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IMWITOR® 900 K
INCI/CTFA names:
IMWITOR® 491 Glyceryl Stearate
IMWITOR® 900 (F) P Glyceryl Stearate
IMWITOR® 900 K Glyceryl Stearate
IMWITOR® 960 K flakes Glyceryl Stearate SE
Product Description:
IMWITOR glycerylmonostearates are esters of the natural fatty acids stearic acid and palmitic acid with glycerin.
IMWITOR® 491 contains more than 90.0 % of monoglycerides (USP).
IMWITOR® 900 (F) P contains 40.0 – 55.0% of monoglycerides (corr. to type I, Ph.Eur. and USP).
IMWITOR® 900 K contains 40.0 – 55.0% of monoglycerides (corr. to type II, Ph.Eur. and USP).
IMWITOR® 960 K contains min. 30.0 % of monoglycerides and additionally approx. 5 % of alkaline stearate (selfemulsifying glycerinmonostearate, B.P.).
CHEMICAL PROPERTIES
Tests Unit(Method) IMWITOR® 491 IMWITOR®  900 (F) P IMWITOR® 900 K IMWITOR® 960 K
Saponification value mg KOH/g (a) 155 – 165 160 – 177 160 – 175 150 - 175
Acid value mg KOH/g (b) 3 Max 3 Max 3 Max 6 Max
Hydroxyl value mg KOH/g (c) 300 - 330 190 - 240 190 - 230
Iodine Value gI2/100 g (d) 3 Max 3 Max 3 Max 3 Max
Melting Point °C (e) 66 – 77 54 – 64 54 – 64 56 - 61
Free Glycerin %(f) 1.2 Max 2.5 Max 3 Max 7 Max
Water %(g) 1 Max* 1 Max 1 Max 2 Max
pH Value (h) 8 - 10
Ash %(i) 0.5 Max 1 Max 0.1 Max
Soap %(j) 6 Max
Arsenic ppm (k) 3 Max 3 Max 3 Max
Heavy metals ppm (l) 10 Max 10 Max 10 Max 10 Max
Heavy metals ppm (m) 1 Max 1 Max
Fatty acid C18 % (n) 40.0 – 60.0 60.0 – 80.0
∑ C16 + C18 % 90 Min 90 Min
Monoglyceride % (o) 90 Min 40.0 – 55.0 40.0 – 55.0 30 Min
Diglyceride % (o) 30 – 45 30 – 45
Triglyceride % (o) 5 – 15 5 – 15
Organic volatile impurities <467>USP complies complies complies complies
* Not included in CoA, limits are ensured
Methods Ph.Eur. 2.5.6; b) Ph.Eur. 2.5.1; c) Ph.Eur. 2.5.3; d) Ph.Eur. 2.5.4; e) Ph.Eur. 2.2.15; f) Ph.Eur.; g) Ph.Eur. 2.5.12; h) Ph.Eur. 2.2.3; i) Ph.Eur. 2.4.16; j) B.P.; k) Ph.Eur. 2.4.2; l) Ph.Eur. 2.4.8; m) Ph.Eur. 2.4.27; n) Ph.Eur.; o) Ph.Eur.
PROPERTIES:
White to light yellowish, solid, waxy masses, flaked or powdered, nearly neutral in odour and taste.
No additives or residues of antioxidants, stabilisers or solvents.
IMWITOR are insoluble in water, soluble in ethanol, acetone and fatty oils during heating.
High storage stability, no rancidity risk because free of unsaturated components.
Very good skin compatibility, even when ingested orally. Classified as GRAS (21 CFR § 184.1324 und 172.863) by the FDA.
APPLICATIONS
Glycerinmonostearates are broadly used in the pharmaceutical, cosmetic and food area. Because of their surface active properties they could function as follows:
Emulsifiers, co-emulsifiers, solubilizing agents, dispersing adjuvants, plasticizer, lubricants, consistency regulators, embedding agents, binders etc.
Delivery and Packaging:
IMWITOR® 491: Powder in paper bags with PE inliner, 25 kg net
IMWITOR® 900 (F) P and IMWITOR® 900 K: Powder in paper bags with PE inliner, 25 kg net
IMWITOR® 960 K: Flakes in paper bags with PE inliner, 25 kg net
Handling and Storage In tightly closed containers, dry, cool (< 25 °C) and protected from light. Under these conditions the shelf life of the products is at least three years.