Smart bracelet material selection revealed

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As the saying goes: steel watches with steel bands, gold watches with gold bands, what should smart watches and smart bracelets be matched with? In recent years, the smart wearable market demand has been expanding, according to the latest CCS Insights data report shows that in 2020, the shipment of smart watches is 115 million, and the shipment of smart bracelets is 0.78 billion.

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Sizable market prospects make a lot of domestic electronic manufacturers have joined the smart wearable device industry, a variety of materials such as silicone, TPU, TPE, fluoroelastomer, and TPSIV and other materials are endless, each of them has outstanding characteristics at the same time, there are also the following shortcomings:
Silicone material: need to be sprayed, spraying surface is easy to be damaged to affect the touch, easy to stain the gray, short service life, low tear strength, while the production cycle is longer, the waste can not be recycled, and so on;
TPU material: strong plasticity (high hardness, low temperature hardness) easy to break, poor UV resistance, poor yellowing resistance, difficult to remove the mold, long molding cycle;

TPE material: poor dirt resistance, rapid decline in physical properties as the temperature rises, easy precipitation of oil-filled, plastic deformation increases;

Fluoroelastomer: surface spraying process is difficult to operate, affecting the feel of the substrate and the coating contains organic solvents, the coating is easy to wear and tear off, dirt resistance with the destruction of the coating deterioration, expensive, heavy, etc.;

TPSIV material: no spraying, high body feeling, anti-yellowing, low hardness, injection molding and other advantages, but lower strength, high cost, unable to meet the material requirements of smart watches, etc.

Si-TPV silicone-based thermoplastic elastomer materials take into account several aspects of performance, efficiency and comprehensive cost, with high efficiency, high quality and high cost-effective advantages, effectively overcoming the shortcomings of mainstream materials in actual production and use, and is superior to TPSIV in terms of high bodyfeel, stain resistance and high strength.

1. Delicate, soft and skin-friendly touch feeling

Smart wear as the name suggests is a long-term direct contact with the human body of smart products, watch bands, bracelets in the process of long-term wear of comfortable touch is very important, delicate, soft, skin-friendly is the selection of the material to bear the brunt of the concern. Si-TPV Silicone elastomers material has excellent delicate soft skin-friendly touch, without secondary processing, to avoid the coating brought about by the cumbersome processing procedures as well as the coating fall off impact on the sense of touch.

2. Dirt-resistant and easy to clean

Smart watches, bracelets, mechanical watches, etc. use metal as the strap, which often adheres to stains during long-term wear and is difficult to wipe clean, thus affecting the aesthetics and service life. Si-TPV Silicone elastomers material has good dirt resistance, easy to clean, and no risk of precipitation and adhesion during long-term use.

3. Easy coloring, rich color options Si-TPV series elastomer material passes the color fastness test, easy to color, can be two-color or multi-color injection molding, rich color choices to meet the trend of smart wear, personalized. To a large extent, it gives consumers more choices and increases their desire to buy.
4. Bio-insensitive, safe and environmentally friendly Safety is one of the key elements of smart wear, Si-TPV series elastomer material is biologically non-allergenic and has passed skin irritation test, food contact standards, etc., which effectively ensures the safety of long-term wear. In addition, there is no need to add any harmful solvents and plasticizers in production, and after molding, it is odorless and non-volatile, featuring low carbon emission, low VOC, and recyclable for secondary use.

Application

Si-TPV Modified silicone elastomer/Soft elastic material/soft overmolded material is an innovative approach for manufacturers of smart watch bands and bracelets that require unique ergonomic designs as well as safety and durability. It is an innovative approach for manufacturers of smart bands and bracelets that require unique ergonomic design as well as safety and durability. In addition, it is also widely used as a replacement for TPU coated webbing, TPU belts and other applications.

Overmolding Guide

Overmolding recommendations
Substrate Material	Overmold Grades	Typical Applications
Polypropylene (PP)	Si-TPV 2150 Series	Sport Grips, Leisure Handles,Wearable Devices Knobs Personal Care- Toothbrushes, Razors, Pens, Power & Hand Tool Handles, Grips, Caster Wheels，Toys
Polyethylene (PE)	Si-TPV3420 Series	Gym Gear, Eyewear, Toothbrush Handles,Cosmetic Packaging
Polycarbonate (PC)	Si-TPV3100 Series	Sporting Goods, Wearable Wristbands, Handheld Electronics, Business Equipment Housings, Healthcare Devices, Hand and Power Tools, Telecommunications and Business Machines
Acrylonitrile Butadiene Styrene (ABS)	Si-TPV2250 Series	Sports & Leisure equipment, Wearable Devices, Housewares, Toys, Portable Electronics, Grips, Handles, Knobs
PC/ABS	Si-TPV3525 Series	Sports Gear, Outdoor Equipment,Housewares, Toys, Portable Electronics, Grips, Handles, Knobs, Hand and Power Tools, Telecommunications and Business Machines
Standard and Modified Nylon 6, Nylon 6/6, Nylon 6,6,6 PA	Si-TPV3520 Series	Fitness Goods, Protective Gear, Outdoor Hiking Trekking Equipments, Eyewear, Toothbrush Handles, Hardware, Lawn and Garden Tools, Power Tools

Bond Requirements

SILIKE Si-TPVs Overmolding can adhere to other materials through injection molding. suitable for insert molding and or multiple material molding. Multiple material molding is otherwise known as Multi-shot injection molding, Two-Shot Molding, or 2K molding.

SI-TPVs have excellent adhesion to a variety of thermoplastics, from polypropylene and polyethylene to all kinds of engineering plastics.

When selecting an Si-TPV for an over-molding application, the substrate type should be considered. Not all Si-TPVs will bond to all types of substrates.

For more information regarding specific over-molding Si-TPVs and their corresponding substrate materials, please feel contact us.

Key Benefits

01

Long-term soft skin-friendly comfort touch does not require additional processing or coating steps.
02

Stain-resistant, resistant to dust accumulated, resistant against sweat and sebum, retaining the aesthetic appeal.
03

Further surface durable scratch & abrasion resistance, waterproof, resistance to weather, UV light, and chemicals.
04

Further surface durable scratch & abrasion resistance, waterproof, resistance to weather, UV light, and chemicals.
05

Si-TPV creates a superior bond with the substrate, it is not easy to peel off.

Durability Sustainability

Advanced solvent-free technology, without plasticizer, no softening oil, and odorless.
Environmental protection and recyclability.
Available in regulatory-compliant formulations

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