Silicone Rubber Injection Molding

Silicone rubber injection molding has more than a half-century history since the late 1970s. There are two molding ways of it: Liquid Silicone Rubber Injection Molding (LSR) and Solid Silicone Rubber Molding. There are thousands of applications of silicone rubber injection molding in various industries like medical, automotive, electronics, etc.


As the one of professional silicone injection molding companies, Packson has been working with silicone rubber injection moldnig for many years. Especially for liquid silicone rubber injection molding, we have become OEMs supplier of BD medical for producing medical rubber cathethers. We have the capability to offer liquid silicone rubber injection molding service that start from prototyping to serial production manufacturing.


At Packson, we have equipped with more than 9 liquid silicone rubber injection molding machines with ISO class 8 cleanroom that meets the need of medical contract manufacturing. We are able to provide quick, high-quality service and our professional engineering team who has rich experience in liquid silicone rubber injection molding, to help you in the whole project process. Contact Packson today if you need liquid silicone rubber injection molding service.


Silicone Injection Molding Details and Options

                                                                                 Silicone Injection Molding Details and Options

Lead time

Make your mind in real in 10-30 days; including 24-hour quote responses with design-for-manufacturing (DFM) feedback

What kind of products should Choose LSR

Drug delivery systemsSkin contact devicesValvesSyringe stoppers

How to Choose LSR/HCR in your project

Determining whether LSR or HCR injection moulding is the best choice for your project depends largely on how much production you will need. In general, HCR injection molding is better applied for small volume production. On the contrary, LSR injection molding is more suitable for massive production.


Advantages:Reasonable wall thicknessesCored uniform wall thicknessNo sharp cornersGradual transition from thick to thin thicknessLimitations:Not for high heat or extreme cold applicationsNot inherently UV stableNeed to follow conventional good plastic part design guidelines



Consumer Products;

Special Applications;

Medical And Healthcare Consumables And Devices

Benefits of LSR in Medical areas

High BiocompatibilityInorganic and hypoallergenic natureLack of odor/tasteOzone & UV-safeThermal stabilityLifetime service of the part

Benefits of LSR Solution

Reduce wasteLeverage the material’s characteristicsDeliver consistently high precision parts and componentsAnd all of these at global competitive conditions

Mold Cavities

Single, Multi-cavity, and Family molds;

Machines Available

200 press tonnage

Inspection and Certification Options

ISO9001,ISO13485,ISO 7&8 Medical Clean Room Molding

Mold Life

Less than 5000 shots

The Tolerances in the Steel

Maintain the tolerance ±0.005mm/0.002inch

The Tolerances in the part

Maintain the tolerance ±0.01mm/0.005inch


Standard SiliconeMedical-grade siliconeOptical-grade siliconeFluorosilicone

Mold Finish


Other Options

Consultative Design and Tool Services for freeFinal Finishing OptionsNo MOQQuick-turn shipping in as fast as 1 day


Custom Silicone Rubber Injection Molding Service For Your Business

Liquid silicone rubber molding parts have the feature of durability with good tensile strength and are used to high volume, tight tolerance. Therefore it is widely used in various industries especially for medical parts.


Here are the advantages of liquid silicone rubber:

Excellent insulating properties, good for tight tolerance/precision components

Good tensile strength  with high/low-temperature extremes

Good resistance for water, oxidation also some chemical solutions like acids.


Silicone Rubber injection Molding Process

The silicone dousing unit starts in two parts

composed A and composed B pumps one Part A silicone and one Part B silicone via separate hoses to the static mixer. Cylinder A contains the basic material. while cylinder B contains a catalyst. In addition,  color is pumped to the static mixer via another hose. The mixed components are then fed into the throat of the injection molding barrel by way of a shut-off valve. This is the whole process of silicone rubber injection molding.


Sealing against the mold

Once the silicone material is inside the barrel, a shot of the cool mixed silicone advances to the mold as the nozzle seals firmly against the silicone rubber liquid mold.



The nozzle shut-off valve opens and a measured shot of cool liquid silicone is injected into a hot (275F to 390F) clamped silicone rubber liquid mold.


Barrel retracts from the mold

The nozzle shut-off valve opens and the barrel retracts from the silicone rubber liquid mold, while the screw begins to build another measured shot of cold liquid silicone.


Closes and repeats the procedure

After the cycle is complete, the mold opens and the piece and flashing can be taken off automatically or by an individual worker.  After that, the mold closes and repeats the procedure.


Post-molding process

After removing the article from the mold, the post-molding process may include demisting, post-curation, inspection, and packing.


Silicone Rubber injection Molding Application

Molding Parts

-Silicone rubber injection molding can be qpplied in molding parts. Moulded part is a good way for low quantity production from dozen to hundred of the part even millions of parts. The molding part is better than the part machined by CNC or 3D printing with the same material. The right choice for resin used in the molding part allows for a wide range of properties. Mold is essential medial for the molding part. So molds machined by CNC and Wire cut EDM with high precision and tolerance are enable make thousands of parts.