Si-TPV 3521-70A | Soft-Touch, Skin-Friendly Elastomer for Wearable & Electronic Device Overmolding
describe:
SILIKE Si-TPV 3521-70A thermoplastic elastomer is a dynamic vulcanized thermoplastic silicone-based elastomer made using a special compatible technology that ensures silicone rubber is evenly dispersed in TPU as 2-3 micron particles under a microscope. These unique materials combine the strength, toughness, and abrasion resistance of thermoplastic elastomers with the desirable properties of silicone: softness, a silky feel, UV light resistance, and chemical resistance, while being recyclable and reusable in traditional manufacturing processes.
SEND EMAIL TO US
Applications
The SILIKE Si-TPV 3521 -70A silicone elastomer solutions for soft-touch, skin-friendly overmolding. It provides excellent adhesion to polar substrates like polycarbonate (PC), ABS, and similar materials. This elastomer is the ideal solution for applications in wearable electronics and portable devices, including: smartphone and portable Electronics casess, smartwatch Bands and Straps, wearable Devices and Accessories.
With its unique combination of softness, durability, and superior adhesion, the Si-TPV 3521 Series enhances the tactile experience, making it perfect for consumer electronics that demand both comfort and performance.
Features & Benefits
- Soft silky feel
- Good scratch resistance
- Excellent bonding to PC, ABS
- Superhydrophobic
- Stain resistance
- UV stable
Characteristics
- Compatibility: TPU, PC, PMMA, PA
Typical Properties
| Test* | Property | Unit | Result |
| ISO 868 | Hardness (15 seconds) | Shore A | 71 |
| ISO 1183 | Specific Gravity | 1.17 | |
| ISO 1133 | Melt Flow Index 10 kg & 190℃ | g/10 min | 47 |
| ISO 37 | MOE ( Modulus of elasticity) | MPa | 7.6 |
| ISO 37 | Tensile Strength | MPa | 17 |
| ISO 37 | Tensile Stress @ 100% Elongation | MPa | 3.5 |
| ISO 37 | Elongation at break | % | 646 |
| ISO 34 | Tear Strength | kN/m | 52 |
| ISO 815 | Compression Set 22 hours @23℃ | % | 26 |
*ISO: International Standardization Organization
ASTM: American Society for Testing and Materials
How to use
● Injection Molding Processing Guide
| Drying Time | 2-6 hrs |
| Drying Temperature | 80-100℃ |
| Feed Zone Temperature | 150-180℃ |
| Center Zone Temperature | 170-190℃ |
| Front Zone Temperature | 180-200℃ |
| Nozzle Temperature | 180-200℃ |
| Melt Temperature | 200℃ |
| Mold Temperature | 20-40℃ |
| Injection Speed | Med |
These process conditions may vary with individual equipment and processes.
● Secondary Processing
As a thermoplastic material, Si-TPV material can be secondary processed for ordinary products
● Injection Molding Pressure
The holding pressure largely depends on the geometry, thickness and gate location of the product. The holding pressure should be set to a low value at first, and then slowly increase until no related defects are seen in the injection molded product. Due to the elastic properties of the material, excessive holding pressure may cause serious deformation of the gate part of the product.
● Back pressure
It is recommended that the back pressure when the screw is retracted should be 0.7-1.4Mpa, which will not only ensure the uniformity of melt melting, but also ensure that the material is not severely degraded by shear. The recommended screw speed of Si-TPV is 100-150rpm to ensure the complete melting and plasticization of the material without material degradation caused by shear heating.
Handling Precautions
A desiccant dehumidifying dryer is recommended for all drying.
Product safety information required for safe use is not included in this document. Before handling, read product and safety data sheets and container labels for safe use physical and health hazard information. The safety data sheet is available on the silike company website at siliketech.com, or from distributor, or by calling Silike customer service.
Usable Life And Storage
Transport as non-hazardous chemical.Store in a cool, well ventilated place. Original characteristics remain intact for 24 months from the production date, if kept in recommend storage.
Packaging Information
25KG / bag, craft paper bag with PE inner bag.
Limitations
This product is neither tested nor represented as suitable for medical or pharmaceutical uses.
Limited Warranty Information – Please Read Carefully
The information contained herein is offered in good faith and is believed to be accurate. However, because conditions and methods of use of our products are beyond our control, this information should not be used in substitution for customer’s tests to ensure that our products are safe, effective, and fully satisfactory for the intended end use. Suggestions of use shall not be taken as inducements to infringe any patent.
Related Solutions?
-
Soft Overmold Elastomer Solution for Durable Power & Hand Tool Grips
When using Si-TPV the design and development of handles for powered and non-powered tools and handheld products, not just appears to simply enhance the aesthetically pleasing of a device, adding a contrasting color or texture. Especially, Si-TPV overmolding's lightweight functionality also elevates ergonomics, deadens vibration, and improves a device' s grip and feel.
-
Non-Sticky Thermoplastic Elastomer for Indoor, Outdoor & Rcreational Sports Gear
Si-TPV for sporting gear and athletic goods over-molding will add the right "feel" to your product. These exciting materials solve your hardest problems and enable product design innovation to combine safety, aesthetics, product functionality, ergonomically, and eco-friendly.
-
Soft, Skin-Friendly Materials for 3C Electronic Products
Si-TPV is a skin-friendly, phthalate-free elastomer offering soft touch, durability, and overmolding compatibility—ideal for sustainable 3C electronics like phone cases, straps, and wearables.
-
Eco-Friendly Soft Elastomer for Baby & Kids Products Solution
Environmentally friendly alternatives to PVC & silicone or traditional plastics -- Si-TPV series, which allows manufacturers to create unique products, that are visually appealing, aesthetically, comfortable, ergonomic, and brightly colored, since without migration, have a non-stickiness surface, so it is more resistant to bacteria, dirt, and other contaminants than other materials, This makes it a novel solution for mothers and babies children products.
-
Soft Modified TPU Particles for Matte Finish on Film and Leather
SILIKE's Soft TPU Modifier Particles combine durability and flexibility, making them ideal for applications in sports gear like baseball, softball, and golf glove fabrics, as well as in films and leather. These particles improve hand feel without compromising comfort or dexterity, featuring a slip-resistant, non-sticky texture that enhances control in wet or slippery conditions. With a COF value > 3, they provide superior grip. Additionally, they serve as a functional matte additive for TPU, improving visual appeal, surface texture, and durability without the need for granulation or precipitation.
-
Si-TPV Soft-Touch Elastomer for Toys, Pet Products, and Coated Webbing
Compared to PVC, most soft TPU, and TPE, Si-TPV contains no plasticizers or softening oil. Bright solutions for you! aesthetics,skin-friendly, environmentally, soft touch over-molded, colorability on toys and consumer products. Don't contain any hazardous substances while offering enhanced durability from resistance to abrasion and stains.
-
Innovation in EVA Foam Materials: Si-TPV Modifier for Enhanced Performance and Sustainability
Si-TPV is introduced into the EVA foam material, and the chemical foaming technology is adopted to prepare the EVA foam material with the advantages of environmental protection and color saturation. Compared to OBC and other polyolefin elastomers, Si-TPV better effect, and can simultaneously improve the high and low-temperature compression deformation of hardness EVA foam materials, and the heat shrinkage rate of EVA foam material is reduced from 1.5% to 0.4%.
-
Si-TPV Polymer Modifier for Enhanced Durability & Soft-Touch TPU in EV Charging Cables and Hose
SILIKE Si-TPV 3100 Series is a dynamic vulcanizate silicone-based elastomer that acts as both a plastic additive and polymer modifier for TPU formulations. It enhances TPU performance by providing anti-scratch resistance, abrasion durability, and non-stick properties. Additionally, it improves the soft-touch feel and delivers a matte finish, making TPU more versatile for applications such as flexible shower hoses, automotive parts, and EV charging cables. This modifier enables manufacturers to achieve both aesthetic appeal and functionality, enhancing the durability and comfort of flexible components.
-
Si-TPV Modifiers for Enhanced Surface Smoothness and Durability in TPE
A new way for manufactured thermoplastic elastomers. Si-TPV is a novel modifier for TPE, engineered to improve surface smoothness, tactile feel, and overall durability. When blended with TPE, Si-TPV enhances the material's resistance to scratches and abrasion, while reducing hardness without compromising mechanical properties. The result is a soft-touch surface with superior aging resistance, yellowing resistance, and stain resistance. Additionally, Si-TPV contributes to a matte surface finish, making it the ideal solution for industries requiring high-performance elastomers with both functional and aesthetic advantages.