TEST ITEMS

QUALITY  INDEX

TEST  RESULT

TEST  METHOD

isobutane               %

≥99.5

99.6872

SH/T0230-92

total sulfur              ug/ml

≤1.0

≤1.0

SY/T7508—97

residue              ml/100ml

≤0.01

0.004

SY/TT7509—96

Saturation vapor pressure    %

≤1.5

0.75

TCD

Water content            %

≤0.002

  0.0008

GB/T6023-1999

Acid                    %

≤0.0001

Nile

PH

Appearance

Colorless and clear

Colorless and clear

Ocular estimate

odor

Odorless

Odorless

Olfactory assessment