GB/T 1727-2021 English PDF (GBT1727-2021)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 1727-2021
Historical versions: GB/T 1727-2021
Preview True-PDF (Reload/Scroll if blank)

GB/T 1727-2021: General methods for preparation of coating films
GB/T 21241-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.35；71.100.40
Y 43
Toilet bowl and ceramic tile cleansers
卫生洁具清洗剂
ISSUED ON: DECEMBER 05, 2007
IMPLEMENTED ON: SEPTEMBER 01, 2008
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Product classification ... 5
4 Requirements ... 5
5 Test method ... 6
6 Inspection rules ... 9
7 Marking, packaging, transportation, storage ... 11
Toilet bowl and ceramic tile cleansers
1 Scope
This standard specifies the product classification, technical requirements, test methods,
inspection rules, marking, packaging, transportation, storage requirements of toilet
bowl and ceramic tile cleansers.
This standard applies to liquid detergents, which are compounded by inorganic acids,
organic acids, surfactants or other auxiliaries, as the main raw materials.
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 3810.13-2006 Test methods of ceramic tiles - Part 13: Determination of
chemical resistance (ISO 10545-13:1995, IDT)
GB/T 4100-2006 Ceramic tiles (ISO 13006:1998, MOD)
GB 9985-2000 Detergents for hand dishwashing
GB/T 13173.1 Method of sample division for detergents
GB/T 13173.2-2000 General specification for sweep signal generators
QB/T 2117-1995 General water-based metal detergents
QB/T 2739 Preparations of standard volumetric solutions of general test methods
for washing products
JJF 1070-2005 Rules of metrological testing for net quantity of products in
prepackages with fixed content
Order of the General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China [2005] No.75 "Measures for the
Supervision and Administration of the Measurement of Quantitative Packaged
Commodities"
3 Product classification
Toilet bowl and ceramic tile cleansers are divided into two types, according to the object
of use of the product:
Universal - It is suitable for cleaning all sanitary ware;
Special type for urinals and toilets - It is suitable for cleaning urinals and toilets.
4 Requirements
4.1 Material requirements
The biodegradability of various surfactants, which are used in sanitary ware cleaning
agents, shall not be less than 90%. It is recognized that the degradation is safe for the
environment (for example, tetra propylene alkyl benzene sulfonate, alkylphenol
polyoxyethylene ether shall not be used).
4.2 Sensory indicators
4.2.1 Appearance: Liquid product, homogeneous, without stratification, without
suspended solids or precipitation (except for products, to which uniform suspended
particle components are added).
4.2.2 Odor: There is no peculiar smell, AND it conforms to the specified fragrance type
(except for unflavored products).
4.2.3 Stability: Place it in a refrigerator at -5 °C ± 2 °C, for 24 h. Take it out and restore
it to room temperature. Make observation. There shall be no crystallization,
precipitation, discoloration. Place it in a thermostat at 40 °C ± 2 °C, for 24 h. Take out
for observation immediately. There shall be no delamination, discoloration, turbidity,
or change in smell.
Note: Stability means that there is no obvious change in appearance, before and after the sample
is tested.
4.3 Physical and chemical indicators
The physical and chemical indicators of sanitary ware's cleaning agent shall comply
with the provisions of Table 1.
Pour the sanitary ware's cleaning agent sample into a clean 60 mL glass ground-mouth
reagent bottle. Place it in an oven at 40 °C ± 2 °C. Take it out after 24 hours. Check the
appearance and smell immediately. Make judgement as required.
5.4 Determination of total acidity
5.4.1 Principle
Using phenolphthalein as an indicator; the specimen solution is titrated by sodium
hydroxide standard titration solution, until it turns reddish. The total acidity is
calculated, according to the consumption.
5.4.2 Reagents
a) Sodium hydroxide (GB/T 629), c(NaOH) = 0.2 mol/L standard titration solution;
b) Phenolphthalein (GB/T 10729), 10 g/L indicator solution.
5.4.3 Instruments
Common laboratory instruments and
a) Conical flask, 250 mL;
b) Burette without stopper, 50 mL.
5.4.4 Procedure
5.4.4.1 Determination
Mix the specimen uniformly. Weigh 2 g ~ 5 g (accurate to 0.001 g) into the conical flask
[5.4.3a)]. Add 30 mL of distilled water. Add 2 drops of phenolphthalein indicator
solution [5.4.2b)]. Shake well. Use burette [5.4.3b)] to titrate it, through sodium
hydroxide standard titration solution, to reddish, which is taken as the end point. It
keeps 30 s without fading.
5.4.4.2 Calculation of results
The total acidity is expressed by the mass fraction, X, of hydrochloric acid, which is
contained in each gram of the specimen, in %. It is calculated according to formula (1):
Where:
V - The volume of sodium hydroxide standard titration solution, which is consumed
in titration, in milliliters (mL);
c - The concentration of sodium hydroxide standard titration solution, in mole per
liter (mol/L);
m - The mass of the specimen, in grams (g).
For the results, take the arithmetic mean, which is rounded to one decimal place.
Precision: The absolute difference, between two independent test results, which are
obtained under repeatability conditions, is not greater than 5% of the arithmetic mean
of the two measured values.
5.5 Determination of surfactant content
In general, the total active content shall be measured, in accordance with the provisions
of 8.1 (Method A) in GB/T 13173.2-2000. When the product formula contains
surfactant components, that are insoluble in ethanol, OR it is stipulated in the order
contract of the customer that the test result of the total active content does not include
water cosolvent, AND it is required to be determined by the chloroform extraction
method, THEN, the total active content shall be determined according to A1, in
Appendix A of GB 9985-2000.
5.6 Determination of corrosivity
5.6.1 Determination of ceramic tile's corrosivity
Make measurement according to 8.1 of GB/T 3810.13-2006; the corrosion time is 4 h;
the original solution's temperature is 25 °C ± 2 °C. The ceramic tile, which is used for
the test, shall comply with the provisions of Appendix L in GB/T 4100-2006. It shall be
judged, according to 8.2 of GB/T 3810.13-2006. If the surface color does not change,
AND the HB pencil scratches can be wet-wiped off, THEN, it is judged as qualified.
5.6.2 Determination of corrosivity of metal test strip
The corrosion grade of Z30 cast iron and H62 brass shall be determined and graded
according to 5.6.5.2 in QB/T 2117-1995. The 1Cr18Ni9Ti stainless steel and
Cu/Ni10bCr chrome-plated brass shall be graded, according to the following criteria.
For urinal and toilet-specific products, soak them in a 3% 250 mg/kg hard water
solution at 25 °C ± 2 °C, for 30 minutes. For univer...