An LVP-VOC, or low vapor pressure volatile organic compound, is a carbon-containing chemical that evaporates slowly enough to be excluded from the regulated VOC content of a consumer product sold in California. California’s definition lives in 17 California Code of Regulations Section 94508, and it recognizes four separate ways a single compound or a chemical mixture can qualify. Because an LVP-VOC’s weight drops out of the Regulatory VOC calculation, classifying ingredients correctly is often the difference between a product that meets its category limit and one that cannot legally be sold.
The Four Ways an Ingredient Can Qualify
Under Section 94508, a compound or mixture qualifies as an LVP-VOC if it contains at least one carbon atom and meets any one of the following criteria.1Cornell Law School. California Code 17 CCR 94508 – Definitions
- A vapor pressure below 0.1 millimeters of mercury at 20°C, as determined by CARB Method 310.
- A single compound with more than 12 carbon atoms, or a mixture made up entirely of compounds with more than 12 carbon atoms. This path is available only when both vapor pressure and boiling point are unknown.
- A single compound with a boiling point above 216°C, as determined by CARB Method 310.
- For a chemical mixture, only the weight percentage that boils above 216°C counts as an LVP-VOC. The remainder is treated as a regular VOC.
The second criterion is the one formulators most often misread. The carbon-atom count is not a free-standing shortcut; it only applies when you cannot determine vapor pressure or boiling point. If either value is known, you have to qualify the ingredient under one of the other three paths.1Cornell Law School. California Code 17 CCR 94508 – Definitions
Compounds vs. Mixtures
The regulation draws a firm line between the two. A compound is a molecule with a definite chemical formula and isomeric structure. A mixture is two or more compounds blended together. The distinction matters most on the carbon-atom path: a mixture qualifies only if every component in the blend has more than 12 carbon atoms. One short-chain molecule in the blend disqualifies the whole thing from that pathway.
It also matters on boiling point. A single compound either boils above 216°C or it doesn’t. A mixture can boil across a range, and California accounts for that with the partial-boiling rule: the fraction above 216°C is exempt, the fraction below counts as regulated VOC. A solvent blend that is “mostly” high-boiling can still push a product over its VOC limit if a meaningful percentage evaporates below the threshold.
What Qualifying Actually Does
Once an ingredient is verified as an LVP-VOC, its weight is excluded from the product’s total VOC content for compliance purposes.2California Air Resources Board. LVP-VOC Research The remaining VOC weight, divided by the product’s net weight, gives the Regulatory VOC value. That number has to fall at or below the limit set for the product’s category in the Table of Standards under 17 CCR Section 94509.
Those category limits swing hard. Nonaerosol general purpose cleaners and degreasers face a ceiling of 0.5 percent VOC by weight. Aerosol adhesives are allowed up to 75 percent. Hair finishing sprays sit at 50 percent, brake cleaners at 10 percent.3Cornell Law School. California Code 17 CCR 94509 – Standards for Consumer Products A product that looks hopelessly over its limit on paper can sometimes clear it easily once LVP-VOC solvents are subtracted.
Take a nonaerosol glass cleaner carrying a total VOC load of 8 percent by weight. If 6 of those percentage points come from verified LVP-VOCs, the Regulatory VOC drops to 2 percent, under the 3 percent category limit. Without the exemption, that same formula would be unsalable in California.
How You Prove an Ingredient Qualifies
Verification usually starts with paperwork a chemical supplier already provides. A Safety Data Sheet and Technical Data Sheet often list vapor pressure and boiling point, and when those values are present, they can form the basis of your formulation data with no independent testing required. When they aren’t, you need lab work.
Approved ASTM Methods
California approves several ASTM protocols for filling data gaps. For vapor pressure: ASTM D2879-97, ASTM E1719-97, or ASTM E1782-08. For boiling point: ASTM D86-01, ASTM D850-00, ASTM D1078-01, or ASTM D2887-01.4Cornell Law School. California Code 17 CCR 94515 – Test Methods These are referenced in Section 94515 and incorporated into the regulation.
CARB Method 310
CARB Method 310 is the agency’s own analytical protocol for determining VOC content in consumer products, and it functions as the definitive test. A CARB enforcement officer can pull a sample of the LVP-VOC used in your formulation, measure its boiling point, and reclassify the ingredient. If the boiling point exceeds 216°C, the ingredient is confirmed as an LVP-VOC. If it falls below, only the weight percentage of a mixture that boils above 216°C keeps that status.5New York Codes, Rules and Regulations. California Code of Regulations 17 94515 – Test Methods
One detail controls everything else: when CARB Method 310 results conflict with your formulation data, Method 310 wins. The regulation is explicit that it takes precedence and can be used on its own to establish a violation.5New York Codes, Rules and Regulations. California Code of Regulations 17 94515 – Test Methods Relying on a supplier’s SDS without independent confirmation is a bet; if CARB’s lab produces different numbers, the SDS does not save you.
Testing Blended Solvents
Hydrocarbon solvents used in consumer products are rarely single compounds. They’re complex blends supplied to a specification, and isolating every molecule is impractical. Under both California and federal rules, the vapor pressure of the blend as a whole can be used to demonstrate compliance; you do not have to test each component separately.6eCFR. National Volatile Organic Compound Emission Standards for Consumer Products For the partial-boiling rule, CARB uses a distillation test to identify the nearest 1-percent cut above 216°C, and only the portion above that cut qualifies.
How the Federal Low-Volatility Exemption Differs
The EPA sets national VOC content limits for consumer products under 40 CFR Part 59, Subpart C, and offers its own low-volatility exemption. The first two federal criteria mirror California: vapor pressure below 0.1 mm Hg at 20°C, or more than 12 carbon atoms when vapor pressure is unknown.7eCFR. 40 CFR 59.203
The frameworks diverge after that. California looks at boiling point above 216°C. The federal rule instead exempts compounds with a melting point above 20°C that do not sublime, and only when vapor pressure is unknown.7eCFR. 40 CFR 59.203 California’s fourth path, the partial-boiling rule for mixtures, has no federal equivalent. A compound can qualify under California’s boiling-point test while failing the federal melting-point test, or the reverse. Products distributed nationally need to be verified under both frameworks independently.
The federal rule also gives more latitude on supplier data: manufacturers may rely on vapor pressure information from raw-material suppliers so long as the supplier used a method “generally accepted by the scientific community.” California ties its testing to the specific CARB and ASTM methods above and keeps the Method 310 override.
A Short Verification Checklist
Pulling the definition into a workable process means building the file before anyone asks for it.
- Collect Safety Data Sheets and Technical Data Sheets for every ingredient. Flag any ingredient where both vapor pressure and boiling point are missing, because that is the only situation where the carbon-atom path is available.
- For ingredients with incomplete data, run ASTM-approved tests for vapor pressure or boiling point.
- For each LVP-VOC, record which of the four criteria it satisfies and the specific data supporting that conclusion. An auditor should be able to trace every exempted ingredient back to a lab result or supplier data point.
- When calculating Regulatory VOC, subtract only the weight you have documented as LVP-VOC. For mixtures that only partially boil above 216°C, subtract only the qualifying fraction.
- Keep lab reports, supplier certifications, formulation records, and VOC calculations in a compliance file for at least three years.8California Air Resources Board. Consumer Products Regulation
The gap between “this ingredient is probably an LVP-VOC” and “we can prove it under Method 310” is where most enforcement actions start. Verification is a scientific question first and a paperwork question second.