Suitable for small batches of flexible samples, sealing auxiliary parts, Soft Rubber housings, cushioning parts, buttons, protective covers, foot pads, soft-touch parts, and mold replication materials requiring elastic validation.
Silicone Rubber is a material solution for small-batch production of flexible, elastic, and soft-touch parts, suitable for producing Soft Rubber samples through Silicone Rubber molds, vacuum pouring, or low-pressure mold replication. It has good softness, resilience, heat resistance, water resistance, and tactile performance, and is commonly used for sealing rings, soft pads, buttons, protective covers, foot pads, cushioning parts, medical device appearance samples, consumer electronics Soft Rubber components, and flexible structure verification during product development.
By focusing on application scenarios, boundaries of advantages, and non-recommended scenarios, it helps sales, customer service, and quoting staff quickly determine whether the material meets current part requirements.
Good softness, good resilience, comfortable touch, good temperature resistance, good water resistance, and aging resistance, suitable for small batch production, no need for formal Silicone Rubber molding or LSR injection molds, suitable for validating Soft Rubber structures, and suitable for sealing and buffering samples.
Silicone Rubber buttons, sealing rings, Soft Rubber pads, foot pads, anti-slip pads, cushioning pads, shock absorbers, protective covers, Soft Rubber housings, medical device soft-touch samples, consumer electronics Soft Rubber parts, wearable device watch strap samples, tool handles, Soft Rubber pieces, Silicone Rubber plugs, Silicone Rubber sets, soft components, and sealing samples with low to medium requirements.
High-precision long-term mass production parts, high-strength load-bearing parts, high rigidity structural parts, high wear-resistant motion parts, high-frequency friction parts, high-strength threaded parts, high-gloss hard appearance parts, transparent optical parts, long-term strong acid and strong alkali environment parts, food long-term contact and uncertified parts, medical implant parts, and functional parts requiring extremely high performance in real LSR mass production.
The following parameters come from product information and material knowledge fields, used for design review, quotation communication, and preliminary judgment before material selection.
| Material positioning | Suitable for small batches of flexible samples, sealing auxiliary parts, Soft Rubber housings, cushioning parts, buttons, protective covers, foot pads, soft-touch parts, and mold replication materials requiring elastic validation. |
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| Precision performance | Vacuum Casting Silicone Rubber is suitable for standard Soft Rubber samples and flexible assembly verification, with dimensional accuracy usually lower than CNC rigid materials and formal injection-molded parts. Because Silicone Rubber is soft and elastic, measurement results are affected by clamping force, compression amount, hardness, and ambient temperature. Thin-walled parts, large parts, elongated parts, complex hole positions, and highly elastic structures are more prone to dimensional fluctuations or local deformation. |
| Dimensional tolerances | The conventional dimensional tolerances for vacuum casting Silicone Rubber can be referenced ± 0.30mm to ±0.80mm; Small sizes, higher Silicone Rubber hardness, and simpler structures are easier to control, while large parts, low hardness, thin-walled parts, elongated parts, and complex assemblies may have deviations of ±0.80mm-±1.50mm or more. This value is a standard reference range and does not guarantee absolute tolerances for all structures. Sealing positions, assembly holes, button travel, and overmolding boundaries are recommended for separate evaluation. |
| Minimum Wall Thickness | It is recommended that the wall thickness be no less than 1.0mm-1.5mm. Low hardness Silicone Rubber it is not recommended to make large areas too thin, otherwise they are prone to deformation, tearing, difficult demolding, or curling after assembly. Non-stressed thin edges can be locally thinned according to the structure, but sealing, stretching, clamping, and assembly positions should be appropriately thickened. |
| Recommended wall thickness | Standard Silicone Rubber pads, protective covers, Soft Rubber housings, and cushioning components are recommended 1.5mm-3.0mm; sealing rings, buttons, foot pads, and compression structures are recommended 2.0mm-4.0mm; positions requiring repeated pressing, stretching, insertion, or compression should be appropriately thickened according to hardness, compression rate, rebound, and assembly space. |
| Minimum aperture | The recommended hole diameter should not be less than 1.5mm-2.0mm. Low hardness Silicone Rubber small holes are prone to unstable pore size due to springback, shrinkage, or demolding stretching. Deep holes, elongated holes, and sealed holes are recommended for post-processing or enlargement through structural enlargement. Assembly holes, wire punching, and positioning holes should consider material springback and long-term deformation to avoid overly tight design. |
| Assembly clearance | For ordinary assembly, it is recommended to reserve 0.30mm-0.80mm on one side; Soft Rubber sleeve, sealed compression, and elastic cladding structures can be designed with appropriate interference according to hardness and compression amount. Sealing structures should focus on controlling the compression ratio; generally, excessive compression is not recommended to avoid permanent deformation or assembly difficulties. Low hardness Silicone Rubber can compensate for dimensional errors by elasticity, but long-term pressure may cause loosening or deformation. |
| Detailed performance | Vacuum Casting Silicone Rubber can replicate the logo, shallow texture, raised ribs, grooves, button contours, and anti-slip textures on the mother mold, but the detail clarity is lower than that of hard plastic and metal. For raised text, recessed text, and anti-slip textures, it is recommended to be no less than 0.5mm-1.0mm. Low hardness Silicone Rubber details are prone to rounding, softening, or peeling and scratching; High hardness Silicone Rubber clearer detail rendering. Fine sharp edges and thin edges are not recommended for use in main load-bearing areas. |
| Surface effect | Vacuum Casting Silicone Rubber can be customized in transparent, semi-transparent, milky white, black, gray, or various other colors, with surfaces typically soft, slightly elastic, skin-friendly, or non-slip to the touch. The surface effect depends on the quality of the master mold, the condition of the Silicone Rubber, the material formulation, and the post-processing method. Matte surfaces are better suited for anti-slip and tactile parts, while high-transparency surfaces are more prone to exposing bubbles, impurities, and flow marks. Silicone Rubber surfaces easily attract dust, so dust protection is needed during packaging and storage. |
Based on material characteristics and suitable product ranges, customer needs are broken down into easier application directions to determine.
Silicone Rubber buttons, sealing rings, Soft Rubber pads, foot pads, anti-slip pads, cushioning pads, shock absorbers, protective covers, Soft Rubber housings, medical device soft-touch samples, consumer electronics Soft Rubber parts, wearable device watch strap samples, tool handles, Soft Rubber pieces, Silicone Rubber plugs, Silicone Rubber sets, soft components, and sealing samples with low to medium requirements.
Suitable for small batches of flexible samples, sealing auxiliary parts, Soft Rubber housings, cushioning parts, buttons, protective covers, foot pads, soft-touch parts, and mold replication materials requiring elastic validation.
The core features of vacuum casting Silicone Rubber are softness, elasticity, and good tactile performance, making it suitable for quickly achieving prototype results close to Soft Rubber during the R&D phase. Different hardness levels can be selected according to requirements, commonly expressed as Shore A hardness, such as the softer 20A-30A, the medium softness 40A-60A, and the harder around 70A. Silicone Rubber parts are suitable for sealing, cushioning, anti-slip, and flexible assembly, but dimensional accuracy, surface consistency, and batch stability are usually inferior to the mass production processes Silicone Rubber formal LSR injection molding or compression molding.
Based on wall thickness, hole position, assembly clearance, dimensional tolerances, and material usage risks, determine in advance whether the part structure is suitable for Silicone Rubber.
Post-processing of Silicone Rubber affects appearance, dimensions, hole position, assembly clearance, and usage validation results, and should be explained in advance during quotation, DFM review, and sample confirmation stages.
Post-processing should focus on appearance display, dimensional fitting, connection assembly, and testing verification. Parts involving assembly positions need to be reserved in advance for machining, coating, and trial assembly allowances.
For common issues such as threads, snaps, strength, temperature resistance, and weather resistance, identify in advance whether the material needs to be replaced or if another processing method should be used.
When customer demand exceeds Silicone Rubber material boundaries, it is necessary to combine strength, temperature resistance, toughness, long-term stability, and mass production goals to promptly recommend alternative materials or processing technologies.
If full-scale mass production and more stable performance are needed, liquid Silicone Rubber injection LSR or solid Silicone Rubber molding can be chosen; If higher wear resistance and load-bearing capacity are required, Rubber-Like TPU or PU urethane adhesive can be chosen; If lower-cost Soft Rubber parts are needed, TPE or soft Polyvinyl Chloride (PVC) can be chosen; If rigid structural components are needed, ABS, Polycarbonate (PC), Acetal (POM), Nylon (PA), or metal materials can be chosen; If high chemical resistance and low friction are required, PTFE or fluororubber can be chosen.
If customers need to verify Soft Rubber touch feel, sealing effect, cushioning effect, button tactile feel, or flexible assembly structure in small batches, vacuum casting Silicone Rubber is the appropriate choice. If customers require mass production consistency, food-grade certification, medical-grade certification, long-life sealing, or long-term weather reliability, it is recommended to use formal LSR injection molding, Silicone Rubber molding, or certified-grade Silicone Rubber materials. When selecting materials, first confirm hardness, color, transparency, springiness, compression amount, operating temperature, and contact medium.
After uploading 3D/2D drawings and supplementing materials, quantities, tolerances, surface treatments, and delivery requirements, XPartsLab will provide next steps in 3D printing manufacturability, cost, and delivery pathways.
