Pharmaceutical grade dimethicone polydimethylsiloxane cas9006-65-9 uses

Pharmaceutical grade dimethicone polydimethylsiloxane cas9006-65-9 uses polydimethylsiloxane, (Polydimethylsiloxane), is a hydrophobic silicone material
.

It has applications in various fields such as medicine, daily chemicals, food, construction, etc.
It has hundreds of derivatives.
The commonly used polysiloxanes are: polydimethylsiloxane, cyclomethylsiloxane , aminosiloxane, polysiloxane, polyether polysiloxane copolymer,
etc.

Among them, cyclopolydimethylsiloxane is a commonly used polysiloxane
.

[Check] Take 5ml of ethanol and 5ml of each for pH, shake well, add 1 drop of phenolphthalein indicator solution, dropwise add sodium hydroxide titration solution (0.
02mol/L) to a slightly pink color, add 1.
0g of this product, and shake well; if no If it is pink, add 0.
15ml of sulfuric acid titration solution (0.
01mol/L), and the pink color should disappear
.

Take this product from mineral oil, and compare the fluorescence intensity with the control solution (take quinine sulfate, dissolve and dilute with 0.
005mol/L sulfuric acid solution to make a solution containing 0.
1μg per 1ml) under ultraviolet light (365nm), and the fluorescence intensity shall not be deeper.

.

Take 5.
0g of this product for the phenyl compound, put it in a test tube with a stopper, add 10ml of cyclohexane precisely, shake it to dissolve, and measure the absorbance in the wavelength range of 250-270nm according to UV-Vis spectrophotometry (general rule 0401).
Must not exceed 0.
2
.

　　Loss on drying Take this product and place it in a metal dish, and dry it at 150°C for 2 hours.
The weight loss shall not exceed the limit specified in the attached table (General Rule 0831)
.

　　Take 1.
0g of this product for heavy metals, put it in a colorimetric tube, dissolve it and dilute it to 20ml, add 1.
0ml of the newly prepared 0.
002% dithizone solution, 0.
5ml of water and ammonia test solution-0.
2% hydroxylamine hydrochloride solution (1: 9) The mixed solution of 0.
5ml is used as the test solution
.

Another 20ml was placed in a colorimetric tube, and 0.
5ml of a mixed solution of 0.
002% dithizone solution 1.
0ml, standard lead solution 0.
5ml and ammonia test solution-0.
2% hydroxylamine hydrochloride solution (1:9) was added as control solution
.

Immediately shake the test solution and the control solution vigorously for 1 minute, and measure the absorbance at 523 nm according to UV-Vis spectrophotometry (general rule 0401).
The absorbance of the test solution should not be greater than that of the control solution (0.
0005%)
.

　　Arsenic salt take 1.
0g of this product, add 1.
0g of calcium hydroxide, mix, add a small amount of water, stir well, after drying, first burn with a small fire to carbonize, then burn at 500-600℃ to completely ashing, let it cool , add 5ml of hydrochloric acid and 23ml of water to dissolve, check according to the law (the first method of general rule 0822), and it should meet the regulations (0.
0002%)
.