We have previously provided a detailed explanation of what Rubber Liner is and its common classifications. We understand that there are numerous types of rubber, each with its unique properties. So, how do we choose and use them in practical applications? DEF Rubber has the answer.

Considerations when choosing rubber liner:

When selecting suitable rubber for Rubber Liner, several factors should be considered:

1. Media Properties: This includes the physical and chemical properties of the medium, such as hardness, particle size and shape, acidity, and alkalinity.
2. Operating Temperature: This involves the regular working conditions, the highest and lowest operating temperatures, and temperature fluctuation patterns.
3. Usage Requirements: This includes the equipment’s efficiency, operational requirements, and safety regulations.
4. Wear and Erosion: Considering the impact of the medium and the equipment’s shape and structure on wear and erosion.
5. Cleaning Requirements: Considering post-maintenance, cleaning, replacement, and safety requirements, selecting materials that meet your needs and are cost-effective.

Rubber liner material selection tips:

In actual operations, when choosing the type, layers, and thickness of rubber, factors beyond those listed above might need consideration. For instance, the size and shape of the equipment or pipeline, working conditions, and environmental limitations. However, typically, Rubber Liner adopts a 1-2 layer structure, with each layer being 2-3mm thick. The total thickness generally does not exceed 8mm. Below are some common material selection tips provided by DEF Rubber:

1. Based on Different Corrosiveness of the Medium:
   • For highly corrosive media with minimal temperature fluctuations and no mechanical vibration in the equipment or pipeline, 1-2 layers of hard or semi-hard Rubber Sheets are used.
   • For equipment or pipelines with significant mechanical vibrations and temperature fluctuations, soft rubber is used as the base layer, covered by a corrosion-resistant semi-hard or soft synthetic rubber surface layer.
   • For weakly corrosive media with low temperatures, soft rubber can be used independently.
2. Based on Different Medium Components:
   • When the medium contains solid particles, wear resistance is crucial. Typically, a 2mm thick hard rubber layer is used as the base, covered with a suitable thickness of soft rubber as needed.
   • For gaseous media to prevent gas diffusion and leakage, hard rubber with excellent sealing performance is chosen. For highly corrosive gases like chlorine, 1-2 layers of hard rubber with a thickness of 4-6mm are necessary.
3. Based on Different Operating Temperatures:
   For equipment or pipelines operating at high temperatures (above 90°C), additional materials like ceramics, bricks, or carbon bricks can be added outside the Rubber Liner for isolation.
4. Based on Different Environmental Conditions:
   • For outdoor exposed Rubber Liner, weather-resistant rubber varieties like EPDM rubber or chlorosulfonated polyethylene rubber are used, avoiding hard rubber.
   • For equipment or pipelines at risk of freezing outdoors, a combination of soft synthetic rubber or hard rubber as the base, along with soft wear-resistant rubber, is applied.
5. For Equipment Prone to Deformation due to Temperature or Other Factors:
   A three-layer structure consisting of soft rubber, hard rubber, and soft rubber with a thickness of around 3mm for each layer is recommended. An additional layer of hard rubber can be added for strong corrosive media. For small equipment, semi-hard rubber can be used.
6. Material Selection for Vacuum Equipment:
   Cold bonding methods are generally not used for Rubber Liner in vacuum equipment. Instead, high-temperature vulcanization is employed to bond hard or semi-hard rubber. Rubber with strong adhesion to the substrate, such as chloroprene rubber, can also be chosen.
7. For Equipment Prone to Cutting by Sharp Objects or Mediums:
   Soft Rubber Liner is avoided.
8. For Rotating Equipment Parts such as Pumps, Ventilators, Centrifuges:
   1-2 layers of semi-hard rubber are used. For wear-resistant requirements, Rubber Liner with a combination of high-adhesion soft rubber and hard or soft composite rubber is applied. The thickness and number of layers depend on the intensity of wear.
9. For Equipment Subjected to High Impact, Such as Ship Rudders, Ball Mills, Pump Bodies:
   Soft rubber is used as the base, and hard rubber is applied as the surface layer.
10. For Equipment Requiring Mechanical Cutting, Such as Valve Cores, Cock Cocks, Centrifuge Shafts, High-Pressure Valves:
    Hard rubber is generally used.
11. For Efficient Equipment Operation, the Choice of Rubber Liner and Vulcanization Methods are Equally Important:
    For equipment or pipelines that can enter the vulcanization tank, tank vulcanization is the preferred method. For equipment unable to enter the tank but with a design pressure greater than 0.3MPa, vulcanization can be done using the equipment itself. For equipment with a design pressure less than 0.3MPa, atmospheric steam or hot water vulcanization can be applied. Large equipment generally uses naturally vulcanized or pre-vulcanized Rubber Sheets.

Classification of common rubber sheets:

The above points outline common methods for Rubber Liner selection. Additionally, here are some types of hard rubber, soft rubber, and other common Rubber Sheets for your reference:

1. Hard and Semi-Hard Rubber Include: Natural Rubber Sheet, butyl Rubber Sheet, nitrile Rubber Sheet.
2. Pre-vulcanized Rubber Includes: Butyl rubber, chlorobutyl rubber, bromobutyl rubber, polyisobutylene rubber, EPDM rubber, chloroprene Rubber Sheet, chlorosulfonated polyethylene rubber, PVC rubber, nitrile rubber.
3. Naturally Vulcanized Rubber Includes: Chloroprene rubber, bromobutyl rubber, chlorosulfonated polyethylene rubber.
4. Corrosion-Resistant Rubber Includes: Chlorosulfonated polyethylene rubber, chloroprene rubber, polysulfide rubber.

The above guidelines provide a comprehensive overview of Rubber Liner principles. If you have any further questions, we welcome you to engage in discussions with us. DEF Rubber specializes in providing Rubber Liner materials and is more than willing to explore further technical matters with you.