99.5% Acidum boricum powder H3BO3 CAS NO 10043-35-3 use for

pyrotechnics agriculture and recreational

►Description

A white or colorless crystalline compound, H₃BO₃, either naturally

occurring or made from borax. It is used as anantiseptic and preservative,

and in cements, enamels, and cosmetics.

Boric acid, also called hydrogen borate, boracic acid, orthoboric acid and

acidum boricum, is a weak, monobasic Lewis acid of boron, which is often

used as an antiseptic, insecticide, flame retardant, neutron absorber, or

precursor to other chemical compounds. It has the chemical formula H3BO3

(sometimes written B(OH)3), and exists in the form of colorless crystals or a

white powder that dissolves in water. When occurring as a mineral, it is called

sassolite.

Boric Acid has been used since the ancient Greeks as a method to fireproof cloth.

It is a mild astringent that kills bacteria and is used in eyewash to this day. It is also

used as a Roach Killer. In the late 1800’s and early 1900’s it was still used as a

food preservative until we found it was killing people and was banned from this use.

In the past Boric Acid was used as 3% in ointment for babies diaper rash. Then we

found this Boric Acid diaper rash cream made sick, caused permanent damage,

and killed human infants when applied to babies diaper rash.

In 1964 a researcher named Wong published some studies that Boric Acid was

much more toxic than once thought, but his work was largely ignored.

There are no studies that show Boric Acid is safe in mattresses. The industry

claims it’s safe because we have always done it that way, and don’t know of killing

anyone yet.

The industry claims Boric Acid has been ‘widely’ used in mattresses for over thirty

years. However, a cotton-batting manufacturer told us that none of his innerspring

mattress manufacturer customers use boric acid treated cotton. Since 1973 Boric

Acid treated cotton has been used in some mattresses to pass the cigarette ignition

law. However, simply putting a layer of polyester or foam under the ticking passes

the test without any added chemicals. Most manufacturers simply stopped putting

cotton in mattresses. Those who continued usually put a thin layer polyester or

foam quilted in the ticking and over the cotton batting rather than pay the 7% extra

cost of treated cotton. A very small number of the very cheapest mattresses may

have still used unquilted ticking with Boric Acid treated cotton directly under the

ticking.

►Specification

► Molecular and crystal structure

The three oxygen atoms form a trigonal planar geometry around the boron. The B-

O bond length is 136 pm and the O-H is 97 pm. The molecular point group is C3h.

Crystalline boric acid consists of layers of B(OH)3 molecules held together by

hydrogen bonds of length 272 pm. The distance between two adjacent layers is

318 pm.

Based on mammalian median lethal dose (LD50) rating of 2,660 mg/kg body

mass, boric acid is only poisonous if taken internally or inhaled in large quantities.

The Fourteenth Edition of the Merck Index indicates that the LD50 of boric acid is

5.14 g/kg for oral dosages given to rats, and that 5 to 20 g/kg has produced death

in adult humans. For comparison's sake, the LD50 of salt is reported to be 3.75

g/kg in rats according to the Merck Index. According to the Agency for Toxic

Substances and Disease Registry, "The minimal lethal dose of ingested boron (as

boric acid) was reported to be 2–3 g in infants, 5–6 g in children, and 15–20 g in

adults. However, a review of 784 human poisonings with boric acid (10–88 g)

reported no fatalities, with 88% of cases being asymptomatic."Toxicology

Long-term exposure to boric acid may be of more concern, causing kidney damage

and eventually kidney failure (see links below). Although it does not appear to be

carcinogenic, studies in dogs have reported testicular atrophy after exposure to 32

mg/kg bw/day for 90 days. This level is far lower than the LD50.

According to the boric acid IUCLID Dataset published by the European

Commission, boric acid in high doses shows significant developmental toxicity and

teratogenicity in rabbit, rat, and mouse fetuses as well as cardiovascular defects,

skeletal variations, and mild kidney lesions. As a consequence in the 30th ATP to

EU directive 67/548/EEC of August 2008, the European Commission decided to

amend its classification as reprotoxic category 2, and to apply the risk phrases R60

(may impair fertility) and R61 (may cause harm to the unborn child).

At a 2010 European Diagnostics Manufacturing Association (EDMA) Meeting,

several new additions to the Substance of Very High Concern (SVHC) candidate

list in relation to the Registration, Evaluation, Authorisation and Restriction of

Chemicals Regulations 2007 (REACH) were discussed. Following the registration

and review completed as part of REACH, the classification of Boric Acid CAS

10043-35-3 / 11113-50-1 is listed from 1 December 2010 is H360FD (May damage

fertility. May damage the unborn child.)

►Application in Industry

Pyrotechnics

Boron is used in pyrotechnics to prevent the amide-forming reaction between

aluminum and nitrates. A small amount of boric acid is added to the composition to

neutralize alkaline amides that can react with the aluminum.Boric acid can be used

as a colorant to make fire green. For example, when dissolved in methanol it is

popularly used by fire jugglers and fire spinners to create a deep green flame.

Agriculture

Boric acid is used to treat or prevent boron deficiencies in plants. It is also used in

preservation of grains such as rice and wheat.

Recreational

For the game of carrom, boric acid is sprinkled onto the board of play to act as a

dry lubricant to increase the speed of the pieces when struck.