Liquid Silicone Rubber (LSR) Molding Service
| AS9100D | ISO9001 | ISO14001 | IATF 16949
About LSR Injection Molding
Liquid Silicone Rubber (LSR) injection molding is a high-performance, two-part, thermoset elastomer that exhibits organic and inorganic characteristics. It is a process to produce reliable, durable parts in high volume. It covers thousands of applications across various industries, including medical, automotive, infant care, general industrial markets, aerospace, electronics, and many other specialized industries. While liquid silicone rubber injection molding works best for short- and long-run part production, customers can employ the process in the final prototyping stages. The process is also suitable for evaluating different material configurations before green-lighting a project for total production.
Advantages of LSR Molding
Liquid silicone rubber is high purity platinum cured silicone with a low compression set, excellent stability and ability to resist extreme temperatures of heat and cold, ideally suitable for the production of parts, where high quality is a must. Due to the thermosetting nature of the material, liquid silicone injection molding requires special treatment, such as intensive distributive mixing, while maintaining the material at a low temperature before it is pushed into the heated cavity and vulcanized.
Biocompatibility
As per testing, liquid silicone rubber has demonstrated superior compatibility with human tissue. Compared with other elastomers, LSR is resistant to bacteria growth and will not stain or corrode other materials. LSR is also tasteless and odorless and comply with stringent FDA requirements.
Durability
LSR parts can withstand extreme temperatures, making them ideal for components under the hood of cars and close to engines. Parts fabricated via liquid silicone rubber injection molding are fire retardant and will not melt.
Electrical properties
LSR has excellent insulating properties, which offer an appealing option for many electrical applications. Compared to conventional insulating material, silicone can perform in far higher and lower temperatures.
Temperature resistance
Compared to other elastomers, silicone can withstand a wide range of high/low-temperature extremes.
Mechanical properties
LSR has good elongation, high tear and tensile strength, excellent flexibility and a hardness range of 5 to 80 Shore A.
Chemical resistance
Liquid silicone rubber resists water, oxidation, and chemical solutions such as acids and alkali.
Material options
Moxperts offer a wide variety of certified alloys for rapid insert injection molding services. If the material is not listed, feel free to contact us for a customized solution.
- Methyl Group – Also known as dimethyl silicone elastomer/rubber or simply methyl silicone rubber. MQ also refers to it.
- Methyl and Phenyl Groups – Also known as methyl-phenyl silicone elastomer/rubber or phenyl silicone rubber. It is referred to as PMQ, and it has an excellent low-temperature performance
- Methyl and Vinyl Groups – Also known as methyl vinyl silicone elastomer/rubber. It is referred to as VMQ as well.
- Methyl, Phenyl and Vinyl Groups – It is also referred to as PVMQ and is known for its excellent low-temperature performance.
- Fluoro, Vinyl and Methyl Groups – Also known as fluorinated rubber or fluorosilicone rubber. It is referred to as FVMQ, and they are highly resistant to attach (fuel, oil, solvent…) chemically.
- Solid Silicone Rubber or High-Temperature Vulcanized, HTV – Solid silicone rubber contains polymers with a high molecular weight and relatively long polymer chains. They are available in an uncured form and require traditional rubber processing techniques.
- Liquid Silicone Rubber, LSR – Liquid silicone rubber contains lower molecular weight polymers and, hence, shorter chains. It has better flow properties. It is processed on specially designed injection molding and extrusion equipment.
- Room Temperature Vulcanized, RTV – RTV silicone rubber is a type of silicone rubber made from one-part (RTV-1) or two-component (RTV-2) systems whose hardness range of very soft to medium. They are available for potting, encapsulations, sealants etc.
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Finishing Services
As molded
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Standards for plastic injection molding surface finishes established by Society of Plastic Industry (SPI).
- Grade A: Glossy Injection Molding Surface Finish. Min. roughness: 0.012 μm. Mainly for Acrylic, PC.
- Grade B: Semi-Glossy Injection Molding Surface Finish. Min. roughness: 0.05 μm. Mainly for ABS, HDPE, Nylon, PP, Polystyrene.
- Grade C: Matte Injection Molding Surface Finish. Min. roughness: 0.35 μm. Mainly for ABS, HDPE, Nylon, PP, Polystyrene.
- Grade D: Textured Injection Molding Surface Finish. Min. roughness: 0.80 μm. Mainly for ABS, HDPE, Nylon, PP, Polystyrene, TPU.
