Optical brighteners, also known as fluorescent whitening agents (FWAs) or optical brightening agents (OBAs), are chemical compounds used in various industries, primarily in textiles, paper, and detergents. These substances absorb ultraviolet (UV) light and re-emit it as visible blue light, making colors and whites appear brighter and more vivid. Optical brighteners are often added to laundry detergents to give the illusion of cleaner and whiter clothing by enhancing their visual brightness. They are also used in the paper industry to improve the brightness and whiteness of paper products. Optical brighteners' ability to improve the appearance of materials under certain lighting conditions makes them valuable in enhancing the visual quality of a wide range of consumer and industrial products.
Product Feature
Odor: Slight irritative.
Specific Gravity: Unavailable
Solubility: Soluble in water.
Density: 2.19
pH: 6-7
pH Test-Method: PH test paper.
% Volatiles by volume @ 21C (70F): 0
Boiling Point: Not applicable.
Melting Point: >300 C Decomposes.
Vapor Pressure (mm Hg): No information found.
Bulk Density: ~0.9
Evaporation Rate (BuAc=1): No information found.
Application
1. Widely used in textile industry for vat dyeing, reduction cleaning, printing and stripping, textile textile bleaching .
2. bleaching paper pulps , especially mechanical pulps, its the most fittable bleaching agent in pulps.
3. bleaching kaolin clay, fur bleaching and reductive whitening, bleaching of bamboo products and straw products,
4. in mineral, the compound of thiourea and other sulphides.
5. as reducing agent in chemical industry.
6. Sodium hydrosulfite food additive grade is used in foodstuffs, as bleaching agent and preservative dried fruits, dried vegetable, vermicelli, glucose, sugar, rock sugar, caramel, candy, liquid glucose, bamboo shoots, mushrooms and canned mushrooms.
Packaging 50kg/100kg net in iron drums with double PVC bags
Product Specification/Models
NDEX 90%, 88%, 85%. FOOD ADDITIVE
Na2S2O4, 90%, 88%, 85%, Fe 20ppm ZincZnOther heavy metal
calculated as Pb, 1ppm
Water Insolubles05%
Shelf Life(month)12
Chemical name: 4,4-Diaminostilbene-2,2-disulfonic acid
Chemical formula: C14H14N2O6S2
Molecular weight: 370.4
CAS NO.:81-11-8
Property: 1)Light yellow cream or powder, soluble in ethanol and ether; insoluble in water, easily soluble in alkaline solution. 2)Can be easily oxidized into red; has the property of aromatic acid or aromatic amine
Quality index:
Item Index
(1)Appearance dry/wet light yellow powder/light yellow cream
(2)Dry product total amino value(gross dry sample)% 95.0
(3)Degree of pigmentation(EOD) 0.12
(4)Content of alkali insolubles (gross cream )% 0.08
(5)Benzyl compound(gross sample)% 0.25
(6)Ash content% 2.2.
Dry product: in 25kg woven bags or upon clients' request; wet product: in 40kg woven bag or upon clients' request.
Chemical name: p-nitrotoluene-o-sulfonic acid Structural formula:
Chemical formula: C7H11NO7S
Molecular weight: 253
CAS NO.:121-03-9
Quality index:
Item Index
(1)Appearance milk white crystal
(2)Assay (Gross sample)% 80.0
(3)Moisture (Gross sample)% 5.0
(4)Free acid (Gross sample)% 1.0
(5)Insolubles(Gross sample% 0.1
Main use: it is an intermediate of dyes, can be used to manufacture Yellow R.
Chemical Name: Sulfanilic acid
Structural Formula:
Chemical Formula: C6H7NO3S
Molecular Weight: 173.18648
CAS NO.: 121-57-3
Product Index:
Item Index
1. Appearance White to grey white powder
2. Purity (total amino value) 99.0%
3. Density 1.485g/cm3
4. Fusion Point 285C
5. Water-solubility 0.1 g/100 mL.
Main use: for azo dyes manufacturing, also for agricultural chemicals to prevent wheat rust.
