HG/T 2765.4-2005Blue gel indicator, color changing silica gel and non-cobalt color changing silica gel (English PDF)

Foreword

This standard corresponds to the Russian National Standard TOCT 8984-75

(91) "Silica gel indicator" (Russian version). The degree of consistency between

this standard and TOCT 8984-75 (91) is non-equivalent. The main differences

are as follows:

- This standard specifies three varieties of blue gel indicator, color changing

silica gel, non-cobalt color changing silica gel. TOCT 8984-75 (91) does not

include color changing silica gel and non-cobalt color changing silica gel.

- ADD the indicators of abrasion rate and 120 °C loss on ignition; the purpose

is to ensure the service life of the product and the interests of users.

This standard replaces HG/T 2765.4-1996 "Silica gel - Blue gel indicator color

changing silica gel".

Compared with HG/T 2765.4-1996, the main changes of this standard are as

follows:

- ADD the variety of non-cobalt color changing silica gel (3.2 of this edition).

- CHANGE the batch size of products into no more than 5 tons (4.1 of the

1996 edition; 5.2 of this edition).

- ADJUST the packaging specifications (6.3 of the 1996 edition; 7.1 of this

edition).

HG/T 2765 is divided into several independent parts as follows:

HG/T 2765.1 Silica gel type A (Narrow pore silica gel)

HG/T 2765.2 Silica gel type C (Wide pore silica gel)

HG/T 2765.3 Micro-bead silica gel

HG/T 2765.4 Blue gel indicator color changing silica gel and non-cobalt color

changing silica gel

HG/T 2765.5 Test method for silica gel

HG/T 2765.6 Silica gel type B

Appendix A of this standard is an informative appendix.

This standard was proposed by the China Petroleum and Chemical Industry

Association.

Blue gel indicator, color changing silica gel and non-

cobalt color changing silica gel

1 Scope

This standard specifies the requirements, test methods, inspection rules,

markings, labels, packaging, transportation, storage of blue gel indicator, color

changing silica gel, non-cobalt color changing silica gel.

This standard applies to blue gel indicator, color changing silica gel, non-cobalt

color changing silica gel, which is prepared, using the silica gel as the raw

materials, through impregnation with cobalt chloride. Blue gel indicator is mainly

used to indicate the degree of saturation of desiccant, the relative humidity of

the sealed package and the space medium in precision instruments. The color

changing silica gel is mainly used as a desiccant and indicator, which is used

to prevent moisture in general sealed packages and instruments. Non-cobalt

color changing silica gel can usually be used as a substitute for blue gel

indicator and color changing silica gel.

2 Normative references

The provisions in following documents become the provisions of this Standard

through reference in this Standard. For the dated references, the subsequent

amendments (excluding corrections) or revisions do not apply to this Standard;

however, parties who reach an agreement based on this Standard are

encouraged to study if the latest versions of these documents are applicable.

For undated references, the latest edition of the referenced document applies.

GB/T 191-2000 Packaging - Pictorial marking for handling of goods (eqv ISO

780:1997)

GB/T 1250 Rules for expression and judgement of limiting values

GB/T 6678 General principles for sampling chemical products

HG/T 2765.5-2005 Test method for silica gel

3 Requirements

5 Inspection rules

6 Markings and labels