Biobased means a product is made wholly or partly from biological, renewable sources like plants, rather than from petroleum or other fossil fuels. The term describes where a material comes from, not what happens to it after you throw it away. A plastic bottle made from sugarcane, a cleaning spray derived from corn oil, or a lubricant based on soybean oil are all examples of biobased products.
How Biobased Content Is Measured
The biobased content of a product is the percentage of its carbon that comes from recently living biological sources, measured against the total organic carbon in the product. A product labeled “72% biobased” gets 72% of its organic carbon from plants or other renewable materials, with the remaining 28% from fossil sources like petroleum.
Scientists verify this using radiocarbon analysis, the same principle behind archaeological carbon dating. Carbon from living plants contains a predictable amount of carbon-14, a naturally occurring radioactive form of carbon. Fossil fuels, which formed millions of years ago, have essentially zero carbon-14 left. By measuring how much carbon-14 is in a product, a lab can determine exactly what proportion of its carbon is biological versus fossil-derived. The standard test method for this in the U.S. is ASTM D6866, and in Europe it’s EN 16785-1. Both rely on this same radiocarbon principle, making the measurement difficult to fake.
Biobased vs. Biodegradable vs. Compostable
This is where most confusion happens. These three terms describe completely different things:
- Biobased refers to a product’s origin. It’s made from renewable biological materials instead of fossil fuels.
- Biodegradable refers to a product’s ability to break down. Microorganisms like bacteria and fungi can decompose it into water, carbon dioxide, and biomass. Without specifying the environment and timeframe, though, the claim is essentially meaningless, since almost anything biodegrades given enough centuries.
- Compostable is a stricter version of biodegradable. A compostable product must break down in a composting environment at a rate similar to other compostable materials. Under the ASTM D6400 standard, 90% of its organic carbon must convert to carbon dioxide within 180 days, and it can’t leave toxic residue behind.
A product can be biobased without being biodegradable. Biobased polyethylene, for instance, is chemically identical to conventional plastic and won’t break down any faster in a landfill. Going the other direction, some biodegradable and compostable plastics are made entirely from fossil materials. Whether something breaks down depends on its chemical structure, not whether it started as corn or crude oil. The USDA’s BioPreferred program certifies only biobased content and makes no claims about biodegradability or compostability.
What Biobased Products Are Made From
The renewable feedstocks behind biobased products fall into two broad categories. First-generation feedstocks are food crops: corn, sugarcane, potatoes, soy, wheat, and vegetable oils. These are the most established sources because the technology to process them into chemicals and plastics is mature. Second-generation feedstocks use non-food biomass: agricultural waste like wheat straw, wood residues from forestry, and other plant matter that would otherwise be discarded.
At the chemical level, the most commonly used plant components are carbohydrates (starches and sugars), vegetable oils, lignin (the rigid compound in wood), and terpenes (aromatic compounds found in many plants). These can be processed into building blocks for plastics, solvents, lubricants, adhesives, inks, cleaning products, and thousands of other materials.
USDA Certification and Labeling
In the United States, the USDA runs the BioPreferred program, which lets qualifying products carry a “USDA Certified Biobased Product” label. The required minimum biobased content varies by product category, and some of the thresholds are quite specific. Chain and cable lubricants must contain at least 77% biobased content. Gear lubricants need at least 58%. Food cleaners and corrosion preventatives require 53%. General purpose household cleaners need 39%, and industrial cleaners need 41%.
Products that don’t fall into any established USDA category must contain at least 25% biobased content to qualify for the label. Verification requires testing by a third-party lab using the ASTM D6866 radiocarbon method, so manufacturers can’t simply self-declare their biobased percentage.
Does Biobased Mean Better for the Environment?
The environmental picture is more nuanced than many labels suggest. The intuitive assumption is that plant-based materials have a smaller carbon footprint than petroleum-based ones, because plants absorb carbon dioxide as they grow. In practice, the advantage depends heavily on the specific product and how the feedstock is grown.
A life cycle comparison of biobased versus petroleum-based PET (the plastic in water bottles) found only a 2% to 7% difference in climate impact, depending on whether land-use change was factored in. When wheat straw was used as the feedstock instead of a dedicated crop, performance was similar to conventional PET. Growing crops specifically for bioplastics can involve fertilizers, pesticides, irrigation, and land clearing, all of which carry their own environmental costs.
Where biobased products do offer a clear structural advantage is in reducing dependence on finite fossil resources. Plants regrow; petroleum does not. Over time, shifting to renewable carbon sources changes the fundamental resource equation even when the immediate carbon footprint is comparable. But “biobased” on a label is not a shorthand for “eco-friendly.” The full picture depends on what the feedstock is, how it was farmed, how the product was manufactured, and what happens to it at end of life.