Test items

Standard requirements

Test results

Appearance

White or nearly white, translucent, soft and greasy lumps, slightly fluorescent when melted in sunlight

Meet the requirements

Cone penetration (0.1mm)

130-230

145

pH

Add 1 drop of phenolphthalein indicator solution, it should be colorless; add 0.10ml of methyl orange indicator solution, it should not turn pink

Meet the requirements

Color

Compared with the same volume of control solution (take 0.2ml of copper sulfate solution for colorimetry and 7.8ml of potassium dichromate solution for colorimetry, mix well, take 2.5ml of the mixed solution, and add water to 25mm), it shall not be darker.

Meet the requirements

Absorbance of impurities (290nm)

The absorbance should not exceed 0.50

0.35

Sulfide

Should comply with regulations (0.00017%)

Not detected

Organic acid

Add 1 ml of phenolphthalein indicator solution and 0.40 ml of sodium hydroxide titration solution (0.1 mol/l), stir vigorously, and a red color should appear.

Meet the requirements

Heterotropic organic matter and ignition residue

The residual residue shall not exceed 0.05%

0.03%

Fixed oil, fat and rosin

Add 50 ml of 5 mol/L sodium hydroxide solution, place in a water bath for 30 minutes, separate the aqueous layer, and acidify with 2.5 mol/L sulfuric acid solution. No oil or solid matter should be generated.

Meet the requirements

Heavy metals

The content of heavy metals shall not exceed 30 parts per million

15 parts per million

Arsenic salts

Should comply with regulations (0.0002%)

Not detected

Polycyclic aromatic hydrocarbons

The absorbance of the test solution is measured in the range of 260-420nm, and its maximum value shall not exceed the absorbance value of the control solution at a wavelength of 278nm.

Meet the requirements

Test results