Liquid Silicone Rubber
Rubbers > Group Q
Liquid Silicone Rubber (LSR) | ||||||||
Liquid Silicone Rubber (LSR) is a versatile and economical choice for a wide range of silicone molded parts. Odorless, tasteless and hypoallergenic, it is the ideal material for devices intended to be used in a sterile environment. The LSR is also a set of low compression, high elongation and high thermal stability. As a result, it can be used in a medical environment, in contact with food and in high degrees of thermal conductivity. Silicone rubber is typically supplied in one of three ways: Vulcanization at room temperature (RTV) Liquid (HTV) High consistency rubber (HCR) | ||||||||
Symbols | Structure | |||||||
| | |||||||
Characteristics of liquid silicone rubber | ||||||||
| ||||||||
Propiedades Físico-Mecánicas | ||||||||
The unique physical properties of silicone rubber are the result of its chemical structure. Silicone rubber is an elastomer consisting mainly of a chain of molecules known as a siloxane bond (-Si-O-Si-). This chain is effectively the "backbone" of silicone rubber, to a variety of organic chemical groups that can be added, altering its mechanical and material characteristics. The silicone rubber is distinguished by a higher strength siloxane bond 433 kJ / mol, this contributes to its greater resistance to heat, chemical stability and electrical insulation. At the same time, these links can also be freely rotated. Due to this, the liquid silicone rubber possesses material properties such as a high degree of elasticity and compressibility, as well as water repellency and good reliability. The key properties of the silicone rubber material include its fast curing and low compression set, its tear resistance, heat, water and oil, its transparency and conductivity, and its overall strength and long life. You can use the LSR at temperatures between -90 ° C and 205 ° C, expose it to wind, rain and UV light for long periods of time, or immerse it in water, oil or solvents. The liquid silicone rubber has good elongation, high resistance to tearing and traction, excellent flexibility and a hardness range of 5 to 80 Shore A. Compression set, when an application of silicone rubber products makes it under compression in Heat conditions, the recovery of these materials from compression deformation becomes a crucial consideration. Unlike most organic elastomers, such as EPDM and neoprene, the silicone rubber compression set is consistent over a wide temperature range of -60 ° to + 250 ° C. The selection of an appropriate curing agent and post curing is especially recommended when using silicone material to make molded products that require a low compression set | ||||||||
Silicon processability | ||||||||
The advanced capabilities of liquid silicone injection molding allow silicone rubber parts to fit your company's needs in an infinite variety of shapes, colors and configurations. The tools do not require a polished finish, they are not necessary to help eliminate the finished component of the mold. Once the solidification phase is completed, the molded part of the mold does not worry about distortion or damage. The uncured liquid silicone is started in two vessels, Compound A and Compound B, which are connected to the pumping system. Barrel A contains the base formation material, and barrel B contains a catalyst. A dosage unit is a one-to-one ratio, as well as any pigmentation additive. Once the configuration is finished, the injection mechanism pushes the material towards the mold and the cavities. The post-molding process may include demisting, post-curing. | ||||||||
Applications of liquid silicone rubber | ||||||||
The characteristics of liquid silicone rubber and the chemical properties make it an ideal material for applications that cover several different vertical sectors of the industry. The most common application for silicone rubber is the production of LSR parts. Its resistance to oil and heat offers a long-term durability in automotive components. Its resistance to steam and its low compression set make it an excellent choice for gas appliances and hardware in consumer appliances such as microwaves. Their conductivity and resistance to fatigue make them ideal for electronic interfaces on keyboards or touch panels. | ||||||||