NATROSOL
Types, grades and specifications
 

 

The types of NATROSOL® hydroxyethylcellulose show aqueous solution viscosities which are proportional with their molecular weight. The viscosity types in which NATROSOL 250 is produced are listed in Table 1.

All types and grades of NATROSOL can be supplied with a treatment to provide fast dispersion and easy dissolving in water. These grades are marked with the letter R.

The medium-to-high viscosity types of NATROSOL 250 are also produced with a very low amount of unsubstituted anhydroglucose units. These types offer superior biostability, and are marked with the letter B. For example, NATROSOL 250 HBR. 

Most types of NATROSOL are supplied in the two particle sizes that are given below. 

If desired, the viscosity, particle size, and rate of dissolving can be varied to meet special requirements. 

NATROSOL has been specified in Product Data Sheet 33.015. 

Some viscosity types meet the specifications for hydroxyethylcellulose as set in the European Pharmacopoeia. These have been designated with the suffix “Pharm”. These types of NATROSOL- Pharm have been specified in Product Data Sheet 33.018.


Table 1
NATROSOL 250 - Limits of viscosity of aqueous solutions

Type

Concentration, %

Brookfield viscosity
at 25ºC, mPa.s

Typical Brookfield
viscosity at 2%
and 25ºC, mPa.s

HH

H

M
G
L

HHR
H4R
HR

MR
GR
LR

HHBR
H4BR
HBR
MHBR
MBR


1
1
1
1
2
2
5

3400 - 5500
2600 - 3300
1500 - 2500
1000 - 1500
4500 - 6500
  250 -   450
   100 -    180  

100 000
  50 000
  30 000
  15 000
    6 000
       350
         15

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