GB/T 21872-2008Sulphonic acid hardener for foundry no-bake furan resin (English PDF)

1 Scope

This standard specifies the casting self-hardening furan resin using a sulfonic acid type curing agent and the labeling of products, requirements, test methods, inspection rules, marks,

Packaging, transportation and storage.

This standard applies to toluene, xylene sulfonated obtained from casting furan resin with sulfonic acid curing agent.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent

Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research

Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB 190 packaging and marking of dangerous goods

GB/T 191 Packaging - Pictorial signs (GB/T 191-2008, ISO 780.1997, MOD)

GB/T 265 Petroleum products - Determination of kinematic viscosity and calculation of dynamic viscosity

Preparation of GB/T 601 chemical reagent standard titration solution

GB/T 603 chemical reagent test method Preparations of articles (GB/T 603-2002, ISO 6353-1 with. 1982,

NEQ)

Representation GB/T 1250 limit values and the method of determining

GB/T 4472-1984 Chemical density, relative density measurement General

GB/T 6678 General Principles for Sampling Chemical Products

GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987)

3 Model and labeling

Casting self-hardening furan resin with sulfonic acid curing agent are classified according to different temperature of the sand.

Model. GH01, GH02, GH03, GH04, GH05, GH06, GH07, GH08

Marked as follows.

Hardener

----

Sulfonic acid

XX Variety code (according to sand temperature varies from high to low temperature expressed in Arabic numerals)

Different types of curing agents shown in Table 1 Scope.

Table 1 different types of curing agents Scope

Model GH01 GH02 GH03 GH04 GH05 GH06 GH07 GH08

Applicable temperature range sand /

> 40 40 to 35 35 to 30 30 to 25 25 to 20 20 to 15 15 to 10 < 10

4 Requirements

Casting self-hardening furan resin with sulfonic acid curing agent shall comply with the technical requirements shown in Table 2.

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