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Material Selection Method and Filtration Purpose of Silicone Rubber Compounding

Ⅰ. Selection of Silicone rubber compounding


The silicone rubber compounding is mainly divided into precipitation silica gel, fumed silica gel, and vulcanized and colored silica gel. For the selection of small silicone rubber product manufacturers, vulcanized and colored silica gel is the most economical, and fumed silica gel has the best quality.


The higher the utilization rate, regardless of the type of silicone rubber compounding, the lower the cost. Utilization rate = net weight of the silicone product / the weight of the raw materials.


However, if it is precipitation silica gel, it has not been processed by rubber mixing. So it is necessary to add vulcanizing agent and color through artificial rubber mixing, and then put it into the mold after manual cutting before it can be produced.


But from an aesthetic point of view, the vulcanized and colored silica gel is beautiful, and the vulcanized and colored silica gel can be formulated into corresponding colors according to the actual product needs of users.


If you want red, purple, blue silicone and other colors of the raw materials, you can carry out a 1:1 personalized ratio, and the color similarity is as high as 95%. And silicone rubber product manufacturers can directly supply users to use after mixing rubber.


Depending on the amount of material utilized, some silicone rubber product factories will choose to independently mix rubber and purchase their own colors. If you want to independently mix rubber, you'll need to invest in a machine as well as the labor expenditures associated with the refiner.


Independent refining can save production costs if the quantity of material used per day is more than 1 ton; if the amount of material used per day is not great, it is apparent that direct purchase of sulphur-added and color-added silicone is reasonable.


Ⅱ. What is the role of filtering in silicone rubber compounding?


The filtering and extrusion process is the final stage of the silicone rubber compounding process, followed by cooling and packing. So, what is the role of filtering in silicone rubber compounding?


The main goal of silicone rubber compounding filtration is to remove impurities from the compounding material, which is then pre-formed into a square sized piece that can be packed and delivered for sale.


The main process of silicone rubber compounding and filtration is to place a high-mesh filter screen in the extrusion molding filter for filtering and extrusion, and then put the silicone rubber compounding blank rubber into the screw.


Extrusion eliminates impurities through a screen and then preforms the rubber into a predetermined size square in a predetermined model for convenient packing.


Because the width and height of silicone rubber products remain the same after extrusion, the length is not limited, some makers of silicone rubber products do not need to box the product for their own use, instead merely filtering it.


The silicone rubber compounding filter is typically a 200 mesh filter, as a higher mesh can cause the rubber to clog quickly, while a lower mesh can allow minute contaminants to pass through the filter.


If a slow flow of rubber is encountered during the filtering process, the filter should be replaced as soon as possible; the frequency of replacement is determined by the number of impurities in the rubber material.


Some silicone rubber compounding companies do not filter the rubber, instead add sulphur and color, however this is a very demanding workplace environment that must be free of dust and pollutants.


Unfiltered silicone rubber compounding has a worse quality and cleanliness than filtered silicone rubber compounding. Impurities can be found in unfiltered substances.


As a result, if the impurities are too large, the production of silicone rubber products can easily result in scrap and even mold damage.

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