GB/T 21241-2022 PDF in English
GB/T 21241-2022 (GB/T21241-2022, GBT 21241-2022, GBT21241-2022)
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| GB/T 21241-2022 | English | 80 |
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Toilet bowl and ceramic tile cleansers
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| GB/T 21241-2007 | English | 105 |
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Standards related to (historical): GB/T 21241-2022
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GB/T 21241-2022: PDF in English (GBT 21241-2022) GB/T 21241-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.40
CCS Y 43
Replacing GB/T 21241-2007
Toilet bowl and ceramic tile cleansers
卫生洁具清洗剂
ISSUED ON: DECEMBER 30, 2022
IMPLEMENTED ON: JULY 01, 2023
Issued by: State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Product categories ... 6
5 Requirements ... 6
6 Test methods ... 7
7 Inspection rules ... 10
8 Marking, packaging, transportation, storage ... 10
Foreword
This document is drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 21241-2007 "Toilet bowl and ceramic tile cleansers".
Compared with GB/T 21241-2007, in addition to structural adjustments and editorial
changes, the main technical changes are as follows:
a) CHANGE the basic requirements (see 5.1; 4.1 of the 2007 edition);
b) CHANGE the appearance and stability item requirements (see 5.2; 4.2 of the 2007
edition);
c) CHANGE the name of the surfactant content item (see 5.3; 4.3 of the 2007 edition);
d) CHANGE the requirements for corrosive items (see 5.3; 4.3 of the 2007 edition);
e) ADD the total phosphorus pentoxide content items, requirements, detection
methods (see 5.3 and 6.8);
f) ADD the remarks on the total acidity weighing quantity (see 6.5.4.1);
g) CHANGE the expression of results of total acidity (see 6.5.4.2; 5.4.4.2 of the 2007
edition);
h) CHANGE the basis for the detection method of total effective substance content
(see 6.6; 5.5 of the 2007 edition);
i) CHANGE the description of corrosion testing (see 6.7; 5.6 of the 2007 edition);
j) CHANGE the inspection rules (see Chapter 7; Chapter 6 of the 2007 edition);
k) CHANGE the marking requirements (see 8.1; 7.1 of the 2007 edition);
l) CHANGE the packaging requirements (see 8.2; 7.2 of the 2007 edition);
m) DELETE the corrosion requirements and test methods for cast iron (see 4.3 and
5.6.2 of the 2007 edition);
n) DELETE the quantitative packaging requirements (see 4.4 of the 2007 edition);
o) DELETE the shelf life requirement (see 7.4.3 of the 2007 edition).
Please note that some content in this document may be subject to patents. The publisher
of this document assumes no responsibility for identifying patents.
Toilet bowl and ceramic tile cleansers
1 Scope
This document stipulates the classification, requirements, test methods, inspection rules
and marking, packaging, transportation, storage of toilet bowl and ceramic tile cleansers.
This document is applicable to the production and testing of liquid, paste, gel sanitary
ware cleaning products, that are composed of inorganic acids, organic acids, surfactants
or other auxiliaries as the main raw materials.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB/T 3810.13-2016 Test methods of ceramic tiles - Part 13: Determination of
chemical resistance
GB/T 4100-2015 Ceramic tiles
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 13173-2021 Surface active agents - Test methods for detergents
GB/T 26396 Technical specification for safety of soaps and detergents
GB/T 36970 Instruction for use of consumer products - Labelling for detergents
QB/T 2117-1995 General water-based metal detergents
QB/T 2739 Preparations of standard volumetric solutions of general test methods
for washing products
QB/T 2951 Inspecting rules for detergent products
QB/T 2952 Requirements for detergent marks and packaging
Using phenolphthalein as an indicator, titrate the specimen solution with sodium
hydroxide standard titration solution until it appears reddish. Calculate the total acidity
based on the consumption.
6.5.2 Reagents
6.5.2.1 Sodium hydroxide, c(NaOH) = 0.2 mol/L standard titration solution.
6.5.2.2 Phenolphthalein, 10 g/L indicator solution.
6.5.3 Instruments
6.5.3.1 Erlenmeyer flask, 250 mL.
6.5.3.2 Stopperless alkaline burette, 50 mL.
6.5.4 Procedure
6.5.4.1 Determination
Mix the specimen evenly. Weigh 2 g ~ 5 g (accurate to 0.001 g) into an Erlenmeyer
flask (6.5.3.1). Add 30 mL of distilled water. Add 2 drops of phenolphthalein indicator
solution (6.5.2.2). Shake well. Use the burette (6.5.3.2), to titrate it, using sodium
hydroxide standard titration solution (6.5.2.1), until it is reddish, which is taken as the
end point. Keep 30 s without fading.
Note: The sample volume can be adjusted symmetrically according to the content.
6.5.4.2 Result calculation
The total acidity is expressed by the mass fraction w of HCl contained in each gram of
specimen, which is calculated according to formula (1):
Where:
c - Concentration of standard titration solution of sodium hydroxide, in moles per
liter (mol/L);
V - Volume of sodium hydroxide standard titration solution consumed in the titration,
in milliliters (mL);
m - Mass of the specimen, in grams (g).
The results are rounded to the nearest integer using the arithmetic mean.
Precision: The absolute difference between two independent test results obtained under
repeated conditions is not greater than 5% of the arithmetic mean of the two measured
values, provided that the absolute difference is not greater than 5% if it is greater than
5%.
6.6 Total effective substance content
If there are no special instructions, the provisions of 7.4.1 in GB/T 13173-2021 shall be
followed.
6.7 Corrosiveness
6.7.1 Ceramic tile corrosiveness
The measurement is carried out according to the test method of 8.1 in GB/T 3810.13-
2016. The corrosion time is 4 h. The liquid concentration of the test sample is the
original solution. The test device is kept at a temperature of (25 ± 2) °C. The ceramic
tiles used for the test shall be glazed tiles specified in Appendix L of GB/T 4100-2015.
In order to determine the applicability of the pencil test, use an HB pencil to draw
several line marks on the untreated part of the glaze. If the line marks can be rubbed off
using a damp cloth, it can be used as the test glazed tile sample for testing. However, if
it cannot be wiped off, re-select the glazed tile for testing. Use the methods 8.2.2.1 and
8.2.2.2 in GB/T 3810.13-2016 to make determination. If there is no visible change on
the surface, meanwhile the HB pencil mark can be rubbed off using a damp cloth, it is
judged as qualified.
6.7.2 Corrosion of metal test pieces
The corrosion resistance of 1Cr18Ni9Ti stainless steel, H62 brass, Cu/Ni10bCr brass
chromium plating is measured according to QB/T 2117-1995; H62 brass is rated
according to 5.6.5.2 in QB/T 2117-1995; 1Cr18Ni9Ti stainless steel and Cu/Ni10bCr
brass chromium plating are rated according to the following criteria.
Soak the general-purpose cleaning agent in the original solution at (25 ± 2) °C for 30
minutes. If necessary, heat the water bath to maintain the solution temperature at (25 ±
2) °C.
1Cr18Ni9Ti stainless steel and Cu/Ni10bCr brass chromium plating (specimen
comparison before corrosion):
Level 0 - As bright as ever;
Level 1 - Uniform and slight discoloration;
Grade 2 - Visible discoloration;
Grade 3 - Severe and obvious discoloration or corrosion.
6.8 Total phosphorus pentoxide content
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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