Compression Molding
Primary silicone route with 20+ presses, 200–400T capacity, and parts up to 800×1200mm
Silicone Compression Molding
Compression molding places a pre-weighed silicone charge into an open cavity. Heat and tonnage close the mold, the compound cures in place, and the part is then demolded and deflashed.
At SIKING, it is the standard route for HTV silicone parts that need dependable press capacity, large-format tooling support, and DFM review tied to the final geometry.
- Primary material: HTV solid silicone
- Hardness range: 0–90 Shore A
- Approved suppliers: Dow, Wacker ELASTOSIL, Shin-Etsu
- Large-format press: 400-ton, up to 800×1200mm
Compression Molding Specs
| Parameter | Specification |
|---|---|
| Press Tonnage Range | 200 – 400 ton |
| Number of Presses | 20+ |
| Large-Format Press | 400 ton — up to 800mm × 1200mm parts |
| Primary Material | HTV Solid Silicone |
| Hardness Range | 0–90 Shore A |
| Material Suppliers | Dow, Wacker ELASTOSIL, Shin-Etsu |
| MOQ Guidance | 1,000 units for tooled parts |
| Tolerance Planning | Confirmed at DFM review against geometry and critical dimensions |
Compression stays strongest where scale and geometry are steady
This route carries the broadest in-house silicone press footprint, so it works when part size, tooling economy, and dependable press capacity matter more than finer-route complexity.
Critical tolerance planning still happens during DFM review, which keeps geometry-sensitive promises tied to the actual part instead of a generic standard line.
Large parts without outside sourcing
The 400-ton press keeps larger silicone parts inside one manufacturing system instead of handing oversized work to a second supplier.
Wide material window
The published 0-90 Shore A range and approved supplier set give engineering room to tune feel, sealing, and durability before tooling is released.
DFM-led tolerance planning
Compression capability depends on geometry, wall section, and critical dimensions, so tolerance planning is locked at DFM review rather than assumed from a generic standard.
Compression Molding — Step by Step
Material Preparation
Compound is selected, weighed, and logged for traceability.
Mold Loading
The heated mold is loaded, and inserts are positioned where required.
Press & Cure
The press closes under defined tonnage and cure conditions matched to the compound and geometry.
Deflash
Flash is removed with the method suited to the part geometry and cosmetic requirement.
Inspection & Pack
Parts are checked to drawing and control plan, then packed under the same batch record.
Best Suited For
- Large gaskets and seals requiring a single-piece form
- Thicker-section silicone parts
- Medium-to-high hardness components
- Programmes where tooling economy matters
- Parts where standard parting lines and deflash are acceptable
Not Suited For
- Features better suited to LSR precision
- Very thin-wall structures
- Very high-volume production where cycle time dominates
- Parts where flash cannot be tolerated
- Complex insert-led geometries better suited to transfer molding
Compression Molding — FAQ
Request a Compression Molding Review
Send drawings for DFM review, process selection, and quotation tied to geometry, material, and volume.