Leave a rubber band in a hot car glovebox for a summer and it cracks apart. A silicone hair tie survives the same heat without changing shape.
That gap in durability is the core of this comparison.
Rubber comes in two main families: natural rubber (latex), tapped from trees, and synthetic rubber, made in petrochemical plants. Silicone is a different material entirely, built on a silicon-oxygen backbone instead of carbon chains.
They feel similar in your hand. But under heat, UV light, or chemical exposure, silicone holds up far longer than most rubber compounds.
Rubber still wins on price, abrasion resistance, and raw stretch. This guide covers the 7 key differences so you can pick the right one for your specific use.
What Is Silicone?
Now let’s briefly go over silicone.
Silicone is also known as polysiloxane and comes from polymers.
Silicone is also recognized as an “elastomer”.
It’s characteristically colorless and can be very similar to rubber-like substances.
Silicone is used in many products like adhesives, lubricants, medicine, insulation, and household goods. Common forms include silicone grease, oil, resin, caulk, and rubber.
Silicone comes from high-performance materials like reactive salines, silicone fluids, and silicone polymers. These are used in everyday products and industrial goods.
In the early 1940s, the US researched the properties of silicone and also started to test it to help in the war.
General Electric got a government contract to make a cheap substitute for synthetic rubber during the war.
It was James Wright, an engineer at General Electrics from New Haven research laboratory who invented silly putty which is now developed in silicone.
The first silicone product was used on airplanes.
It was used as a paste so that they could protect electrical sparking equipment on the airplanes.
Silicone is made of oxygen, hydrogen, carbon, and silicon.
Note that silicon ingredient is not to be confused with silicone spelling.
Silicon is a chemical element that occurs naturally and silicone is a synthetic substance.
Silicone brings big benefits to healthcare, aerospace, construction, manufacturing, and transportation.
Other advantages for silicone vs rubber also include moisture and flexibility enhancement, cold, heat, and ultraviolet resistance.
Expert reviews on silicone state that it’s safe to use and they do not find it toxic, unlike other products.
The use of silicone is being widely used in the medical and health care industries.
For example, silicone is used in surgical and cosmetic body implants. These can increase the size of body parts like the butt, breasts, hips, and chin.
Silicone is often mass-produced in many forms for example solids, liquids, greases, oils, semi-viscous pastes, and rubber.
Properties of Silicone
There are various properties of silicone.
It has low thermal conductivity. That means heat moves through silicone very slowly, which helps protect whatever it touches.
Low chemical reactivity means that silicone contains the least reactive element and it doesn’t form a stable compound which is a huge advantage.
Silicone has low toxicity. There’s very little exposure to harmful elements when using it.
It’s safe for humans and the environment.
Silicone has strong thermal stability. It resists temperatures from -55 to 300 degrees C (-67 to 572 degrees F) and still works fine.
Silicone has the aptitude to resist water, in simple words, silicone is waterproof.
Silicone is not sticky.
Silicone does not grow micro parasitic which is a great advantage as there will be no fear of fungal microbes and bacteria.
Silicone has great resistance to oxygen, ozone, and ultraviolet (UV) light.
Silicone works as an electrical insulator. It’s suitable for a wide range of electrical products.
Silicone has high gas permeability. At 25 degrees C, it lets oxygen pass through about 400 times better than synthetic rubber.
This makes silicone great for medical uses where airflow matters.
Conversely, silicone rubbers can’t be used where gas-tight seals are necessary like seals for high-pressure gasses or high vacuum.
Silicone is often developed into rubber sheeting and is compliant with the U.S. Food and Drug Administration (FDA) law.
This extends the uses of silicone sheeting to industries that demand hygiene, for instance, pharmaceutical, food, and beverage industries.
Common Forms of Silicone
Some common forms include silicone oil, silicone rubber, silicone resin, silicone grease, and silicone caulk.
Silicone oils
Silicone oil is mainly used as a lubricant, thermic fluid oils, or hydraulic fluids.
They’re brilliant electrical insulators and are non-flammable.
Silicone oil temperature is very stable and it’s a good heat-transfer, making them commonly utilized in laboratories for heating baths or also known as oil baths.
Silicone oil is commonly used in wet-type transformers, diffusion pumps, and oil-filled heaters.
Silicone oil also shows up in aerospace engineering. It’s used in the coolant loop and radiators of the International Space Station Zvezda module.
That system dumps heat into the vacuum of space.
Silicone oil also indicates relatively high volatility, making it useful to use on cosmetic products like an antiperspirant.
Silicone oil is sometimes added to cooking oils so that excessive foaming can be reduced or stopped when deep frying.
Silicone oil is produced mainly with two main ingredients which are silly putty and boric acid.
Silicone Rubber
Silicone rubber is an elastomer. It feels like a rubber solid and is made from silicone.
It contains silicon (not the same spelling), hydrogen, oxygen, and carbon.
Silicone rubbers are broadly used in the industry world and multiple extremely useful products have been created with the use of silicone rubber.
Sometimes silicone rubber may contain fillers so that cost can be reduced and also to improve its properties.
Silicone rubber shows up in footwear, sportswear, undergarments, electronics, medical implants, and sealants.
Silicone Resin
Silicone resins are more often used as resins.
Silicone resin has enormous heat resistance, weatherability, nonconductor properties and is waterproof once dried.
Silicone resin is mostly available in liquid forms but note, there are also solid forms to resin which is a little bit rare.
Silicone resins are mostly used to make paints and also coatings.
They are mainly used in a wide variety of products so that it can help to improve the durability, consistency and safety of the products.
Silicone Grease
Silicone grease also known as silicone lubricants are liquids products.
Silicone grease is widely used to lubricate fountain pen filling.
Silicone grease also seals and preserves products like waterproof watches and air rifles. Even plumbers use it.
It’s also used to lubricate and seal water-submersible flashlights which is a product that is necessary for diving and spearfishing.
Silicone grease is used with waterproof devices, and it’s very thick hence it doesn’t dissolve in water.
Silicone Caulk
Silicone caulk is used for various household uses, for instance, lubricating shower heads, door hinges, garden hose threads, etc.
Silicone caulk works like a glue gun tube. It seals and fixes plumbing issues in bathtubs, toilets, sinks, and showers.
As you may note, the examples mentioned above are mainly where there is the use of water hence proving that silicone is a waterproof product.
Silicone caulk is known for its excellence in weatherproofing houses.
The use of silicone caulk is highly durable and easy to use.
Uses of Silicone
Silicone is utilized for multiple purposes.
Find some examples of where it’s used below.
Aviation
Silicone can resist extreme temperatures.
Silicone adhesives and sealants protect airplane doors, windows, wings, and fuel tanks. They’re also used on hydraulic switches, overhead bins, vent ducts, engine gaskets, electrical wires, and black boxes.
Personal care and hygiene products
Silicone is used in personal care goods to diminish the white residue and sticky feel of antiperspirants in deodorizers.
Silicone is also in cosmetics, shampoos, and conditioners. It helps hold color and shine longer.
It also boosts SPF in lotions.
Silicone provides smoothness and helps in an even application of all liquid cosmetics products.
Energy
Silicone improves the performance and durability of solar panels. It makes them more cost-effective and helps them last for years in the sun.
Thus, silicone is considered to be the ideal material for solar panels and photovoltaic.
Electronics
Keyboards, keypads, and copier rollers are produced with solid and durable silicone.
Many components from computers, mobile electronics, and home equipment also utilize silicone.
Silicone is also used in enabling LED lighting technology.
What Is Rubber?
As mentioned earlier in silicone vs rubber, there are two types of rubber namely, natural rubber and synthetic rubber.
Natural rubber is a product of the Rubber Tree and one source of rubber is theHevea which is normally grown in the rain forest of South America.
A white sap is collected from the trees and processed for different outcomes.
This white sap, called latex, flows out through long cuts on the bark. It’s collected in pots and left to dry so the watery liquid separates out.
Only then is the latex given different forms.
Long ago rubber was made only from natural sources but fortunately, today rubber can also be made artificially, known as Synthetic Rubber.
Without synthetic rubber, our daily use would have drained natural sources. Those sources are vital for the environment.
World War II disrupted natural rubber supply. The U.S. government started looking for ways to produce rubber faster and at larger scale.
The growing number of vehicles with pneumatic tires also drove demand higher.
Fritz Hofmann and his team, working at the Bayer Laboratory in Elberfeld Germany, succeeded in producing the first Synthetic Rubber.
Synthetic rubber, made from petrochemicals, was a huge win for science and engineering. It gave the world a real substitute for natural rubber.
Properties of Rubber
In our everyday life, we use rubber in many different forms and different purposes.
That tells you rubber has a huge variety of properties. Those properties make it valuable for everyday use.
Elasticity is rubber’s best-known property. It can stretch to long lengths and snap back to its original shape.
Different types of rubber stretch to different degrees.
A rubber band is a perfect example. Stretch it out and it snaps right back.
It holds up even after you repeat this many times.
Heat contraction is another interesting trait. Most materials expand when heated.
Rubber does the opposite and contracts. This happens because of how its molecules are bonded.
Rubber also acts as an electrical insulator. Its electrons are tightly grouped and don’t pass freely between atoms.
More properties of rubber are toughness, flexibility, tear-resistant, abrasion-resistant, compression set, and impermeable to water.
Common Forms of Rubber
Rubber is used everywhere in daily life. Several types exist: natural rubber, neoprene rubber, silicone rubber, nitrile rubber, and more.
Natural Rubber
Natural rubber, which is reputed for its durability and resistance to very high heat.
The properties of natural rubber enable it to be used in many products such as tires, gloves, foam rubber, insulation, and adhesives.
Neoprene Rubber
Neoprene rubber is a synthetic rubber.
It resists degrading, corrosion, and burning better than most rubbers. That’s why it’s used for corrosion-resistant coatings, gaskets, belts, and adhesives.
Since it’s impermeable by water, it’s also used for aquatic clothing, gear, and equipment.
Silicone Rubber
Silicone rubber, also known as polysiloxane and is highly resistant to very high temperatures, UV rays, ozone, and open fire.
Silicone rubber is very flexible and comes in many colors, in solid or liquid form. Most importantly, it doesn’t react to most chemicals.
Due to this inertness characteristic, silicone rubber is both hypoallergenic and biocompatible.
Nitrile Rubber
Having the properties of resistance to heat, gas permeability, and oil, the nitrile rubber is widely used in the automobile, aviation and aerospace industry.
Nitrile rubber is also used for heavy-duty protective gloves, molded goods, floor mats, footwear, and sponges, because of its durability and resistance.
Uses of Rubber
Rubber is in elastic bands and erasers, but it’s also all around us. We barely notice it, but rubber shows up in household products and industrial goods alike.
Tire
One of the most common uses of rubber is for the tire of different means of transport such as bicycle, motorcycle, car, lorries, and even airplanes.
Rubber is ideal for tires thanks to its elasticity and traction. These properties give tires better grip, even on wet roads.
Shoes
Rubber shoes are quite common in the industrial field mainly due to the characteristic of rubber being durable, impermeable to water, insulator, and so on.
Rubber shoes protect from falling objects and give better grip while walking. They also shield feet from high temperatures.
Basement flooring
Rubber works great for basement flooring. It’s waterproof, heat-resistant, durable, and elastic.
Basement flooring made of rubber is also highly resistant to impact, and that’s why they are mostly used in gyms and weight rooms.
Window wipers
The windshield of vehicles is quite a delicate area, and it’s very important to always keep it clean.
Here again, the characteristic of rubber enables us to keep our windshields clean.
Rubber is tough enough to remove dirt from the glass. But it’s also soft enough to avoid scratching the surface.
The heat resistance capacity of rubber allows it to be durable even though it stays in contact with the sun rays.
What Is the Difference Between Silicone vs Rubber?
Rubber and silicone both get classified as elastomers, which is chemistry-speak for stretchy polymer materials.
The core structural split sits at the backbone of each molecule. Most rubber forms rely on carbon-carbon bonds.
Silicone’s chain is built from alternating silicon and oxygen atoms, with hydrogen and carbon hanging off the sides.
That silicon-oxygen backbone is why silicone laughs off things that eat rubber alive: UV light, ozone, heat cycles, and long-term oxidation.
Rubber wins the raw stretch contest, though. A rubber band can triple its resting length and snap back.
Silicone has less give before it tears, which is why rubber still dominates the rubber band and balloon aisles.
Here’s the thing: rubber starts aging the day it leaves the factory. Pressure, heat swings, and UV exposure all chip away at the polymer, causing color shift, hardening, and cracking within a year or two of heavy use.
Silicone typically outlasts rubber by roughly four times in the same conditions, sometimes more if the rubber is sitting in direct sun.
Silicone costs more up front, no question. But the longer working life usually pencils out cheaper than replacing rubber parts every season.
Rubber production leans on a stew of stabilizers and accelerators to hit commercial specs. Some of those additives are mildly toxic, which is one reason rubber isn’t trusted in food-contact roles.
Silicone is manufactured with far fewer reactive additives, which is how it ended up with food-grade, medical-grade, and baby-safe certifications across the board.
Food processing plants lean silicone for the same reason. It survives continuous pressure, heat, and cleaning cycles without leaching anything the FDA doesn’t want in your sandwich.
Silicone also carries a much lower contamination risk because its surface doesn’t support microbial growth the way porous natural rubber does.
On hygiene alone, silicone leaves rubber in the dust.
Natural rubber tears relatively easily under a sharp pull. Silicone carries a higher tear strength pound-for-pound in most modern formulations.
Silicone stays stable up to roughly 230 degrees Celsius, which is why it handles flames, ovens, and hot manifold runs that would melt a rubber equivalent.
So which one wins?
Frequently Asked Questions
Is silicone technically a type of rubber or its own material?
Silicone sits in a grey area. Chemically it’s classified as an elastomer like rubber, but its backbone is built from silicon and oxygen instead of carbon-to-carbon bonds.
That structural difference is why silicone handles heat, UV, and ozone far better than organic rubber while still delivering similar flexibility and stretch.
Why does rubber crack and yellow while silicone stays smooth?
The carbon bonds in rubber break down when they meet oxygen, ozone, and UV light, causing the cracking, hardening, and yellow tint you see on old rubber bands or tires left in the sun. Silicone’s silicon-oxygen backbone resists those same forces, which is why silicone gaskets and sealants stay flexible for decades outdoors.
Which one handles motor oil and fuel better, silicone or rubber?
Rubber, specifically nitrile rubber, wins this round. Silicone swells and softens when it meets petroleum products, so engine gaskets and fuel lines are almost always nitrile rubber.
This is the one major application where rubber clearly outperforms silicone, so never substitute silicone hoses on any line that carries oil or fuel.
Is silicone food-safe in ways that rubber isn’t?
Generally yes. Food-grade silicone is inert, doesn’t leach flavors, and handles oven, freezer, and dishwasher cycles without breaking down.
Rubber can impart a taste to foods and degrades faster under heat, which is why modern bakeware, spatulas, bottle nipples, and ice molds have largely shifted to silicone in recent years.
Can I use silicone hoses in a place that originally called for rubber?
Usually yes, as long as there’s no oil or fuel involved. Silicone hoses are a popular upgrade on radiator and intercooler plumbing because they handle heat swings without cracking.
Just make sure to match the inside diameter and use proper hose clamps, since silicone is slightly slipperier than rubber on barb fittings.
Final Thoughts
Silicone wins most modern head-to-heads with rubber, but “most” is not “all,” and the smart play is matching the material to whatever stress the part is going to take.
Home cooks, bakers, and parents of young kids should lean silicone almost without thinking. Silicone bakeware, spatulas, bottle nipples, and ice molds all handle the dishwasher, oven, and freezer without hardening or leaching weird flavors.
Car enthusiasts and DIY mechanics should split the difference. Silicone coolant hoses are the go-to upgrade because they shrug off engine bay heat swings, but fuel lines, oil lines, and power steering hoses stay rubber since silicone swells the second petroleum touches it.
Rubber still earns its keep where stretch, bounce, grip, and low price matter more than heat resistance: rubber bands, pencil erasers, tires, and gym flooring. For almost any job that sees the sun, the stove, or the oven, silicone is the longer-lasting answer every time.
