Si-TPV®3520-70A Thermoplastic Elastomer
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Si-TPV® 3520-70A Thermoplastic Elastomer is a soft touch, skin-friendly thermoplastic elastomer with excellent bonding to polycarbonate, ABS, and similar polar substrates.
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Applications
Solution for soft touch over molding on smart phones, portable electronic cases, smartwatch wristband, straps,and other wearable electronic devices.
Features & Benefits
- Soft silky feel
- Good scratch resistance
- Excellent bonding to PC, ABS
- Superhydrophobic
- Stain resistance
- UV stable
Description
SILIKE Si-TPV® thermoplastic elastomer is a patented dynamic vulcanized thermoplastic silicone-based elastomer which made by a special compatible technology to help silicone rubber dispersed in TPU evenly as a 2~3 micron particles under microscope. Those unique materials combine the strength, toughness and abrasion resistance of any thermoplastic elastomer with desirable properties of silicone: softness, silky feel, UV light and chemicals resistance which can be recycled and reused in traditional manufacturing processes.
Si-TPV® 3520-70A thermoplastic elastomer is a material with good abrasion and soft silky feel which can excellent bond to PC, ABS, TPU and similar polar substrates. It is a product developed for silky touch overmolding on wearable electronics, accessory cases for electronic devices,watch bands.
Typical Properties
| Test* | Property | Unit | Result |
| ISO 868 | Hardness (15 seconds) | Shore A | 71 |
| ISO 1183 | Specific Gravity | 1.11 | |
| ISO 1133 | Melt Flow Index 10 kg & 190℃ | g/10 min | 48 |
| ISO 37 | MOE ( Modulus of elasticity) | MPa | 6.4 |
| ISO 37 | Tensile Strength | MPa | 18 |
| ISO 37 | Tensile Stress @ 100% Elongation | MPa | 2.9 |
| ISO 37 | Elongation at break | % | 821 |
| ISO 34 | Tear Strength | kN/m | 55 |
| ISO 815 | Compression Set 22 hours @23℃ | % | 29 |
*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.
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