Rubber Bracelet Beads

More On Rubber Bracelet
More on Rubber Bracelet Beaads

Make a statement with these gorgeous rubber bracelet beads , high quality and easy to clean colored chewing beads, ideal as sensory beads. These eye catching chewing sensory beads are the flare you've been after with a premium promise: no fading in the sun and safe to use for chewelry dyi items, as they are made of 100% silicone.

Accessorize in style with our rubber bracelet beads! They come in a variety of colors and shapes, ensuring you have an easy DIY project with a beautiful final piece. Be sure to check out our DIY tutorials so that you can craft easily!

These silicone beads are made of high-quality silicone, safe and odorless, non-toxic, durable, not easy to fade or deform. They can be used not only for bracelets but also for other projects:

• Can be widely applied to make various crafts; such as chewing beads necklaces or bracelets, sensory beads keychains or lanyards.
• These silicone beads will not fade or wear out after a long time of use, and the silicone beads can be washed directly with water, making them easy to carry.
• The colorful rubber bracelet beads can be used to make jewelry accessories or other exquisite handicrafts with your friends and family.

Our selected rubber bracelet beads are made of high-quality silicone, which has strength, non-toxicity, no peculiar smell , is safe smooth and comfortable easy to clean.. It is also safe, smooth and comfortable and easy to clean. Enjoy the fun of handmade DIY art games with your family and friends,and while staying away from electronic devices,you can also give full play to your imagination and get a certain sense of satisfaction.

Choose from a wide range of rubber bracelet beads styles to reflect your style. Encourages parents, or families to work together as a team to make each piece truly one-of-a-kind. The rubber bracelet beads includes a variety of eye-catching colors and unique designs that make your creations stand out.

This collection contains crazy, unique, eye-catching beads and charms from top quality silicone. Clever Beads stands for Top Quality and is food grade silicone. You can make the most beautiful bracelets with these cute and fancy silicone rubber bracelet beads. Add some of these amazing rubber bracelet beads Clever Beads and charms to your jewelry and create an extraordinary look!

Rubber Bracelet Beads - Interesting Facts about Silicone Rubber

Silicone rubber is an elastomer (rubber-like material) composed of silicone—itself a polymer—containing silicon together with carbon, hydrogen, and oxygen. Silicone rubbers are widely used in industry, and there are multiple formulations. Silicone rubbers are often one- or two-part polymers, and may contain fillers to improve properties or reduce cost. Silicone rubber is generally non-reactive, stable, and resistant to extreme environments and temperatures from −55 to 300 °C (−70 to 570 °F) while still maintaining its useful properties. Due to these properties and its ease of manufacturing and shaping, silicone rubber can be found in a wide variety of products, including voltage line insulators; automotive applications; cooking, baking, and food storage products; apparel such as undergarments, sportswear, and footwear; electronics; medical devices and implants; and in home repair and hardware, in products such as silicone sealants.

In its uncured state, silicone rubber is a highly adhesive gel or liquid. To convert it to a solid, it must be cured, vulcanized, or catalyzed. This is normally carried out in a two-stage process at the point of manufacture into the desired shape, and then in a prolonged post-cure process. It can also be injection molded or 3D printed.

Silicone rubber may be cured by a platinum-catalyzed cure system, a condensation cure system, a peroxide cure system, or an oxime cure system. For the platinum-catalyzed cure system, the curing process can be accelerated by adding heat or pressure.

-Platinum-based cure system In a platinum-based silicone cure system, also called an addition system (because the key reaction-building polymer is an addition reaction), a hydride- and a vinyl-functional siloxane polymer react in the presence of a platinum complex catalyst, creating an ethyl bridge between the two. The reaction has no byproducts. Such silicone rubbers cure quickly, though the rate of or even ability to cure is easily inhibited in the presence of elemental tin, sulfur, and many amine compounds.

Condensation curing systems can be one-part or two-part systems. In one-part or RTV (room-temperature vulcanizing) system, a cross-linker exposed to ambient humidity (i.e., water) experiences a hydrolysis step and is left with a hydroxyl or silanol group. The silanol condenses further with another hydrolyzable group on the polymer or cross-linker and continues until the system is fully cured. Such a system will cure on its own at room temperature and (unlike the platinum-based addition cure system) is not easily inhibited by contact with other chemicals, though the process may be affected by contact with some plastics or metals and may not take place at all if placed in contact with already-cured silicone compounds. The crosslinkers used in condensation cure systems are typically alkoxy, acetoxy, ester, enoxy or oxime silanes such as methyl trimethoxy silane for alkoxy-curing systems and methyl triacetoxysilane for acetoxy-curing systems. In many cases an additional condensation catalyst is added to fully cure the RTV system and achieve a tack-free surface. Organotitanate catalysts such as tetraalkoxy titanates or chelated titanates are used in alkoxy-cured systems. Tin catalysts such as dibutyl tin dilaurate (DBTDL) can be used in oxime and acetoxy-cured systems. Acetoxy tin condensation is one of the oldest cure chemistries used for curing silicone rubber, and is the one used in household bathroom caulk. Depending on the type of detached molecule, it is possible to classify silicone systems as acidic, neutral or alkaline.

Overview of the most commonly used silicone systems:

Two-part condensation systems package the cross-linker and condensation catalyst together in one part while the polymer and any fillers or pigments are in the second part. Mixing of the two parts causes the curing to take place. A typical filler is fumed silica, also known as pyrogenic silica, which used to control the flow properties of the sealant.

Once fully cured, condensation systems are effective as sealants and caulks in plumbing and building construction and as molds for casting polyurethane, epoxy and polyester resins, waxes, gypsum, and low-melting-temperature metals such as lead. They are typically very flexible and have a high tear strength. They do not require the use of a release agent since silicones have non-stick properties.

Peroxide cure system - Peroxide curing is widely used for curing silicone rubber. The curing process leaves behind byproducts, which can be an issue in food contact and medical applications. However, these products are usually treated in a postcure oven which greatly reduces the peroxide breakdown product content. One of the two main organic peroxides used, dicumyl peroxide (compare cumene hydroperoxide), has principal breakdown products of acetophenone and phenyl-2-propanol. The other is dichlorobenzoyl peroxide, whose principal breakdown products are dichlorobenzoic acid and dichlorobenzene.

Crosslinking by organic peroxides

History of silicone , the material used to make silcone rubber bracelet beads

The first silicone elastomers were developed in the search for better insulating materials for electric motors and generators. Resin-impregnated glass fibers were the state-of-the-art materials at the time. The glass was very heat resistant, but the phenolic resins would not withstand the higher temperatures that were being encountered in new smaller electric motors. Chemists at Corning Glass and General Electric were investigating heat-resistant materials for use as resinous binders when they synthesized the first silicone polymers, demonstrated that they worked well and found a route to produce them commercially.

The term "silicone" is actually a misnomer. The suffix -one is used by chemists to denote a substance with a double-bonded atom of oxygen in its backbone. When first discovered, silicone was erroneously believed to have oxygen atoms bonded in this way. The technically correct term for the various silicone rubbers is polysiloxanes (polydimethylsiloxanes being a large subset), referring to a saturated Si-O backbone.

Corning Glass in a joint venture with Dow Chemical formed Dow Corning in 1943 to produce this new class of materials. As the unique properties of the new silicone products were studied in more detail, their potential for broader usage was envisioned, and GE opened its own plant to produce silicones in 1947. GE Silicones was sold to Momentive Performance Materials in 2006. Wacker Chemie also started production of silicones in Europe in 1947. The Japanese company Shin-Etsu Chemical began mass production of silicone in 1953.

Properties

Silicone rubber offers good resistance to extreme temperatures, being able to operate normally from −100 to 300 °C (−150 to 570 °F). Silicone rubber has low tensile strength, poor wear and tear wear properties.[8] Some properties such as elongation, creep, cyclic flexing, tear strength, compression set, dielectric strength (at high voltage), thermal conductivity, fire resistance and in some cases tensile strength can be—at extreme temperatures—far superior to organic rubbers in general, although a few of these properties are still lower than for some specialty materials. Silicone rubber is a material of choice in industry when retention of initial shape and mechanical strength are desired under heavy thermal stress or sub-zero temperatures.

Compared to organic rubber

Organic rubber has a carbon-to-carbon backbone which can leave it susceptible to ozone, UV, heat and other aging factors that silicone rubber can withstand well. This makes silicone rubber one of the elastomers of choice in many extreme environments. Silicone is considerably more permeable to gasses than most other rubbers which limits its use in some areas.

Silicone rubber is highly inert and does not react with most chemicals and isn’t available to participate in biological processes allowing it to be used in many medical applications including medical implants. It is biocompatible, hypoallergenic, which makes it suitable for baby care products, and food contact in general. Silicone rubber is a reliable solution (as opposed to rubber and thermoplastic elastomers) for migration or interaction problems between the main active ingredients. Its chemical stability prevents it from affecting any substrate it is in contact with (skin, water, blood, active ingredients, etc.)

•     Hardness, Shore A   25–90
•     Tensile failure stress, ultimate        1,400–10,300 kPa (200–1,500 psi)
•     Elongation after fracture in %         ≥ 700% maximum
•     Density        Can be compounded from 0.95 to over 1.20 g/cm3

Production

To make silicone, the silicon atoms must be isolated from the silicon dioxide compound silica. This is done by heating large volumes of quartz sand to extremely high temperatures, often up to 1800 °C. From here, there are several processes where silicon is combined with methyl chloride and heated. It is then distilled into a polymerised siloxane known as polydimethylsiloxane. The polydimethylsiloxane can then be polymerised. This is done using a variety of techniques depending on the use of the final product.[13] The raw silicone compound is combined with any desired additives, which may include pigments, and the catalyst. It is then injection moulded, extruded or 3D printed. Curing is the final stage in the production process.

Structure

Silicone rubber chain

Repeat unit of silicone rubber

Polysiloxanes differ from other polymers in that their backbones consist of Si–O–Si units instead of C–C units. The large bond angles and bond lengths make polysiloxanes more flexible than basic polymers such as polyethylene. A C–C backbone unit has a bond length of 1.54 Å and a bond angle of 112°, whereas an Si–O backbone unit has a bond length of 1.63 Å and a bond angle of 130°. Polymer segments in polysiloxanes can move farther and change conformation easily, making for a flexible material. Polysiloxanes tend to be more stable and less chemically active because more energy is required to break the silicon-oxygen bond. Although silicon is a congener of carbon, having the same electron bonding configuration, silicon analogues of carbonaceous compounds generally exhibit different properties. The difference in total charge and mass between carbon with 6 protons and 6 neutrons, and silicon with 14 protons and 14 neutrons causes an added layer of electrons and their screening effect changes the electronegativity between the two elements. For example the silicon-oxygen bond in polysiloxanes is significantly more stable than the carbon-oxygen bond in polyoxymethylene, a structurally similar polymer. The difference is partly due to the higher bond energy, the energy required to break the Si-O bond, and also because polyoxymethylene decomposes formaldehyde, which is volatile and escapes driving decomposition forward, but Si-containing decomposition products of silicone are less volatile.

Mechanical properties        (Polymax 2005)[citation needed]

•     Hardness, shore A   10–90
•     Tensile strength       11 N/mm2
•     Elongation at break 100–1100 %
•     Maximum temperature       300 °C
•     Minimum temperature       −120 °C

Special grades

There are many special grades and forms of silicone rubber, including: steam resistant, metal detectable, high tear strength, extreme high temperature, extreme low temperature, electrically conductive, chemical/oil/acid/gas resistant, low smoke emitting, and flame-retardant. A variety of fillers can be used in silicone rubber, although most are non-reinforcing and lower the tensile strength.

Silicone rubber is available in a range of hardness levels, expressed as Shore A or IRHD between 10 and 100, the higher number being the harder compound. It is also available in virtually any colour, and can be colour matched.

 

Applications

Silicone rubber is used in automotive applications, many cooking, baking, and food storage products, apparel including undergarments, sportswear, and footwear, electronics, to home repair and hardware, and a host of unseen applications. It is usually processed and shaped with the following methods.

Once mixed and coloured, silicone rubber can be extruded into tubes, strips, solid cord or custom profiles according to the size specifications of the manufacturer. Cord can be joined to make O-rings and extruded profiles can be joined to make seals.

Injection moulding

Silicone rubber can be moulded into custom shapes and designs. Manufacturers work to set industry tolerances when extruding, cutting or joining silicone rubber profiles. In the UK this is BS 3734, for extrusions the tightest level is E1 and the widest is E3.

3D printing

Silicone 3d print with support material

Silicone 3d print with support material

Silicone rubber can be 3d printed (liquid deposition modelling LDM) using pump-nozzle extrusion systems. Unfortunately, standard silicone formulations are optimized to be used by extrusion and injection moulding machines and are not applicable in LDM-based 3D printing. The rheological behavior and the pot life need to be adjusted.

3D printing also requires the use of a removable support material that is compatible with the silicone rubber.

Liquid silicone rubber is also manufactured for life science applications (syringe pistons, closure for dispensing system, gaskets for IV flow regulator, respiratory masks, implantable chambers for IV administration), cosmetic products (Mascara brush, make-up packaging, make-up applicator and lipstick moulds) and optics products (circular lens, collimators, Fresnel lenses and free form lenses).

Freeze-tolerant solar water-heating panels exploit the elasticity of silicone to repeatedly accommodate the expansion of water on freezing, while its extreme temperature tolerance maintain a lack of brittleness below freezing and excellent tolerance of temperatures in excess of 150 °C (300 °F). Its property of not having a carbon backbone, but a chemically robust silicon backbone instead, reduces its potential as a food source for dangerous waterborne bacteria such as Legionella.

Non-dyed silicone rubber tape with an iron(III) oxide additive (making the tape a red-orange colour) is used extensively in aviation and aerospace wiring applications as a splice or wrapping tape due to its non-flammable nature. The iron oxide additive adds high thermal conductivity but does not change the high electrical insulation property of the silicone rubber. This type of self-amalgamating tape amalgamates or fuses to itself, so that when stretched and wrapped around cables, electrical joints, hoses and pipes it bonds into a strong seamless rubbery electrically insulating and waterproof layer, although not adhesive. As an electrical insulator, silicone rubber has the added virtue of remaining non-conductive when damaged by heat, reducing the likelihood of runaway arcing.

With the addition of carbon or another conductive substance as a powdered filler, silicone rubber can be made electrically conductive while retaining most of its other mechanical properties. As such it is used for flexible contacts which close on being pressed, used in many devices such as computer keyboards and remote control handsets.

Electrical insulation

Silicone rubber is used as an electrical insulator in power cables and cable joints. Silicone-insulated cables are advantageous in that they can withstand temperatures from -90°C to 200°C, and are highly flexible. These properties make them suitable for maintaining circuit integrity in the event of a fire.

Self-healing

In 2007, silicone rubber formed the matrix of the first autonomic self-healing elastomer.[19] The microcapsule-based material was capable of recovering almost all of the original tear strength. Additionally, this material had improved fatigue properties as evaluated using a torsion-fatigue test.

Soft Rubber Beads - What makes them soft

The softness of the rubber bracelet beads is due to the material they are made of, which is silicone.

Flat rubber beads

Discover our flat rubber beads selection: flower beads, spotted cow, animals and many other flat rubber beads.

Silicone Beads Bracelets DIY - Interesting facts about bracelets

Bracelets are among the most popular pieces of jewellery worn by men and women. This has been true for thousands of years. The first bracelets dating back to approximately 2500 BC were found by archaeologists. The first bracelets that were known were worn by people from southern Mesopotamia. Sumerian women were made into showcases of their husband's prosperity by wearing jewellery, not just bracelets but anklets, necklaces, earrings, and finger rings. Bracelets were found in the tombs of people from the city of Ur. It was customary for royalty to have their jewellery and servants with them in the afterlife.

Bracelets were also important in Ancient Egypt. Charm bracelets were first used during the Pharaonic period. Charms date back to the Neolithic age. Men would carry wood or stone about their bodies to ward off enemies. These charms were powerful protectors against harmful events. It wasn't until Ancient Egypt that these charms were incorporated into elaborate jewellery such as bracelets and necklaces, which were seen as a sign of how wealthy the person had been. The Gods of this person's afterlife would be able to see these jewellery pieces and understand the person’s correct status.

Then, in Grecian times bracelets became popular among men. Soldiers wore leather bands on their forearms to protect against opponents’ weapons. Often decorated with silver and gold, sometimes with gemstones. They were known as ‘Bracels,’ from the Latin Brachium, meaning, ‘arm.’ When women realised that these Bracels would look great on their arms, they started wearing more delicate versions, called little Bracels...or ‘Bracel-ets.’

After the destruction of Pompeii by the eruption of the volcano Vesuvius in 79 AD, bracelets were hidden in the ruins. They were not uncovered until the 19th century by modern archaeologists.During the Roman era, engraved bangles and snake bracelets were particularly fashionable. Bracelets consisting of twisted metal coils with lion head ends, as well as two-part bracelets with a pair of lion heads, were popular.

In Roman bracelets, stones and glass were frequently utilised. Gemstones were commonly found in people’s eyes or animals depicted on jewellery. Open bands intertwined with pearls were carved to imitate a row of ivy. Many of the leaf and berry bracelets had a lot of beautiful glass set into them. Bracelets stacked with bezel set emeralds were prevalent on the wealthiest women.

End of categ Rubber Bracelet Beads