Valid

GB/T 6287-2021Determination of static adsorbed water for molecular sieve (English PDF)

分子筛静态水吸附测定方法

Preview PDF

This is a limited preview

Buy now to download the full PDF (15 pages)

Need quotation for your management?

Get a formal quotation for GB/T 6287-2021 in 30 minutes.

Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 20, 2021

Implementation date

March 1, 2022

Scope

GB/T 6287-2021 is the English-translated version of 分子筛静态水吸附测定方法.

GB/T 6287-2021 gives two methods for determining the static water adsorption of molecular sieves: the saturated sodium chloride solution method and the vacuum adsorption method.

It applies to granular and powdered molecular sieves of all kinds, and defines static water adsorption capacity as the mass of water taken up per unit mass of sieve after long contact with water vapour in a closed container.

In the first method the sample is kept in a closed container over saturated sodium chloride solution at a controlled temperature, and the gain in mass is weighed; the standard specifies the reagents, samples, equipment such as a blast drying oven, the procedure and the precision.

It also sets the content of the test report. It replaces GB/T 6287-1986, was issued on 20 August 2021 and has applied since 1 March 2022.

Found what you need?

Document preview — GB/T 6287-2021

National Standard of the People's Republic of China

ICS: 71.100.99
Classification: G 85
Replacing: GB/T 6287-1986

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Saturated sodium chloride solution method

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 6287-1986 "Molecular Sieve Static Water Adsorption Determination Method", compared with GB/T 6287-1986, except for the structure In addition to adjustments and editorial changes, the main technical changes are as follows.

a) The requirements for reagents or materials and samples for the saturated sodium chloride solution method have been added (see 4.2 and 4.4);

b) The equipment requirements and test procedures of the saturated sodium chloride solution method are refined (see 4.3 and 4.5, Chapter 2 and Chapter 3);

c) Modified the precision requirements of the saturated sodium chloride solution method (see 4.7, 4.2 of the 1986 edition);

d) The test method of vacuum adsorption method has been added (see Chapter 5);

e) The requirements for test reports have been added (see Chapter 6).

1 Scope

This document describes the saturated sodium chloride solution method and the vacuum adsorption method for molecular sieve static water adsorption determination.

This document is applicable to the determination of static water adsorption of various granular and powdered molecular sieves.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 6678 General Rules for Sampling of Chemical Products

GB/T 6682 Analytical laboratory water specifications and test methods

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Static water adsorption capacity

After a certain amount of molecular sieve reaches equilibrium in a closed container with a certain concentration of water after a long period of full contact, the unit mass The mass of water absorbed by the molecular sieve.

4 Saturated sodium chloride solution method

4.1 Principle

The saturated vapor pressure of saturated sodium chloride solution is stable under certain temperature conditions.

In a closed container, after adsorbing for a long enough time under certain temperature conditions, weigh the increase in the mass of the sample, and calculate the static water absorption Attached amount.

4.2 Reagents or materials

Unless otherwise stated, only use analytical reagents.

Saturated sodium chloride solution. Dissolve analytically pure sodium chloride in water until it is saturated. The solution should contain obvious undissolved sodium chloride crystals. Place The water used should conform to the third grade water specified in GB/T 6682.

4.3 Equipment

4.3.1 Blast drying oven. the working room is not less than 350mm×450mm×450mm, and the temperature difference is not more than ±1°C.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Cited by

Similar standards

GB/T 14022-2026|GB/T 1926-2026|GB/T 34701-2026|GB/T 35209-2026|GB/T 31590-2025|GB/T 46393-2025

Editions of GB/T 6287

Edition	Title	Revision	Status
GB/T 6287-2021	Determination of static adsorbed water for molecular sieve	current edition	Current
GB/T 6287-1986	Determination of static adsorbed water for molecular sieve	previous edition	Superseded

This page sells the current edition, GB/T 6287-2021. Earlier editions are listed for reference only.

How to Download GB/T 6287-2021

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.