Mixed C4

Item

Quality index

Test method

Density (15℃), kg/m³

Report

SH/T 0221^a

Vapor pressure (37.8℃), kPa no larger than

1380

GB/T 12576

Isobutene component content, percent (V/V)  no less than

Content of C5 and above, percent (V/V)  no larger than

30

3.0

SH/T0614

Residues

Evaporation residue, mL/100mL no larger than

Oil stain observation

0.05

Passed^c

SY/T 7509

Copper corrosion, level no higher than

1

SH/T 0232

Total sulfur content, mg/m³ no larger than

343

SH/T 0222

Free water

None

Visual inspection

a. The density can be calculated using the method in GB/T 12576 but is measured as stipulated in SH/T 0221 through arbitration.

b. According to the method in SY/T 7509, drop 0.3mL solvent residue mixture on filter paper with the increment of 0.1mL each time; after 2min, observe under daylight; if there is a lasting oil ring, this indicates passing.

c. Determine whether the test sample has free water using the visual method while measuring density.