Silicone Compression Molding
Silicone compression molding uses a measured charge of HCR/HTV silicone in heated tooling to produce the required shape. Send the part drawing, material or hardness requirement, expected quantity and critical dimensions. RUUIPON reviews tooling layout, parting lines, flash control, finishing and inspection needs before quoting.
Common mix-up
"Compression = cheap RTV at volume" is the usual mix-up. Compressing HCR into metal makes a *part*. Recasting RTV still makes a *cavity*. Don't graduate a pectin tray into mill-and-press tooling.
Typical shop values
| Object | Who quotes | Nouns on the traveler |
|---|---|---|
| RTV cavity | RUUIPON | resin master to RTV casting mold |
| HCR *part* | HTV product RFQ here, or ask us | mill, preform mass, flash land, deflash, post-cure |
Reference values only. Confirm material-specific limits against the supplier’s technical data and agree project acceptance criteria before production. Shrinkage depends on the silicone grade, tooling and processing conditions. Use material-specific data and prototype measurements when setting tooling allowances and inspection criteria.
Quoted as a molded silicone article
This page quotes a molded silicone article, not an RTV casting cavity. We would not recommend putting LSR into an open compression cavity. We would not recommend copying RUUIPON MOQ 20 onto a steel HCR tool.
The manufacturing route is selected for the article you need to receive. Tooling, material, inspection requirements, MOQ and lead time are confirmed for the specific project.
Where to send the RFQ
Parts: section thickness, Shore A, annual quantity, and whether flash is allowed on a hidden face - send an HTV product RFQ here.
Molds: pour material, grams, qty - contact. Process split: RTV vs HTV.
Send the drawing or sample, intended use, material requirements and expected quantity. RUUIPON will review the manufacturing route, tooling scope and inspection needs before confirming the quotation.
FAQ
Can you compression-mold my baking *tray* as HCR? The fact that a product is a baking mold does not determine the process by itself. Material, geometry, production quantity and performance requirements guide the selection. Name the object.
Is HTV the production version of an RTV mold? No. Recast RTV when you still pour. Open a new HTV product RFQ or LSR-tool RFQ (ask us) when you need vulcanized parts.
Can I compression-mold LSR? Production LSR is injected (cavity heated, runner usually cold-runner). Don't pour LSR into a compression land. See a finished-parts LSR page.