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Pure Boric Acid Crystals , Best Boric Acid For Ramming Mass / Glass Ceramics

Pure Boric Acid Crystals , Best Boric Acid For Ramming Mass / Glass Ceramics

    • Pure Boric Acid Crystals , Best Boric Acid For Ramming Mass / Glass Ceramics
    • Pure Boric Acid Crystals , Best Boric Acid For Ramming Mass / Glass Ceramics
    • Pure Boric Acid Crystals , Best Boric Acid For Ramming Mass / Glass Ceramics
  • Pure Boric Acid Crystals , Best Boric Acid For Ramming Mass / Glass Ceramics

    Product Details:

    Place of Origin: CHINA
    Brand Name: YIXIN
    Certification: ISO9001
    Model Number: YXB-005

    Payment & Shipping Terms:

    Minimum Order Quantity: 1-20ton
    Packaging Details: 25kg/bag
    Delivery Time: 5-12days after recieved deposit
    Payment Terms: L/C, T/T, Western Union
    Supply Ability: 5000ton/per month
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    Detailed Product Description
    UN NO: 1439 Color: White
    Properties: Powder Purity: 99.5%
    Packing: 25kg Density: 1.44
    High Light:

    pure boric acid


    organic boric acid

    Powder orthoboric acid H3BO3 used in manufacturing of ramming

    mass and glass ceramics






    H3BO3 99.50%
    NH3 0.60%
    SO4 0.30%
    CL ≤0.15%
    Fe ≤0.06%
    Water insoluble ≤0.06%

    ►Origin of Boric acid 


        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





    Poruct name

     Boric acid

    Molecular formula H3BO3
    Molecular wight 61.83
    Properties Colorless crystal or white powder
    Purity 99.5%
    UN number 1439

    ► 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.)







         Boric acid may be prepared by reacting borax (sodium tetraborate


    decahydrate) with a mineral acid, such as hydrochloric acid:


    Na2B4O7·10H2O + 2 HCl → 4 B(OH)3 [or H3BO3] + 2 NaCl + 5 H2O


    It is also formed as a by product of hydrolysis of boron trihalides and




    B2H6 + 6 H2O → 2 B(OH)3 + 6 H2


    BX3 + 3 H2O → B(OH)3 + 3 HX (X = Cl, Br, I)




     ►Application in Industry



    1. As part of some proprietary formulas




       In electroplating, boric acid is used as part of some proprietary formulas. One suc


    h known formula calls for about a 1 to 10 ratio of H3BO3 to NiSO4, a very small por


    tion of sodium lauryl sulfate and a small portion of H2SO4.




    2. Manufacturing of ramming mass




       It is also used in the manufacturing of ramming mass, a fine silica-


    containing powder used for producing induction furnace linings and ceramics.

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