The choice of silicone materials to be used in the manufacturing process is not just about selecting a grade or hardness, but is a systematic process of engineering that needs to consider performance, processing, compliance, cost, and consistency in production.
The teams are to consider the six key aspects when choosing silicone materials to manufacture. Our structured silicone material selection process helps ensure all these factors are evaluated early and comprehensively.
Most consumers start by ordering a certain hardness, color or even food-grade silicone. As a matter of fact this information is only a portion of the decision. The appropriate silicone rubber material should correspond to the real operating conditions of the product and the manufacturing process chosen. A carefully chosen silicone material facilitates continuous production, product performance, and consistency in quality in repeat orders — especially for high-quality custom silicone products.
Why Silicone Material Selection Matters Before Manufacturing
The final decision on the material to be used in the tooling process should be made before the tooling process. This is because the choice of material can influence the design of the mold, how it cures, dimensional stability, surface finish and performance of the final product.
The choice of the material determines the whole production process. The defects that can arise due to an inappropriate silicone include flash, voids, defective surface finish, or improper curing. It can also cause dimensional shrinkage, weak bonding in overmolding or premature aging in real-world applications. After tooling, it is usually costly and time-consuming to change the material, and that will require modifications of the mold or even new tooling.
Prior confirmation assists sampling to proceed more successfully and aids in repeatable mass production. The following table presents some of the problems that can be caused by late or incomplete decisions:
| Material Selection Issue | Possible Manufacturing Impact |
| Wrong hardness | Poor fit, weak sealing, uncomfortable touch, or deformation |
| Poor temperature resistance | Cracking, aging, or performance failure |
| Incompatible molding process | Longer cycle time or unstable curing |
| Weak surface compatibility | Printing, coating, or logo adhesion problems — see our surface finishing compatibility options (silk screen, spray coating, laser engraving) |
| Missing compliance confirmation | Delays in approval, testing, or export documentation |
Consideration 1: Product Application and End-Use Environment
The initial step in the choice of silicone materials is knowledge of where and how the product will actually be utilized.
Is the location of the part indoors or outdoor? Does it touch food, skin, pets, or work around electronics, automotive fluids or industrial chemicals? Heat, cold, UV light, moisture, oil, friction, repeated stretching, or aggressive cleaning agents are only some of the factors that affect performance.
A base silicone can behave in various manners, depending on the environment. Something that functions well in a kitchen might crack outside in the UV and changes in temperature. Early environmental analysis avoids failures in the field, extravagant redesigns.
| Product Environment | Material Requirement |
| Food-contact products | Low odor, food-contact suitability, easy cleaning |
| Automotive parts | Heat resistance, oil resistance, compression performance |
| Outdoor products | UV resistance, weather resistance, aging resistance |
| Consumer electronics | Insulation, dimensional stability, clean appearance |
| Pet products | Tear resistance, durability, safe material selection |
| Personal care products | Skin-contact comfort, softness, surface quality |
Consideration 2: Required Material Properties
The choice of material properties should be based on product functionality, rather than a generic assumption about silicone rubber.
To ensure that the final application is compatible with the material used, product teams ought to consider the key factors in silicone material selection before tooling can commence.
Important properties to consider would be:
- Temperature resistance (continuous and peak)
- Tear strength
- Tensile strength
- Elongation and recovery
- Compression set
- Chemical resistance
- Electrical insulation
- Stability of odor and color.
| Material Property | Why It Matters |
| Temperature resistance | Prevents deformation, cracking, or aging under heat/cold |
| Tear strength | Helps products resist ripping during use |
| Tensile strength | Supports stretching and load-bearing performance |
| Elongation | Affects flexibility and recovery after stretching |
| Compression set | Critical for seals, gaskets, and cushioning parts |
| Chemical resistance | Reduces degradation from oils, solvents, or cleaners |
| Electrical insulation | Important for electronic and industrial components |
Consideration 3: Hardness and Mechanical Performance
The choice of silicone hardness depends on the way the product needs to bend, seal, grip, cushion, stretch or hold its shape.
Hardness is used in Shore A. The lower ones are softer and more flexible but not as stable. The latter are better shaped but may be hard and decrease sealing performance. In real geometry, sample testing is often necessary due to the different behavior of hardness in thin versus thick sections.
| Shore A Hardness Range | Typical Feel / Behavior | Common Use Cases |
| 10–30 Shore A | Very soft, flexible, cushioning | Soft touch parts, baby products, wearables |
| 30–50 Shore A | Balanced flexibility and stability | Kitchenware, sleeves, buttons, pet products |
| 50–70 Shore A | Firmer, better shape retention | Gaskets, seals, plugs, industrial parts |
| 70+ Shore A | Rigid feel for silicone | Structural or high-support components |
Consideration 4: Manufacturing Process Compatibility
A silicone material should be able to conform to the planned manufacturing process otherwise sampling and mass production will be unstable.
Various processes require various forms and behaviors of materials:
- Compression molding uses high-consistency rubber (HCR) and is adapted to thicker or simpler geometries.
- Low-viscosity materials and fine tooling are required in liquid silicone rubber (LSR) injection molding of high volume and tight-tolerance parts.
- Co-injection or overmolding requires materials that have good bonding properties.
- In extrusion, there should be constant flow of profiles and tubes.
The flow of material, speed of curing, rate of shrinkage, as well as thickness, influence the process that is viable.
| Manufacturing Process | Material Consideration | Suitable Product Types |
| Compression molding | Works well with solid silicone / HCR | (ideal for silicone compression molding) Mats, sleeves, seals, kitchenware, pet products |
| Liquid injection molding | Requires Liquid Silicone Rubber (LSR) injection molding and precision tooling | High-volume precision parts, medical or baby products |
| Co-injection molding | Requires compatible materials | Multi-color or multi-material silicone products |
| Extrusion | Requires consistent flow and profile stability | Tubes, strips, profiles, continuous sealing parts |
Consideration 5: Compliance and Safety Requirements
The compliance should be taken into account at the stage of selecting material since the requirements of testing, documentation and export may directly influence the schedule of product introduction.
Target markets define the required certifications FDA, LFGB, REACH, RoHS, and so on. The term food-grade has a wide variety of definitions, depending upon the regulation and testing measures. Baby products and products that are in contact with the skin tend to have higher limits on volatiles and extractables.
Early confirmation of these needs will prevent last minute re-formulation of the need or shipment failures.
| Product Category | Common Compliance Consideration |
| Kitchenware and baking tools | Food-contact suitability, odor control, temperature stability |
| Baby products | Safety, hygiene, low odor, strict material documentation |
| Personal care products | Skin-contact comfort and material safety |
| Electronics accessories | RoHS / REACH-related material restrictions |
| Industrial parts | Performance testing, environmental resistance |
Consideration 6: Cost, Scalability, and Long-Term Quality Consistency
The most economical cost of material is not necessarily the lowest cost of material when it results in a higher defect rate, inconsistent production or inconsistent repeat-order.
Assess total landed cost, yield, cycle time, scrap rate and long-term quality consistency — including batch-to-batch repeatability.A higher grade material may present some better overall economics through smoother production and less quality claims.
| Cost Factor | Why It Should Be Evaluated |
| Raw material price | Affects unit cost but does not show full production risk |
| Cycle time | Influences production efficiency and lead time |
| Defect rate | Poor material matching can increase scrap |
| Color consistency | Important for branded consumer products |
| Batch repeatability | Critical for long-term OEM/ODM orders |
| Testing requirements | May affect approval cost and delivery timeline |
Common Mistakes Before Selecting Silicone Materials
The vast majority of the silicone material problems are the result of premature decision making without sufficient information about the application, process, testing and scale of production. Frequent pitfalls include:
- Selection of material on the basis of hardness alone.
- Ordering food-grade silicone without ensuring the standard of the target market.
- Disregarding compression set in the sealing of products.
- Choosing material and not making sure of the molding process.
- Ignoring compatibility of surface finishing (printing, laser engraving, coating)
- Comparison of prices of raw materials only.
- Omitting test of real-use conditions on samples.
- Substituting materials once they have been moulded.
Practical Checklist Before Confirming Silicone Material
By just having a checklist, the product teams can minimize risk before exiting concept phase and going to mold development phase.
| Question to Confirm | Why It Matters |
| What is the product’s main function? | Determines key material properties |
| Will it contact food, skin, pets, or electronics? | Affects safety and compliance needs |
| What temperature range will it face? | Helps prevent aging or deformation |
| Will it stretch, compress, bend, or seal? | Guides hardness and mechanical requirements |
| What molding process will be used? | Ensures material-process compatibility |
| Is surface finishing required? | Affects printing, spraying, or engraving suitability |
| What market will the product be sold in? | Determines required documentation and testing |
| What production volume is expected? | Supports cost and scalability planning |
Conclusion — Selecting Silicone Materials Is a Manufacturing Decision
The product teams must consider more than just hardness, color, or cost when deciding which silicone materials to use to manufacture the product. An effective decision takes into account the actual environment of use of the product, the performance required, the process of molding, compliance requirements and repeat production expectations. These six factors should be considered early on because that way, silicone products are bound to deliver the same performance on sampling through mass production.
Excellent selection of silicone material aids both superior product functionality and reliable production results. Partnering with an experienced OEM & ODM silicone manufacturing team makes these early considerations far more effective and scalable.Early design is a way to avoid costly surprises down the line and it is a way of producing reliable custom silicone products that will not disappoint by order after order.
