GB/T 22053-2020Pentane vesicant (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 22053-2008 "Pentane vesicant". Compared with GB/T 22053-2008, in addition to editorial modifications, the main changes in content in this Standard are as follows:

- deleted models of F0, F1, F2, F9, F10 (see Table 1 of this Edition, Table 1 of Edition 2008);

- changed the adjustment range of the component content of each model from ±5% to ±2%; changed the total mass fraction of pentane from >=98% to >=99%; changed the mass fraction of heavy components C6 and above from <=1% to <=0.5%; changed the sulfur content from <=10µg/mL to <=5mg/kg; changed the evaporation residue from <=10mg/100mL to <=1mg/100mL; added the mass fraction of light component C4 and below, cyclopentane mass fraction, 2.2-dimethylpropane mass fraction, moisture index; deleted indexes of mechanical impurities and moisture, copper corrosion and water-soluble acid or alkali (see Table 2 of this Edition, Table 2 of Edition 2008);

- modified the test method for component content from SY/T 0542 to SH/T 0714, SH/T 1790; modified the test method for density from GB/T 1884 to GB/T 2013; added SH/T 0689 to the test method for sulfur content; added SH/T 0246 to the test method for moisture; modified the test method for bromine index from GB/T 11136 to SH/T 0630, SH/T 1551 (see Table 2 of this Edition, Clause 4 of Edition 2008);

- deleted type inspection; modified exit-factory inspection items (see 5.1 of this Edition, 5.1 of Edition 2008);

- modified sampling from SY/T 0543 to GB/T 4756 (see 5.3 of this Edition, 5.3 of Edition 2008).

1 Scope

This Standard specifies requirements and test methods, inspection rules as well as marks, packaging, transportation, storage requirements for pentane vesicant.

This Standard is applicable to pentane vesicant obtained by fractional distillation and refining of raw materials containing pentane. This product is mainly used as a vesicant in the production process of expandable polystyrene and flexible polyurethane. Molecular formula: C5H12.

Relative molecular mass: 72.15 (according to 2018 international relative atomic mass).

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB 190, Packing symbol of dangerous goods

GB/T 2013, Standard test method for density of liquid petrochemical products

GB/T 3209, Method for determining the amount of distillation residual of benzene - Type products

GB/T 4756, Method for manual sampling of petroleum liquids

GB/T 8170, Rules of rounding off for numerical values & expression and judgement of limiting values

NB/SH/T 0164, Packaging, storage, transportation and delivery acceptance

5 Inspection rules

6 Marks, packaging, transportation, storage