 Chemical
name: 3,4,5- trihydroxybenzoic acid Molecular formula
and weight( based on 1983 international atomic weight )
Molecular formula: C6H2(HO)3
.COOH.H2O
Molecular weight: 188.4
Properties:White or grey white crystalline
powder,losing crystal water at 100°C . Soluble in acetone,ethyl
acetate, 85-share water, 6-share ethanol, 2-share boiling
water, slightly soluble in cold water, insoluble in benzene
or trichloromethane.
Use:Industrial gallic acid used in analyzing
and testing bismuth, cerium, copper, nitryl,phosphorus, silver,
thorium and titanium etc.. It is also widely used in the fields
including organic synthesis, pharmaceutical, ink, dyes, national
defence and food etc..
Specification: in accordance with JIS K8898-61
and GB5309-85
Main technical index:
|
Top quality of Japanese
standard |
Top quality of national
standard |
Factory standard |
Content
% ≥ |
98.5 |
98.5 |
99.50 |
Water
solubility test |
Yellowish, clear |
Yellowish, clear |
Yellowish, clear |
Loss
on drying % ≤ |
10.0 |
10.0 |
10.0 |
Residue
on ignition % ≤ |
0.05 |
0.10 |
0.05 |
Sulphate
% ≤ |
10.0 PPM |
0.02 |
10.0 PPM |
Tannin
test≤ |
1.0 PPM |
1.0 PPM |
1.0 PPM |
Turbidity
≤ |
10.0 PPM |
10.0 PPM |
10.0 PPM |
Chromatic
number APHA ≤ |
150 |
180 |
150 |
Contract index for exporting to the us
Characteristic
|
Specification
|
Method
|
Source
|
Assay
|
> 98.0%
|
Acid-Base
Titration |
Reagent
Chemicals, 9th ed., ACS |
Al
|
2000 ppb
max |
Manufacturer
Method |
Manufacturer
Method |
Ca
|
4000 ppb
max |
Manufacturer
Method |
Manufacturer
Method |
Fe
|
3000 ppb
max |
Manufacturer
Method |
Manufacturer
Method |
Mg
|
1000 ppb
max |
Manufacturer
Method |
Manufacturer
Method |
K
|
2000 ppb
max |
Manufacturer
Method |
Manufacturer
Method |
Na
|
2500 ppb
max |
Manufacturer
Method |
Manufacturer
Method |
Zn
|
4000 ppb
max |
Manufacturer
Method |
Manufacturer
Method |
Storage:Stored in sealed container.
Packing: Plastic woven bag,NW: 25Kg/bag, Export
products: packed in cardboard drum, 25Kg/drum. |
