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HYDROXY PROPYL METHYL CELLULOSE(HPMC)

1. Degree of polymerization; R:-H,-CH3 or CH2CHOHCH3

2. Technical Index:

     Quality index

Type (gelation temperature)

60

65

75

Item

Methoxyl

28-30%

27-30%

19-24%

Hydroxypropyl

7-12%

4-7.5%

4-12%

Gelatification temperature

58-64

62-68

70-90

Moisture

<5%

Ash

<1%

PH (1% solution, 25)

4-8

 

3. PROPERTIES:

  • Appearance white or off-white powder.
  • Particle size: through put efficiency of above 98.5% in 100 mesh, and 100% in 80 mesh.
  • Carbonization temperature: 280-3000C
  • Apparent density: 0.25-0.70g.cm3(usually about 0.5g/cm3), specific gravity:1.26-1.31.
  • Color degradation temperature: 190-2000C
  • Surface tension: 42-56dyn/cn(2% aqueous solution is of surface tension, high transparency and stable property. The solubility with the viscosity, the lower the viscosity is, the higher solubility it has. The different HPMC is different is some properties and its solubility in water is not affected by pH
  • The lower methoxyl content in HPMC, the higher gelatification temperature, the lower solubility in water and surface activity.
  • HPMC has also other characteristic such as thickening property, pH stability, water retention, excellent film-forming property and good disperse and adhesion power.

 

4.USAGE:

HPMC is mainly used as dispersant in the production of PVC and as thickener, stabilizer,

emulsifier, excipient, water retention agent, film-forming agent in petrochemical, building

materials, Skim Coat(Whie cement based putty) agrochemical, ink, printing and dyeing of textile, paper making, cosmetics, etc.

 

5. PACKAGE AND STORAGE:

Sealed in the plastic-plated polypropylene woven bag, net weight:25 Kg. Keep away

from sun, rain and moisture during storage.

Viscosity specification

Type

Specification

Range, mpa.s

special low viscosity

5

3-7

10

8-12

15

13-18

low viscosity

25

20-30

50

40-60

100

80-120

high viscosity

4000

3500-5600

12000

10000-14000

special high viscosity

20000

17000-22000

25000

22000-28000

30000

27000-32000

40000

37000-42000

50000

47000-52000

60000

57000-62000

75000

72000-78000

100000

80000-100000

 

Note: 2% aqueous solution at 200C