Agar
Synonyms
Agar-agar;
Category
Polymer Surfactant
> Polysaccharide and its Derivatives
>> Anionic-type
>>> Anionic Polysaccharide and its Derivatives
Chemical Numbering System
CAS: 9002-18-0
EINECS: 232-658-1
Molecular Formula & Molecular Weight
Molecular Formula: N/A
Molecular Weight: N/A
Structure
Properties
Appearance (1), off-white to pale yellow solid.
Solubility soluble in hot water.
Stability stable.
Risk Solid form: flammable material; irritation, irritation to skin, eye, respiratory system. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
hamster oral LD50 |
6100mg/kg[1] |
|
mouse oral LD50 |
16000mg/kg[1] |
|
rabbit oral LD50 |
5800mg/kg[1] |
|
rat oral LD50 |
11000mg/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent film-forming, emulsifying, dispersing, lubricating, sustained-release abilities. Gel temperature: 35-40 °C. Almost no nutritional value. Characteristic reaction: purplish red with iodine.
Note (1), Ingredient description: complex water-soluble polysaccharide.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
90.0 |
Test Methods
(1), Actives
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Product standards
(1), Chinese standards
(1a), GB 1886.239 Food safety national standard -- Food additive -- Agar
(1b), Chinese Pharmacopoeia (2015 Edition) Agar
4, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
(b), Used in cosmetics, should be test for harmful substances or furtherly test for microorganisms, according to local regulations and standards.
Major Uses
1, Typical applications
Use as gel-forming agent.
Use as film-forming agent.
Use as thickening agent.
Use as slow-release agent.
Use as dispersing agent, emulsifying agent.
Use as adhesive.
Use as suspending agent.
2, Personal care products
Binding agent, masking agent, viscosity controlling agent in personal care products.
3, Medicine
Pharmaceutical excipient, use as suspending agent, sustained-release agent. (This section is for reference only, should be implemented according to local Pharmacopoeia.)
4, Food
Use as food additive (thickening agent).
5, Textile
Sizing agent in textile, silk.
6, Paper-making
Sizing agent in paper-making.
7, Biochemistry
Use as biological medium.
Manufacturers
References
[1]: ChemIDplus. 9002-18-0, Agar
Update: 20140911(1); 20200426(2);