LSR has the capability to fill a thin wall section with fewer challenges. Parts can have a wall as thin as 0.010 in (0.25 mm), depending on the size of the wall and the location of contiguous thicker sections. Rib thickness should be approximately 0.5 to 1.0 times the thickness of the adjacent walls.
The following are approximate part sizes:
· 5 inches by 5 inches by 2 inches (127 mm by 127 mm by 50 mm)
· No deeper than 2 inches (50 mm) from any parting line
· Maximum projected mold area of 17.6 square inches (113.55 sq cm)
· The maximum part volume of 4 cubic inches (65.55 ccs)
The LSR is applied for a uniform wall thickness because of its superior ability to stick well with wall section deviations.
It reduces the mass of the product, and the design is improved.
Generally, a LSR product with less mass and uniform wall thickness would be less in cost.
Determining the location of the parting lines is one of the initial steps in the tooling process. To make the process easier, minimize parting lines to produce cleaner parts and save time.
Well-designed parts usually have a linear tolerance of 0.025 in/in (0.025 mm/mm). You will also need to consider flash allowance.
Liquid injection molding is a process where silicone rubber is vulcanized with a LIM machine. Different from compression, the raw material is liquid silicone rubber (LSR). LSR is a low-viscosity material and can be injected into a LIM mold. The heat from the LIM mold will then be transferred to LSR and after optimal cure time, the product is formed and will be ejected automatically or manually.
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