant
  Such sealant is soft coagulation sealant remains non-drying after construction (tackifier constantly migrating to the surface) state. This paste is usually plastic, scraper or brush can be applied to the joints, it can be different with different viscosity and performance of sealant use.
  3.3 Common types of sealant
  In the previous sealant category lists a variety of methods, which is the most widely used type of curing the sealant into two major categories of non-sulfide type. During the curing-type sealant is the most widely used type of room temperature curing, heat curing type with less. Non-curing type sealant liquid sealant and putty. In addition, in common with anaerobic adhesive.
  3.4 liquid sealant selection and construction process
  Sealant selection should be based on conditions of use, sealing materials and sealing surface condition, type and characteristics of the sealed medium and the coating process and other requirements into account. Under normal circumstances when a larger force, and by the impact and alternating force should be used in high-strength sealant; when the temperature becomes large, the toughness of a good sealant should be used.
  3.4.1 The construction method of liquid sealant
  Liquid sealant glue construction method according to the state selection. Scratch sealing paste used scraper or injection gun injection construction; liquid sealant using brushes brush or spray; membrane sealant method of construction with the Stones.
  3.5 Domestic sealant
  3.5.1 Thiokol RTV sealant material for the multi-component, room temperature vulcanized into the elastomer, the dry adhesive type sealant, commonly used sealant with XM series.
  3.5.2 RTV silicone rubber sealant
  Silicone rubber sealants are a variety of special properties, such as high temperature, low temperature performance, good electrical insulation properties.

  3.5.3 Anaerobic
  3.5.4 Other curing type sealant
  3.5.5 Non-curing-type sealant
  Most non-curing type sealant is non-drying and semi-nature, which was also known as non-curing putty-like putty type. Such temperature-sensitive adhesive on a small range in temperature sealant deformation, no cracking, no crust, and the long-term storage is good, but lower mechanical properties, suitable for fastening connection or removable parts of the sealing joints, sealing and filling the trench structure blocking the larger gap in the liquid seal in the dominant, widely used in removable parts of the seal.