Gum Arabic grades and types: - 

Grade 1: Acacia Senegal (Hashab) is sorted to the following types: - 

Hand Picked Selected (HPS): The cleanest type, lightest colour and in form of large nodules. 
Cleaned: Contains siftings and without dust. 
Siftings: Fine particles remaining following sorting of the choicer grades. Contains some bark, sand and few dirt. 
Dust: very small particles collected after cleaning process but contains dirt and sand. 

Grade 2: Acacia Seyal (Talha) is sorted to the following types: - 
Cleaned: size (starts from 4mm and above) 
Sifting: size (0.5mm to 4mm) 
Dust: size (max. 0.5mm) 
Specification of Gum Arabic (Hashab): 
Solubility: highly soluble in water, give up to 50% 
Moisture: max. 15% 
Hydrolysis products: passes test 
Total ash: max 4% 
Viscosity: 70 ~ 110 mpsc 
Ph: 4.2 ~ 4.8 
Tannin test: passes test 
Starch and dextrin: Passes Test 
Nitrogen content: 0.24 ~ 0.41% 
Protein content: 1.58 ~ 2.7% (N x 6.6) 

Specification of Gum Arabic (Talha): 
Moisture: max. 15% 
Hydrolysis products: passes test 
Total ash: max 4% 
Viscosity: 60 ~ 110 mpsc 
Ph: 4.2 to 4.8 
Color of 20% solution: Lt. Amber 
Acid Insoluble Residue: max 0.35% 
Specific Rotation: (oc) D 25c (-22) ~ (-34)