Virtually all firecrackers are scientifically classed as "low explosives" which burn through deflagration, as opposed to "high explosives" such as dynamite and ANFO which actually produce a supersonic detonation wave. Some legal definitions nevertheless define banned firecrackers (such as the M-80 in the United States) as "Class B Explosives" which requires their storage in an explosives magazine and an ATF high explosives license for their manufacture.
The legal status of firecrackers typically stems from their notable effect on noise pollution as well as the issue of their safety, especially when used by children. Devices which are designed to explode at ground level are seen as more dangerous than those with a prolonged burn time and/or an aerial explosion. Proponents of firecracker sales sometimes question the consistency of these laws, pointing out that legal fireworks can also be dangerous due to the risk of high-temperature burns (as in the case of sparklers), and that projectile fireworks intended for aerial use can often legally incorporate a noise making explosive device as a last stage.
In Malaysia, playing with firecrackers is now illegal as stated from Malaysian Explosive Act which was revised in 1991 as a result of the increasing injuries among children (especially Malay) during Hari Raya festive season. Ironically, the injury cases caused by playing firecrackers continue to increase every year since Malay children turned to home-made firecrackers such as bamboo cannons as alternatives to commercial fireworks.
In the Republic of Ireland, firecrackers (commonly called "bangers") are illegal, but they are easily smuggled across the border with Northern Ireland in the weeks leading up to Hallowe'en.
In Sweden, firecrackers became completely illegal December 1st, 2000.
In Singapore, a partial ban on firecrackers was imposed in March 1970 after a fire killed six people and injured 68. This was extended to a total ban in August 1972, after an explosion that killed two people and an attack on two police officers attempting to stop a group from letting off firecrackers in February 1972. However, in 2003, the government allowed firecrackers to be set off during the festive season. At the Chinese New Year light-up in Chinatown, at the stroke of midnight on the first day of the Lunar New Year, firecrackers are set off under controlled conditions by the Singapore Tourism Board. Other occasions where firecrackers are allowed to be set off are determined by the tourism board or other government organizations. However, they are not allowed to be commercially sold.
Some firecrackers are legal but restrictions are in place regarding the amount of powder they contain. Some examples are: Wolf Pack FireCrackers, Black Cat FireCrackers, China Town FireCrackers, Hydro FireCrackers, and the Wolf Pack Cannon Ball FireCrackers.
In general Novelty Noise Makers are not true firecrackers/fireworks because of the lack of danger or flame, and are legal in many places where fireworks and firecrackers are illegal.
Once flash powder, which produces a significantly sharper and brighter bang, replaced black powder as a firecracker's explosive charge (in approx. 1924) manufacturers began competing to gain the purchasing loyalty of the consuming public (i.e., mainly boys 8-16 years of age). Literally thousands of brands were created during the flash light cracker's heyday period from the 1920s through the early 1970s. Only a small percentage of brands lasted more than a year or two. Nowadays, collectors actively seek out examples of the various labels which contained the brand name and image associated with that brand. Until very recently (i.e., mid 1980s) firecracker production was a low-tech process. They were entirely handmade, beginning with the operation of rolling thin tubes. Once the firecracker tubes were rolled by hand (most commonly from newspaper) and labelled, and then filled with powder, their ends were crimped and fuses inserted... all by hand. These finished firecrackers were usually braided into "strings" and sold in packs which came in many sizes... from the very small (called "penny packs" containing as few as 4 to 6 firecrackers) to the most common size packs (containing 16 and 20 crackers per pack), to larger packs (containing 24, 30, 32, 40, 50, 60, 72, 90, 100 and 120 firecrackers), to huge "belts" and "rolls" (firecracker packages which contained strings of several hundred to several thousand crackers each). Firecracker packages were typically wrapped in colourful and translucent glassine paper, as well as clear cellophane. Glassine was the most popular, however.
The final packaging operation involved applying a branded pack label on each and every pack and then bundling quantities of finished packs into larger wholesale lots called "bricks" which contained an average of 80 packs each (varying according to the size of the packs being bundled. For example, packs of 32 crackers might only have 40 packs to the brick, compared to packs of 16 or 20 which would have 80 packs to the brick.
(Flaws may include: Tears, rips, holes, missing pieces, water damaged, powder damaged, price or writing on label, factory stained or blurred graphics, crooked & offset labels, taped, repaired, etc.)
There are a few exceptions to the aforementioned guidelines, some Firecrackers in class 5, 6, & 7 may say "Made in China" like Class 1, but have the cautions/warnings, etc. Firecrackers larger than 1 1/2", or made for other countries may not conform to the above guidelines).