'HE' dyes are Reactive Dyes for cellulosic material and are designed to give high fixation by exhaust dyeing methods when applied at the temperature 75°C- 90°C. 'HE' dyes are suitable for dyeing on cotton and other cellulosic materials. These dyes have significantly higher exhaustion and fixation efficiency which result in appreciable cost reduction, in comparison to conventional reactive dyes. 
Some advantages of 'HE' dyes have :-
1. Excellent compatibility. 
2. Good built up. 
3. Excellent Reproducibility. 
4. Wide Applicability. 
5. Outstanding built up and consistency. 
6. Good over all colorfastness properties. 
Key to  Abbreviations
ND = Non Dischargeable
D = Dischargeable
G = Good
M = Medium
F = Fair
P = Poor
S = Suitable
NS = Non Suitable
L = Less Suitable