Suitable for Soft Rubber housings, protective covers, floor mats, cushioning parts, anti-slip parts, soft buttons, sealing auxiliary parts, overmolding samples, and small-batch replicated parts requiring flexible tactile validation.
Soft Rubber is a molding material used in small batches to produce flexible, elastic, and soft-touch parts, typically using soft polyurethane resin or rubber-like resin to simulate the tactile feel and elasticity of TPE, Rubber-Like TPU, rubber, or partially Silicone Rubber materials. It is suitable for manufacturing protective covers, Soft Rubber housings, foot pads, cushioning pads, sealing auxiliary parts, anti-slip parts, buttons, coated samples, and flexible assembly validation parts during the R&D phase. Compared to rigid ABS mold materials, Soft Rubber molded parts are better suited for verifying hand feel, resilience, coverage, and cushioning effects; Compared to formal Soft Rubber injection molding, it does not require formal steel molds, making it suitable for small-batch trial production and customer confirmation.
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.
Soft and comfortable to the touch, relatively elastic, suitable for small-batch replication, no need for formal injection molds, fast delivery, suitable for tactile validation, cushioning and shock absorption verification, suitable for soft-hard combination samples, selectable hardness, suitable for R&D trial production and customer display.
Soft Rubber protective covers, electronic products Soft Rubber housings, foot pads, anti-slip pads, cushioning pads, shock absorbers, soft buttons, sealing auxiliary parts, tool handles Soft Rubber samples, rubber-coated samples, wearable device Soft Rubber parts, medical device soft-touch shell samples, consumer electronics soft structural parts, clamp soft contact blocks, anti-collision blocks, plugs, and sheaths , small-batch flexible assembly parts.
Long-term mass production final parts, high-precision sealing parts, high-strength load-bearing parts, high-rigidity structural parts, high wear resistance and high-speed moving parts, high-temperature long-term use parts, strong acid and alkali environment parts, long-term direct contact parts of food, medical implant parts, high-frequency fatigue snap fasteners, high-strength threaded parts, and functional parts with extremely high performance requirements for real Rubber-Like TPU/TPE/Silicone Rubber.
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 Soft Rubber housings, protective covers, floor mats, cushioning parts, anti-slip parts, soft buttons, sealing auxiliary parts, overmolding samples, and small-batch replicated parts requiring flexible tactile validation. |
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| Precision performance | Vacuum Casting replication Soft Rubber suitable for ordinary flexible samples and assembly verification, with dimensional accuracy usually lower than that of rigid mold replication materials, CNC parts, and formal injection molded parts. Because the material is soft and elastic, the measurement results are affected by clamping force, hardness, compression amount, and ambient temperature. Low hardness, large size, thin walls, elongated shapes, overmolding boundaries, and complex hole positions are more prone to dimensional fluctuations or local deformation. |
| Dimensional tolerances | The conventional dimensional tolerances for vacuum casting Soft Rubber can be referenced ± 0.30mm to ±0.80mm; Small sizes, higher hardness, and simple structures are easier to control, while large parts, low hardness parts, thin-walled parts, elongated parts, overmolded 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, overmolding boundaries, and button travel are recommended for separate evaluation. |
| Minimum Wall Thickness | It is recommended that the wall thickness be no less than 1.0mm-1.5mm. For low hardness Soft Rubber it is not recommended to be too thin in large areas, otherwise it is prone to deformation, tearing, material shortages, difficult demolding, or edge curling after assembly. Non-stress-bearing thin edges can be locally thinned, but sealing, stretching, clamping, fitting, and assembly positions should be appropriately thickened. |
| Recommended wall thickness | Ordinary Soft Rubber housing, protective cover, foot pads, and cushioning pads are recommended 1.5mm-3.0mm; sealing auxiliary parts, soft buttons, anti-collision blocks, and compression structures are recommended 2.0mm-4.0mm; positions requiring repeated pressing, stretching, insertion, or compression should be appropriately thickened according to hardness, springback, compression rate, and assembly space. |
| Minimum aperture | The recommended hole diameter should not be less than 1.5mm-2.0mm. Low hardness Soft Rubber small holes are prone to unstable pore size due to springback, shrinkage, or demolding stretching. It is recommended to enlarge deep holes, elongated holes, and assembly holes appropriately, and for post-processing and trimming if necessary. Threading holes, positioning holes, and fitting holes should consider material springback and long-term deformation to avoid over-tight design. |
| Assembly clearance | For ordinary assembly, it is recommended to reserve 0.30mm-0.80mm on one side; Soft Rubber sleeve, coverage, press-in, and sealing structures can be designed with appropriate interference according to hardness and compression amount. Sealing auxiliary structures should focus on controlling the compression rate, avoiding excessive compression to avoid permanent deformation or assembly difficulties. Low hardness Soft Rubber can be compensated for by elastic compensation for dimensional errors, but long-term pressure may cause loosening or deformation. |
| Detailed performance | Vacuum Casting replication Soft Rubber can replicate logos, shallow textures, anti-slip patterns, raised ribs, grooves, button contours, and overmolding boundaries from the master mold, but the detail clarity is lower than that of hard plastics and metals. For raised text, recessed text, and anti-slip textures, it is recommended to be no less than 0.5mm-1.0mm. Low hardness Soft Rubber details are prone to rounding, softening, or peeling and scratching; High hardness Soft Rubber clearer detail rendering. Fine sharp edges and thin edges are not recommended for use in main load-bearing areas. |
| Surface effect | Vacuum Casting Soft Rubber can achieve black, white, gray, translucent, transparent yellow, colored, or custom color effects, with surfaces typically soft, slightly elastic, non-slip, or rubbery to the touch. The surface effect depends on the quality of the master mold, the state of the Silicone Rubber, the hardness of the material, and the post-processing method. Matte surfaces are better suited for non-slip and tactile parts; high transparency or light colors Soft Rubber more prone to exposing bubbles, impurities, flow marks, and yellowing. Soft Rubber surfaces easily attract dust, so exterior parts require proper cleaning and packaging protection. |
Based on material characteristics and suitable product ranges, customer needs are broken down into easier application directions to determine.
Soft Rubber protective covers, electronic products Soft Rubber housings, foot pads, anti-slip pads, cushioning pads, shock absorbers, soft buttons, sealing auxiliary parts, tool handles Soft Rubber samples, rubber-coated samples, wearable device Soft Rubber parts, medical device soft-touch shell samples, consumer electronics soft structural parts, clamp soft contact blocks, anti-collision blocks, plugs, and sheaths , small-batch flexible assembly parts.
Suitable for Soft Rubber housings, protective covers, floor mats, cushioning parts, anti-slip parts, soft buttons, sealing auxiliary parts, overmolding samples, and small-batch replicated parts requiring flexible tactile validation.
The main features of vacuum casting Soft Rubber are softness, elasticity, and good tactile feel, making it suitable for quickly verifying the tactile feel, assembly, coverage, cushioning, and anti-slip effects of Soft Rubber parts. Different hardness levels can be selected according to requirements, commonly classified by Shore A hardness, such as softer 30A-40A, medium softness 50A-70A, and harder 80A-90A. Soft Rubber mold materials are generally suitable for short-term samples and small-batch trials, but their long-term wear resistance, weather resistance, oil resistance, compression resistance to permanent deformation, and batch consistency are generally not as good as formal Rubber-Like TPU, TPE, Silicone Rubber, or rubber mass-produced materials.
Based on wall thickness, hole position, assembly clearance, dimensional tolerances, and material usage risks, determine in advance whether the part structure is suitable for Soft Rubber.
Post-processing of Soft 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 Soft 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 real Rubber-Like TPU performance is required, injection molding Rubber-Like TPU or CNC/casting PU can be chosen; If you need authentic TPE feel and mass production validation, TPE injection molding is available; If better temperature resistance, aging resistance, and skin-friendliness are needed, options include Silicone Rubber molding, LSR liquid Silicone Rubber injection molding, or Silicone Rubber molding; If higher wear resistance and load-bearing capacity are required, PU Urethic Adhesive can be chosen; If rigid structural parts are needed, you can choose ABS molds, CNC ABS, Polycarbonate (PC), Acetal (POM), or injection-molded hard plastic materials.
If customers need to verify Soft Rubber tactile feel, overmolding effect, cushioning effect, anti-slip performance, low-frequency snap-ons, or flexible assembly structures, vacuum casting Soft Rubber is the appropriate choice. If customers require mass production consistency, long-lasting sealing, high wear-resistant rollers, long-term outdoor weather resistance, food-grade, medical-grade, or genuine material certification, they should prioritize formal Rubber-Like TPU, TPE, Silicone Rubber, rubber, or PU mass production processes. Before selecting materials, confirm hardness, color, transparency, hand feel, springback, compression amount, contact medium, and operating temperature.
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.
