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 Liquid Silicone Rubber 

LSR has excellent flow properties and is especially suitable for efficient injection 
molding processes, which can greatly improve production efficiency and reduce waste.
 

What is Liquid Silicone Rubber?

Liquid silicone rubber (LSR) is a low-viscosity (with some fluidity before vulcanization), two-component platinum catalytic silicone rubber elastomer. A component is a functional polymer containing vinyl and platinum catalyst, and B component is a cross-linking agent and inhibitor containing hydride. It is stored in two independent barrels respectively and pumped to a static mixer with a certain proportion of mixture in the external after accurate measurement. It is vulcanized by a liquid injection molding process without the need for secondary vulcanization.
Synonyms: LSR, liquid silicone, Liquid silicon rubber, silicone liquid rubber, silicone rubber liquid, lsr liquid silicone rubber, addition silicone rubber, two part liquid silicone rubber, silicone liquid

Heat curing silicone rubber

Liquid silicone rubbers are also heat-cured rubbers, and their viscosity and crosslinking properties make them materials with special processing advantages. Compared with solid silicone rubber (HTV), it is characterized by low viscosity. Liquid silicone rubber is a two-component blend with pumpability. Liquid silicone rubber is cured by addition crosslinking, and its A component contains a platinum catalyst and the B component contains a SiH functional polysiloxane that acts as a crosslinking agent. Unlike peroxide crosslinking, liquid silicone rubber does not produce any crosslinker by-products when cured.
Yongrui team has 12 years of rich experience in producing liquid silicone. We can manufacture LSR material according to the customer's viscosity, color, and density requirements. Welcome to contact us.

Liquid Silicone Rubber Properties

Liquid silicone rubber is based on a silicon-oxygen bond (-Si-O-Si-) as the main chain structure. The Si-O bond has much higher energy than the C-C bond, and its unique molecular structure makes liquid silicone rubber more excellent than ordinary rubber after vulcanization.
 

High and low-temperature resistance: The main chain of liquid silicone rubber is -Si-O-, the chemical bonds of molecules will not be broken or decomposed under high temperature or high radiation, and it has better thermal stability than other silicone materials so that liquid silicone rubber can withstand more wide temperature range. Even at -50℃-300℃, the chemical properties and physical and mechanical properties change very little with temperature.

Weather resistance: In harsh environments (such as high temperatures, and high radiation), it is not easy to be decomposed by ultraviolet light or ozone, not easy to be oxidized, and has better radiation resistance and weather resistance than other materials.
Good electrical insulation properties: dielectric strength ≥ 20kV/mm, electrical insulation properties vary little by temperature and frequency.
Excellent biocompatibility: Polysiloxane compounds are one of the most inactive chemicals. They are physiologically inert, non-toxic, odorless, non-rejecting when in contact with human tissues, not easy to be infected with, and have good biocompatibility and anticoagulant properties. Due to these properties, liquid silicone rubber is widely used in medical products for external use (catheters, cannulas, pain relief pumps, etc.) and short-term indwelling in vivo (intravenous catheters, urinary catheters, math museums, chest drainage tubes, nasal cannulae, etc.).
High optical transparency：The light transmittance is as high as 95%, and it is resistant to UV and blue light, which solves the problem of lens yellowing.
Excellent self-adhesive：No primer pretreatment is required to achieve good adhesion to PC, PA, PBT, PPSU, PEEK, TPU, PET, PI substrates, or metals.

  • Liquid silicone rubber performance data
    More+
  • Liquid silicone rubber for baby care series
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    Test items Appearance Viscosity
       (Pa.s)    		 Hardness Density
    (g/cm3)    		 Resilience
       （%）    		 Tensile strength
    (Mpa)    		 Elongation
    at break    		 Tear strength
         (KN/m)    		 Tensile set
           (%)    		 Line shrinkage
    YR6250-10A/B Transparent 500 10 1.07 20 1.5 750 5 4.3 2.5
    YR6250-15A/B Transparent 600 15 1.08 45 3.5 850 9.0 3.4 2.7
    YR6250-18A/B Transparent 600 18 1.08 50 5 800 12 3.4 2.5
    YR6250-20A/B Transparent 800 20 1.09 50 6.5 800 15 2.6 2.4
    YR6250-30A/B Transparent 1000 30 1.1 55 7 700 15 2.6 2.4
    YR6250-40A/B Transparent 1200 40 1.11 55 7.5 550 25 2.6 2.5
    YR6250-50A/B Transparent 1200 50 1.12 65 9 550 30 1.7 2.6
    YR6250-60A/B Transparent 1500 60 1.12 60 9.5 500 35 1.7 2.6
    YR6250-70A/B Transparent 2000 70 1.13 55 9.5 400 30 0.8 2.5
    YR6250-71A/B Transparent 2500 71 1.13 55 9 350 25 0.8 2.5
  • Self-adhesive liquid silicone rubber series
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    Item number Appearance Viscosity
       (Pa.s)    		 Hardness Density
    (g/cm3)    		 Resilience
         (%)     		 Tensile strength
             (Mpa)    		 Elongation at break Tear strength
        (KN/m)    		 Tensile set (%) Line shrinkage
    YH6150-60SA/B Transparent 1000 60 1.12 65 8 400 20 1.7 2.3
    YH6150-70SA/B Transparent 3000 66 1.13 65 12 450 35 1.7 2.5
    YH6150-70SA/B Transparent 2500 65 1.13 65 8.5 300 35 0.8 2.5
     
  • Medical grade liquid silicone rubber series
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    Item number Appearance Viscosity Hardness Density
    (g/cm³)    		  Resilience
       (%)       		 Tensile strength
    (Mpa)    		 Elongation at break Tear strength
      (KN/m)    		 Tensile set   (%) Line shrinkage
    YR6250-40MAB Transparent 1000 40 1.11 55 9 750 25 1.7 2.6
    YR6250-49MAB Transparent 1200 49 1.12 60 10 700 30 1.7 2.6
    YR6250-57MAB Transparent 2000 57 1.12 60 11 600 40 1.7 2.5
    YR6250-65MAB Transparent 2000 63 1.13 55 11 550 40 1.7 2.5
  • Optical liquid silicone rubber series
    More+
    Item number Appearance Viscosity Hardness Density
    (g/cm³)    		 Resilience
       (%)       		 Tensile strength
    (Mpa)    		 Elongation at break Tear strength
      (KN/m)    		 Tensile set (%) Line shrinkage
    YR6250-40OAB Transparent 13 40 0.99 20 3 180 7 ≤3.2 ≤2.5
    YR6250-50OAB Transparent 14 50 0.99 35 4 150 9 ≤3.2 ≤2.4
    YR6250-60OAB Transparent 16 60 1.02 45 5.5 130 10 ≤3.2 ≤2.4
    YR6250-70OAB Transparent 18 70 1.05 55 7 100 10 ≤3.2 ≤2.5

Liquid silicone rubber application

For its unique properties, liquid silicone rubber is widely used in the production and design of automobiles, health products, kitchen utensils, mother and baby products, medical supplies, diving supplies, electrical insulation, and seals.
 

 

Medical using LSR

Health care using LSR

Automotive using LSR

Liquid silicone rubber can provide an ideal material for medical applications due to its unique biocompatibility. This high-purity material offers numerous advantages, including excellent chemical and physical stability, weather resistance and aging resistance. Application products include medical throat tubes, medical silicone tubes, ventilator bellows, masks, etc.
Liquid silicone rubber provides the perfect component material for automotive manufacturing. The robust operation of the production process and the perfect final product are guaranteed. Applications include waterproof rings, spark plugs, wire harness sealing plugs, waterproof connectors, electronic circuit seals, etc.
Automotive using LSR

Baby Care using LSR

Baby Care using LSR
Common products of LSR for baby care include pacifiers, feeding bottles, feeding bottle brushes, bath brushes, soft spoons, teethers, etc. Because of their ease of production and fine processing, they have good economic and social benefits and are well received. It has received extensive attention in the field of baby products. Moreover, it is a food-grade material, has passed FDA certification, has no odor, is non-toxic, does not contain BPA, is soft and tough, and is especially suitable for the production of various baby products and toys. Its composition is confirmed, and it is a clean, plasticizer-free, flexible material that can meet the requirements of any application where reliability and comfort are critical.

Electronic products using LSR

LSR is a high-performance material. Commonly used products in electronic products include SIM card trays, earphones, waterproof sealing rings for electronic products, waterproof rings for power buttons, and TYPE-C interfaces. It has excellent chemical and thermal resistance, excellent mechanical properties, and an excellent low-compression set. Especially at low temperatures, it exhibits extremely high flexibility and softness, and its performance changes very little or almost nothing in a wide temperature range, which makes it stand out from many flexible polymer materials. Through secondary overmolding with other hard plastics or metals, the parts can have excellent waterproof sealing functions.
Electronic products using LSR

Consumer products using LSR

Consumer products using LSR
Liquid silicone rubber is also widely used in everyday consumer products. It is mainly reflected in the characteristics of softness and skin-friendly, easy to clean, high precision, and not easy to chemically react with other bathroom substances. For example, the liquid silicone rubber shower head that we use every day in our lives is made of liquid silicone, which has strong toughness and is not easy to be damaged. The molecular structure of liquid silicone rubber remains unchanged at high temperatures of 300 degrees and -40 degrees. It is very suitable for anti-scalding and heat-insulating kitchen materials. Liquid silicone rubber also has high-level kinetic energy molecules, which can effectively decompose the kinetic energy and force from the outside, making it an ideal material to replace plastics.

Benefits of Liquid Silicone Rubber

Clean and stable: Liquid silicone rubber is free of solvents and moisture, and does not pollute the environment. The compound is supplied in two components, both filtered and exhausted. The two-component mixture can be stored at room temperature for 24 hours after class and can be stored for 2 days after cooling.

simple process: the two components are mixed in a certain proportion, and the batching process is very simple. The vulcanization speed is fast. For products made with porous molds (about 7g of rubber material per hole), the vulcanization cycle is 20-30 seconds, which is one-tenth of that of ordinary rubber.

Better fluidity: Because it is in a liquid state, its fluidity is very good, and the cavity can be filled without a strong injection pressure, so it is suitable for the molding of various thin-walled, narrow-groove and long-tube products; easy to manufacture, Improve productivity.

Lower molding temperature: The molding temperature of solid silicone rubber is usually 170-200 degrees, while the molding temperature of liquid silicone rubber is 100-130 degrees, which can be quickly cured to shorten the molding cycle. Although solid silica gel is also catalyzed by platinum, the molding temperature is limited, so the liquid silicone rubber material is the best choice for silicone-coated silicone rubber and silicone rubber composite products.

Shorter cure times: Liquid silicone rubber cures in seconds. The curing time is only one-tenth of that of solid silicone products, and no secondary vulcanization is required. Therefore, the production cycle is greatly shortened and the production efficiency is greatly improved;

Energy saving: Because the liquid silicone rubber adopts a simple injection molding process and the vulcanization equipment is an injection machine, it can save 75% of energy consumption.

The high degree of automation and low cost: only one worker is needed for the processing and production of liquid silicone rubber. For example, the cost can be reduced by 42% based on 6g of finished products.

Less fixed investment: Liquid silicone rubber uses light machinery instead of heavy machinery. The plant area can be greatly reduced, and the investment cost is lower.

Why choose Yongrui's liquid silicone rubber as the material for your parts?

 
 

  • Professional

    12 years experience manufacurer liquid silicone rubber material

  • OEM/ODM

    All kinds of viscosity, hardness, and color can be produced
    according to customer requirements.

  • Quality certificate

    Passed ISO9001, FDA, and LFGB certification. This means that we guarantee to provide you with high-quality products.

  • Mass Production​​​​​​​

    Yongrui uses advanced machinery and equipment to produce and provide medical liquid silicone rubber with stable performance and quality assurance.
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