Under federal rules, the pyrotechnic composition limits for consumer fireworks are strict and specific: 50 milligrams of report-producing composition in a firecracker, 130 milligrams (2 grains) in any other device designed to make a bang, and 500 grams of total chemical composition in a single item. Anything above those numbers stops being a consumer firework. It becomes either a banned hazardous substance or a display-grade explosive that only federally licensed professionals can handle.
The limits sit in two different places in federal law. The Consumer Product Safety Commission writes the audible-effect ceilings into 16 CFR 1500.17. The total-weight ceilings come from APA Standard 87-1A, which the Department of Transportation incorporates by reference at 49 CFR 173.65. A legal consumer firework has to clear both sets of thresholds.
Limits on Audible-Effect Composition
The CPSC treats firecrackers and other report-producing devices as two separate categories.
- A firecracker’s audible-effect composition cannot exceed 50 milligrams (0.772 grains). The casing itself cannot be longer than 1.5 inches or wider than 0.25 inches in diameter.1eCFR. 16 CFR 1500.17 – Banned Hazardous Substances2GovInfo. 16 CFR 1500.17 – Banned Hazardous Substances
- Any other firework designed to produce a report, including aerial shells with a bang component, cannot contain more than 2 grains (130 milligrams) of pyrotechnic composition for that audible effect.3U.S. Consumer Product Safety Commission. Fireworks
The regulation is written in terms of “pyrotechnic composition” producing the audible effect, not “flash powder” specifically. Flash powder, usually an aluminum-and-oxidizer blend, is the common formulation, but any reactive mixture that creates the bang counts against these ceilings. The colored stars and other visual components in a shell burn more slowly and are measured separately under the total-composition rules.
Devices that blow past the 130-milligram audible-effect ceiling have been federally banned since 1966. That category includes cherry bombs, M-80 salutes, silver salutes, and quarter sticks. The ban reaches past finished devices to cover kits and loose components intended to build them.4U.S. Consumer Product Safety Commission. Fireworks Business Guidance
Total Chemical Composition Limits by Device
Alongside the milligram limits on reports, every consumer firework has to stay within a total chemical weight ceiling that covers everything reactive in the device: lift charges, burst charges, stars, and effects combined.
Multi-Tube Cakes
Standard multi-tube cakes are capped at 200 grams of total combined composition across all tubes. Larger “500-gram cakes” may hold between 200 and 500 grams.5American Pyrotechnics Association. 2018 APA Standard 87-1A – Standard for Construction and Chemical Composition of Consumer Fireworks The 500-gram number is the hard ceiling for any single consumer item. A device above it is no longer a Division 1.4G consumer firework; it becomes a 1.3G display product that requires a federal explosives license to buy, store, or fire.
Reloadable Aerial Shell Kits
Reloadable kits, where individual shells are dropped into a mortar tube, carry their own sub-limits. Each shell is capped at 60 grams of total chemical composition including the lift charge, effects, and break charge. The complete kit cannot exceed 400 grams total.5American Pyrotechnics Association. 2018 APA Standard 87-1A – Standard for Construction and Chemical Composition of Consumer Fireworks
Ground-Based Devices
Smaller consumer items have lower ceilings. Cylindrical fountains top out at 100 grams of composition per device, cones at 50 grams, and sparklers at 100 grams.
Chemicals That Can’t Be Used at All
Weight compliance alone doesn’t make a device legal. Under 16 CFR 1507.2, the following substances cannot appear in consumer fireworks regardless of how little is used:
- Arsenic compounds (arsenates, arsenites, arsenic sulfide)
- Boron
- Chlorates, with narrow exceptions for colored smoke mixtures containing equal or greater sodium bicarbonate, caps and party poppers, and small ground items under 4 grams of total powder
- Gallates and gallic acid
- Magnesium in pure form (magnalium alloy is allowed)
- Mercury salts
- Phosphorus, red or white, with an exception for red phosphorus in caps and party poppers
- Picrates and picric acid
- Thiocyanates
- Titanium in fine particle sizes of 100-mesh or smaller
- Zirconium
Lead compounds, including red lead oxide, are also prohibited under the Department of Transportation’s approved-chemicals framework.6eCFR. 16 CFR Part 1507 – Fireworks Devices7Pipeline and Hazardous Materials Safety Administration. List of Approved and Prohibited Fireworks Chemicals These chemical restrictions apply only to consumer devices; licensed professionals using display fireworks operate under different rules.
Fuse Burn Time
Consumer fireworks must use a fuse that burns at least 3 seconds and no more than 9 seconds before igniting the device.8eCFR. 16 CFR 1507.3 – Fuses A shorter fuse doesn’t leave the user time to clear the area; a longer one invites someone to walk back toward a device they assume has failed. A fuse outside that window makes the whole device a banned hazardous substance under 16 CFR Part 1507, regardless of how its composition weighs out.
What Happens When a Device Exceeds the Limits
A firework over any of these thresholds is treated as a banned hazardous substance under the Federal Hazardous Substances Act. So are the components or kits used to build one, even if the materials are broken up across separate packages. If the clear purpose of the materials is to assemble a device above the composition limits, the materials themselves are illegal.3U.S. Consumer Product Safety Commission. Fireworks The CPSC can seize non-compliant shipments before they reach consumers and monitors online marketplaces for pre-mixed flash powder sold in quantities that only make sense for building illegal salutes.4U.S. Consumer Product Safety Commission. Fireworks Business Guidance
The penalty structure runs on two tracks. Civil penalties under the FHSA reach $100,000 per violation, with each substance counted separately, capped at $15,000,000 for a related series. These amounts are adjusted for inflation every five years. A first criminal violation is a misdemeanor carrying up to $500 and 90 days in jail. Second offenses, or any violation committed with intent to defraud or mislead, become felonies with up to 5 years in prison and fines set under 18 U.S.C. 3571.9GovInfo. 15 USC 1264 – Penalties and Exceptions
A device above the 500-gram total ceiling crosses out of consumer territory entirely and into the 1.3G display category. Manufacturing, importing, or dealing in those materials without a federal explosives license from the Bureau of Alcohol, Tobacco, Firearms and Explosives carries up to $10,000 in fines and 10 years in prison under 27 CFR Part 555. Improper storage of explosive materials runs up to $1,000 and one year in prison.10eCFR. 27 CFR Part 555 – Commerce in Explosives
State Law Can Be Stricter
Meeting the federal composition limits does not make a device legal everywhere it can be sold. As of 2025, roughly 29 states allow the full range of consumer fireworks, including reloadable aerial shells. Massachusetts bans all consumer fireworks. California, New Jersey, New York, and several others restrict sales to ground-based “safe and sane” items or novelties like sparklers. A 500-gram cake built within every federal composition rule can still trigger a criminal charge one state line away, so the limits in this article are the floor for legality, not the whole picture.