The best silicone material and molding process cannot be selected from appearance alone. Product function, geometry, target quantity, contact requirements, tolerances, surface expectations and assembly all influence the decision. A clear brief helps the manufacturer recommend a realistic route before tooling begins.
1. Start with the product application
Before discussing material grades or machines, define how the product will be used. A kitchen accessory, baby feeding product, beauty applicator and industrial sealing component may all use silicone, but they do not share the same performance priorities.
A useful application brief should explain:
- Who will use the product and how often it will be handled.
- Whether it touches food, skin, water, oil, chemicals or other materials.
- The expected temperature, cleaning method and service environment.
- Whether flexibility, sealing, grip, insulation, transparency or appearance is the main function.
- The target market and any applicable testing or documentation requirements.
Do not assume that every silicone compound is automatically suitable for every contact requirement. Tell your supplier what the product must do and which market it will enter, then confirm the required material documentation and testing plan.
2. Understand solid silicone and liquid silicone rubber
Solid silicone rubber
Solid silicone rubber is commonly supplied in a gum-like form and can be used in compression molding and other suitable processes. It is widely considered for mats, lids, grips, seals, covers, household products and many custom molded parts. The route can be practical for varied sizes, colors and project volumes, depending on geometry and tooling.
Liquid silicone rubber (LSR)
LSR is a two-component liquid material processed through dedicated injection equipment. It can support suitable precision parts, repeat production and automated molding, especially when the component geometry and forecast volume justify the tooling and process setup. LSR is not automatically the best choice for every project; mold complexity, part design and production economics still need review.
3. Compare the main manufacturing routes
| Route | Often considered for | Key questions before selection |
|---|---|---|
| Compression molding | Solid silicone products, mats, lids, covers, grips, seals and molded components. | Part size, undercuts, wall thickness, parting line, trimming, cavity plan and target quantity. |
| LSR injection molding | Suitable precision components and repeat-volume programs using liquid silicone rubber. | Geometry, tolerance priorities, automation value, cold-runner tooling, expected volume and validation needs. |
| Overmolding and inserts | Silicone combined with plastic, metal or another supporting component. | Material compatibility, insert positioning, bonding method, mechanical lock, deformation and assembly sequence. |
| Finishing and assembly | Trimming, post-curing, printing, laser marking, inspection, assembly and packaging. | Visible-surface standard, logo durability, cleanliness, component fit, packaging and final inspection criteria. |
Learn more about CHANVO's compression molding, LSR injection molding, overmolding and inserts, and finishing and assembly capabilities.
4. Select Shore A hardness by function, not guesswork
Silicone product hardness is commonly discussed using the Shore A scale. A lower number generally feels softer and more flexible, while a higher number generally feels firmer. However, the finished feel also depends on wall thickness, ribs, hollow areas, surface texture and overall geometry.
Instead of choosing a hardness only from a number, compare physical references whenever possible. Ask the manufacturer to evaluate:
- Required deformation, grip, sealing or support.
- How the part should recover after compression or bending.
- Whether thin sections may feel softer than expected.
- Whether color, transparency or additives affect the material direction.
- How hardness will be confirmed during sample approval and production inspection.
For color matching and surface decisions, see our guide to silicone material and color development.
5. Review design and tooling together
A product drawing is not only a list of dimensions. It also determines how material flows, where the mold opens, how the part is removed and which surfaces may show a parting line or gate. Early manufacturability review can reduce unnecessary revisions after mold production.
For a new design, CHANVO can review the project through product design and engineering and mold development and prototyping.
6. Build quality requirements into the quotation
Quality expectations affect cost and lead time, so they should be discussed before quotation rather than after production. Identify the dimensions, appearance limits and functional checks that matter most to the product.
The approved sample should become a clear production reference for color, hardness direction, surface appearance, trimming, logo placement, assembly and packaging. When specifications change, record the revision and confirm which sample or drawing controls production. Explore our silicone quality control approach.
7. Information to send for an accurate quotation
You do not need a perfect technical file to begin, but the following information makes the first review more useful:
- 2D drawing, 3D file, sketch, product photo or physical reference.
- Overall dimensions and any critical fit or functional areas.
- Intended use, target market and contact requirements.
- Expected hardness, color, transparency and surface finish.
- Logo, printing, assembly and packaging requirements.
- Prototype quantity, estimated order quantity and annual forecast when available.
- Required tests, reports, documentation and sample approval process.
- Target timing and whether the project has a fixed launch date.
If some information is still unknown, say so. A manufacturer can organize the open questions more efficiently than working from assumptions that may later change the tooling or quotation.
8. Common mistakes to avoid
- Selecting a material only by price: the compound must first fit the application and required documentation.
- Choosing LSR only because it sounds more advanced: process selection should follow the part and production plan.
- Ignoring geometry when selecting hardness: the same Shore A value can feel different in thin and thick structures.
- Quoting without quantity: tooling layout, cycle planning and unit economics depend on realistic volume.
- Approving only by photos: fit, feel, dimensions and function may require a physical sample review.
- Leaving packaging until the end: packaging can affect cleanliness, deformation, labeling and shipment preparation.
Frequently asked questions
Is LSR better than solid silicone rubber?
Not universally. LSR and solid silicone support different processing routes. The better option depends on geometry, tolerance priorities, expected volume, tooling economics, application and validation requirements.
What Shore A hardness should I choose?
Start with the required function and a physical reference if possible. Wall thickness and product structure affect the finished feel, so the material hardness should be evaluated together with the design.
Can CHANVO quote from a photo or sample?
Yes, an initial review can begin with a photo, sketch or physical reference. Dimensions, intended use, quantity and key requirements will still be needed before tooling and production are confirmed.
What affects the cost of a custom silicone mold?
Part size, geometry, cavities, undercuts, surface requirements, precision, selected process and expected production volume all influence the tooling plan and cost.
What should be approved before mass production?
Confirm the current drawing, material direction, color, hardness, critical dimensions, function, appearance, logo, assembly and packaging standard, with an approved sample where applicable.