Silicone has become a popular alternative to plastic in a wide variety of applications, from kitchenware, car parts, and medical devices to baby products and cosmetics. It’s heat-resistant, flexible, and long-lasting—but its safety and sustainability depend on how it’s made and used. Below, we’ll look at whether silicone is truly non-toxic, how it compares to plastic and rubber, and what to consider if you’re choosing silicone as a non-toxic, eco-friendly material.
What is silicone made of? Is silicone plastic?
Silicone, also known as polysiloxane, is a class of synthetic polymers derived from silica (found in sand), oxygen, carbon, and hydrogen. This group of polymers is bound together in chains of silicon-oxygen (siloxane) bonds, with various organic compounds attached. While plastic is also a synthetic polymer, most are made from carbon-based chains. So although it shares some similarities with plastic (which is petroleum-derived), silicone differs at the molecular level and in its qualities. It is also not the same thing as natural rubber (which is derived from the sap of the rubber tree) or synthetic rubber, which is plastic.
How silicone is made?
Silica, or silicon dioxide (SiO2), is the most significant component of the Earth’s crust. This natural compound is found in rock, clay, and sand worldwide. To produce silicone, silica undergoes a five-step process:
- Separation of silicon from silica – This is achieved by heating quartz sand to 1800℃. The pure silicon (Si) is then cooled and ground.
- Addition of Methyl Chloride – Under heat, this reaction forms methyl chlorosilane compounds.
- Distillation – The mixture is distilled to separate the various compounds.
- Addition of water – Results in the formation of polydimethylsiloxane.
- Polymerization – Combining this mixture with water or methanol removes the chlorine atoms, allowing the remaining molecules to bind together into alternating silicon-oxygen polymer chains
Sustainability of silicone
Silicone’s greatest sustainability strength is its durability. Silicone products can last for many years, reducing the need for frequent replacement, and are a low-waste alternative to single-use products. It is generally considered chemically stable, may not readily leach additives, and does not fragment into the same persistent microplastics associated with conventional plastics. But its production is energy-intensive and generates greenhouse gas emissions, particularly during the conversion of quartz into silicon. Silicone is not biodegradable, and recycling options remain limited.
Sourcing
According to the UN Environment Programme (UNEP), “the extraction, sourcing, use, and management remain largely ungoverned in many regions of the world, leading to numerous environmental and social consequences that have been mostly overlooked.” Sand may be abundant, but its extraction can damage ecosystems, harm biodiversity, increase erosion, and affect groundwater. Labor exploitation within this industry is also of concern. Granted, the vast majority of extracted sand is used in concrete, but it is important to be aware of these impacts nonetheless.
Production
Most of silicone’s environmental impact occurs during manufacturing rather than use. The largest contributor is typically the production of silicon metal from quartz, which requires extremely high-temperature furnaces and significant electricity. Additional impacts come from the energy-intensive chemical processes used to convert silicon into silicone polymers, as well as the water, heat, and wastewater treatment required during polymerization and purification.
According to an industry-funded study, the emissions associated with producing and disposing of silicone may be outweighed by the energy and emissions savings that silicone enables in products such as building insulation, solar panels, LEDs, and electric vehicles.
Is silicone toxic? Is is safer than plastics?
When of good quality, silicone is generally considered to be very safe. Quality silicone is generally considered chemically stable and is less likely to leach substances of concern such as BPA or phthalates, which are not used in silicone production; it also does not shed microplastics. These qualities make it a superior choice over plastics.
You may come across advice online suggesting that high-quality silicone should not turn white when bent or twisted. While this test is commonly repeated by manufacturers and bloggers, I was unable to find independent research or regulatory guidance supporting it as a reliable measure of silicone quality, safety, or filler content. Product certifications and compliance with food-contact standards are likely more meaningful indicators.
When shopping for silicone items:
- Choose silicone cured with platinum, which is often preferred for food-contact, medical, and other high-purity applications because the curing process produces fewer residual byproducts than peroxide curing. However, both platinum-cured and properly manufactured peroxide-cured silicones can be formulated to meet food-contact standards.
- Silicone, especially in kitchen, personal care, and baby products, should undergo testing to demonstrate it meets FDA, EU, or LFGB safety standards. This information should be present on product packaging or the website description.
- The presence of a BPA-free label is common and, while reassuring, is not necessary. While this additive is a concern in plastic, BPA is not used in silicone production. The “BPA-free” label on silicone is largely a marketing strategy to address consumer concerns.
End of Life
Silicone is made with naturally occurring materials, but it is not biodegradable in the traditional sense, and more study is needed to understand its degradation. However, silicone is generally considered chemically stable and does not break down into conventional microplastics commonly found in waterways and soils.
Some silicone-related chemicals have raised environmental concerns because they persist in the environment and can accumulate in aquatic organisms. Laboratory studies have found harmful effects at sufficiently high exposures, particularly for the compound D4. However, evidence that these compounds are causing widespread ecological harm at current environmental concentrations remains limited and is still being studied.
Silicone recycling is possible but extremely limited. Most unusable silicone must be disposed of in the trash.
Should You Choose Silicone?
Silicone’s greatest sustainability strength is its durability, but that durability also creates challenges at end of life. While silicone products can last for many years and reduce the need for frequent replacement, their production is energy-intensive and recycling options remain limited. Researchers are actively developing new ways to reuse, recycle, and break down silicone materials more effectively.
For durable, reusable products, silicone is often a better choice than conventional plastic. Overall, silicone is not an impact-free material, but its safety, longevity, and performance can make it a reasonable choice, especially for short-lived alternatives. Still, because of its non-biodegradability and limited recycling, I believe it should be used sparingly in the home when other quality biodegradable or recyclable materials (such as glass, metal, wood, or bamboo) are available.
Best uses:
- In place of single-use products, such as Ziploc bags, parchment paper, cupcake liners, and tampons.
- Cooking utensils, primarily those for scraping, where their unmatched flexibility and efficiency shine, and flipping, as silicone turners provide a durable and non-scratch alternative to plastic for use with non-stick pans.
- Non-plastic alternatives in baby products such as pacifiers and bottle nipples, especially if natural latex is a concern.
| Pros of Silicone | Cons of Silicone |
|---|---|
| Generally considered safe and chemically stable | Environmental impacts from sand/quartz extraction |
| Does not contain chemicals such as BPA or phthalates | Production is energy-intensive |
| More durable and longer-lasting than plastic | Recycling options are limited |
| Flexible, lightweight, and non-stick | More expensive than plastic |
| Resist chemicals, moisture, heat, cold, and UV radiation | Not biodegradable |
| Dishwasher, oven, and microwave safe | Can be difficult to verify quality and manufacturing standards |
| Made primarily from abundant silica (sand-derived) resources | Limited end-of-life options |
| Does not shed conventional microplastics | May persist in the environment after disposal |
Sources:
Brook, M. and Chen, Y. (2025, Aprill 11) Strategies to Improve the Sustainability of Silicone Polymers. ACS Publications. https://pubs.acs.org/doi/10.1021/acs.macromol.5c00179
Elkem. (2025, December 15). Is silicone sustainable? Understanding its carbon footprint and life-cycle impact. Elkem. https://magazine.elkem.com/innovation–sustainability/is-silicone-sustainable-understanding-its-carbon-footprint-and-life-cycle-impact/
Simtec. (2022, December 11). Silicone: A Guide to Production, Uses and Benefits. Simtec. https://www.simtec-silicone.com/blogs/how-is-silicone-produced/
United Nations Environmental Programme (UNEP). (2022). Sand and Sustainability: 10 Strategic Recommendations to Avert a Crisis. https://www.unep.org/resources/report/sand-and-sustainability-10-strategic-recommendations-avert-crisis