As a manufacturer, choosing between latex and silicone material involves some considerations. When you choose the wrong material, your end material properties and usage are automatically compromised. Since this process requires a thorough understanding of these two materials to make a better choice, we gathered this article from our years of industry experience to give you guidance in choosing between silicone and latex.

Latex vs Silicone: Meaning 

Understanding Latex

Latex material is a natural fluid found in plants. It’s usually made from rubber trees, and it comes with the composition of a unique material that gives latex its actual properties. Here are some of the materials:

• Rubber Particles: One latex primary component is rubber. The rubber particles feature polyisoprene ( a polymer that gives latex its rubber-like composition.
• Water: Water is another primary component of latex. Water makes it possible for latex to have its form, and it also works as a solvent for other latex material particles.
• Proteins: The type of protein a latex material exhibits is based on the latex type and concentration. They play a crucial role in latex, they are also the cause of allergic reactions in latex material. Remember, these proteins are not the types you eat.
• Alkaloids: You might find a bit of alkaloids in some latex materials, it’s usually based on the types you get and they are effective in different ways.
• Sugar: Glucose, fructose, and other natural rubber come naturally into latex from the rubber tree itself. The purpose of these natural rubbers is to help the latex material form its material composition.

Understanding Silicone

Unlike latex which occurs naturally, silicone is a synthetic polymer that doesn’t occur naturally. Although its elements occur naturally, silicone is a bit made by man. With the above explanation, you should have known that silicone is different from latex. You need to combine a few elements for you to make silicone material. Here are they:

• Silicone (Si): The primary element that is used to create silicone is silicon.
• Oxygen: Oxygen is used to combine silicone for the material foundational chain to be created.
• Additional Elements: Various elements like Carbon ( C ), Hydrogen (H), and others are mostly used to form the organic groups attached to the foundational chain that births silicone material.

When silicon and oxygen are combined with other materials, more flexible silicone materials are produced that can be used to create various types.

Latex vs Silicone:  Material Properties

Chemical Composition 

Latex has a carbon-carbon structure and is made of isoprene polymers. Hydrogen bonds connect the polymers to form polyisoprene, the primary constituent of latex. Silicone is a synthetic polymer with a silicon-oxygen backbone. The silicone with the simplest molecule features two linked silicon atoms (siloxane polymers or chains) attached to two oxygen atoms. You will find siloxane polymers and chains in various lengths based on the number of silicon and oxygen atoms that are linked together. 

Cold And Heat Resistance 

Silicone has higher cold and temperature resistance compared to latex. Silicone products are capable of withstanding up to 150°C with little chance of alternation in characteristics. You can even find some silicone rubber that is capable of withstanding heat and cold up to 350°C for a short time. Therefore, silicone material is perfect for high-temperature applications and it has excellent resistance to cold temperatures. On the other hand, latex loses its ductility within the range of -20°C and -30°C. Meanwhile, -60°C and -70°C is that of silicone rubber. This tells you that you can use silicone material for temperatures that latex material cannot withstand. Depending on the silicone you choose, some can even resist temperatures at -100°C or even lower.

Tensile Strength

Latex comes with 25 MPa, while silicone has 5 MPa. This tells you that the tensile strength of latex is superior to that of silicone.

Solvent and Oil Resistance 

Silicone rubber material resists oil at high temperatures. You will find some types of latex that have higher temperature resistance at -100°C. Meanwhile, the temperature resistance of silicone is higher than latex.

When you think of solvents and other chemicals,   silicone also supersedes latex in chemical resistance. This is because latex is affected a little by dilute acids or organic compounds. Meanwhile, silicone materials give optimal performance in non-polar organic compounds such as toluene, benzene, and gasoline.

However, latex material does not dissolve. After you remove the solvent, the material will come back to its original state. Meanwhile, silicone is affected by strong bases and acids. 

Therefore, if you are considering silicone material, it’s important for you not to use it in such chemicals.

Thermal Conductivity 

Silicone exhibits 0.2 W/mΩ·K, making it superior to natural latex thermal conductivity. Additionally, there are some types of silicone material you can utilize for making heating rollers and thermal interface sheets. These types of silicone material come with a higher percentage of thermal conductivity like 1.3 W/mΩ·K.

Electrical Insulation 

Silicone material can maintain its insulating properties in a diverse range of temperatures more than latex material. Irrespective of the water you submerge in silicone, you’ll notice minimal or no reduction in its performance. Plus, they can resist corona discharge and arching at high voltages, thus making them work perfectly in high-voltage applications as insulating material.

Weatherability

The weatherability of silicone rubber is excellent; even ozone that is caused by Corona discharge has minimal or no impact on it. However, latex weatherability cannot withstand ozone. In addition to the weatherability of silicone, they can withstand rain, UV light, and wind for a longer period without having a significant change in their physical properties.

Radiation Resistance 

The radiation resistance of latex material is superior to that of silicone. However, good radiation resistance is present in some silicone materials that come with adjoined phenyl groups. When you have these types of silicone materials, you can use them to produce connectors and cables used in nuclear power plants.

Coloring And Transparency Features

Based on the carbon constituents of most latex rubber, you will mostly find them in black colors. However, silicone material can be used to produce highly transparent products. This reason is because the silica does not hinder the transparency of the natural silicone. Additionally, due to the high transparency of silicone, you can easily add pigments as the coloring, thus giving you the ability to create various molded products with aesthetically appealing interfaces and colors.

Gas Permeability 

The gas permeability and vapor of silicone rubber are greater when compared to natural latex. With this, you can use silicone as a membrane to separate water and gas in oxygen enrichment systems.

Flex Fatigue Resistance 

In general, latex’s ability to exhibit strength to resist dynamic stress is greater than that of silicone material.

Longevity 

When produced, latex’s longevity is compromised immediately. Plus, the color, density, hardness, and texture can be affected by the damage caused when latex is exposed to pressure, a change in temperature, light exposure, stress, etc. Meanwhile, extreme temperatures, UV light, and other elements do not affect silicone. 

The table below further shows the difference between latex and silicone.

Latex vs Silicone: Applications

In this section, we’ll walk you through the various applications of silicone vs latex. Although they have similar applications, there are differences. Here are they:

Applications Of Latex

• Rubber Products: You can use latex to produce rubber bands, gloves, hair bands, and other rubber-related products.
• Medical Products: In the medical industry, latex is used to make devices like breathing bags, catheters, etc.
• Clothes Making: In clothing industries, latex rubber is utilized to make various flexible clothes that stretch like underwear, swimwear, etc.
• Industrial Sealants: Latex material is used to develop adhesives and sealants in the industrial sector. The sealants are further used in construction and building for various purposes.
• Consumer Goods Manufacturing: consumer goods like mattresses, shoe components, and so on can be produced with latex material.
• Industrial Uses: Latex material elasticity as well as wear and tear resistance makes it usable for casts, molds, and other elastic products.
• Hygienic Products: Hygienic products like pacifiers, dental dams, teething rings, finger cots, etc are produced with latex rubber due to the stretchability and the ability of the material to prevent liquid entry.

Applications Of Silicone

• Medicine: Due to the biocompatibility properties of silicone, you will find them in various medical applications like prosthetics, catheters, medical implants, and so on.
• Construction: Silicone is also used to create adhesives and sealants used in the construction industries.
• Consumer Goods: Silicone is used to produce consumer goods like masks, tears, kitchenware, oven mitts, and so on due to the heat and temperature resistance of the material.
• Electronics: Silicone works perfectly in electronics like LED lenses, sensors, touchscreen protectors, etc. due to its high thermal stability.
• Vehicle Manufacturing: Hoses, seals, gaskets, etc are produced from silicone. This is possible because silicone has high water resistance and its durability lasts in the long term.

Latex vs Silicone: Cost

Generally, silicone is costlier than latex. The reason is due to the various advantages silicone possesses over latex. Plus, silicone is popular and widely used in various industries due to its durability and excellent properties.

Latex vs Silicone: Recyclability and Sustainability 

Choosing between silicone vs latex based on recyclability and sustainability comes with some important information you need to be aware of:

Recyclability

You’ll not experience too much difficulty when you want to recycle latex. The reason is that the material is already biodegradable, making them easier to recycle. However, some latex materials are made with other constituents that can’t be recycled which can make recycling some products made with latex difficult to recycle. Meanwhile, silicone is not easily recycled. As you know silicone material is a synthetic polymer, so it does not easily break, thus making its recyclability limited.

Sustainability

As you know latex is obtained from latex, therefore you can renew the material. The trees that produce the material can be cultivated and harvested sustainably without causing harm to the trees.

Meanwhile, silicone has shortcomings in this aspect. As you know silicone is obtained from silicon which is not a natural or renewable source, and there’s a need for a considerable amount of energy for it to be processed. Although silicone is strong and durable, it’s not as sustainable as latex.

Latex vs Silicone: How To Choose?

Choosing between silicone and latex comes with a lot of things to take into consideration. The first thing is to decide the product you want to make with the material, your requirements, etc. Remember, whether you choose silicone or latex, they must comply with your requirements. 

Latex vs Silicone: Alternative Materials

After reading this article, if you feel that latex or silicone does not comply with your requirements, there’s no cause for alarm because there are various other materials you can use as alternatives to latex or silicone.

• Polyurethane: PU is another synthetic rubber material you can use in place of silicone or latex. However, you need to know that there are differences between polyurethane and silicone, just as it is different from latex. However, you can use it as an alternative.
• Polyethylene (PE): This alternative works as a plastic instead of a rubber. However, it’ll give you up to some extent of flexibility and moisture resistance you can use for some applications.
• Nitrile Rubber (NBR): If you know that latex allergy is a turn-off for you, you can consider nitrile rubber.
• Thermoplastic Elastomer (TPE): Thermoplastic elastomer is a general name for materials that perform the work of plastic and rubber. If your requirements prioritize strength and elasticity, you can consider this material.
• Polyvinyl Chloride (PVC): If you need affordable materials, PVC is a perfect match for you. Although you cannot compare the functionality of PVC to silicone or latex, it excels in the production of some products.

Conclusion 

In the end, the superiority of silicone to latex in various aspects like elasticity, chemical resistance, temperature resistance, etc makes it the most preferred in various industries. However, if you are considering recyclability, sustainability, etc. you can consider latex rubber.