JC/T 764-2008WC seats (English PDF)
坐便器圈和盖
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Issued by
National Development and Reform Commission of PRC
Level / Type
National · Recommended
Issue date
June 16, 2008
Implementation date
December 1, 2008
Scope
JC/T 764-2008 is the English-translated version of 坐便器圈和盖.
JC/T 764-2008 — This standard specifies the terms and definitions, classification, requirements, test methods, inspection rules, markings, operation instructions, packaging, transportation and storage of WC seats.
This standard is applicable to the WC seats which are made of plastic, wood, composite materials, resin and other materials, installed on the surface of the pedestal pan, are comfortable, hygienic and beautiful (hereinafter referred to as the WC seats).
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Document preview — JC/T 764-2008
National Standard of the People's Republic of China
- ICS
- 91.140.70
- Classification
- Q 31
Issued by: National Development and Reform Commission of PRC
Contents
- Foreword...3
- 1 Scope...5
- 2 Normative references...5
- 3 Terms and definitions...5
- 4 Classification...8
- 5 Requirements...8
- 6 Test methods...13
- 7 Inspection rules...18
- 8 Marking, product's operation instruction...20
- 9 Packaging, transportation and storage...20
- Appendix A (Normative) Swing test...21
- Appendix B (Normative) Test of stain-resistance...23
Foreword
This standard modifies and adopts the American Standard ANSI Z 124.5-1997
"WC plastic seats".
This standard is a revision of JC/T 764-2001 "WC plastic seats".
The main differences between this standard and ANSI Z 124.5-1997 are as
follows.
- ADD the special performance requirements and test methods for WC seats
which are made wood, composite materials, resins, etc.;
- ADD the definitions, technical requirements and test methods for soft close
seats;
- ADD the requirements for static load, moisture-resistance and cold-hot
fatigue;
- Unrecoverable bending is subject to common requirements.
The main changes of this standard as compared with JC/T 764-2001 are as
follows.
- ADD the requirements for dimension and test methods;
- ADD the technical requirements and test methods for soft close WC seats;
- ADD the special performance requirements and test methods for WC seats
which are made of wood, composite materials, resins, etc.;
- CANCEL the public and household categories of unrecoverable bending,
the technical requirements are the same as the original public category;
- ADD the requirements for static load, moisture-resistance, and cold-hot
fatigue.
Appendix A and Appendix B of this standard are normative appendixes.
This standard replaces JC/T 764-2001 from the date of implementation.
1 Scope
This standard specifies the terms and definitions, classification, requirements,
test methods, inspection rules, markings, operation instructions, packaging,
transportation and storage of WC seats.
This standard is applicable to the WC seats which are made of plastic, wood,
composite materials, resin and other materials, installed on the surface of the
pedestal pan, are comfortable, hygienic and beautiful (hereinafter referred to as
the WC seats).
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 2829 Sampling procedures and tables for periodic inspection by
attributes (Apply to inspection of process stability)
GB/T 4892 Dimensions of rigid rectangular packages - Transport packages
GB/T 6388 Transport packaging - Marking for receipt and delivery
GB/T 6461 Methods for corrosion testing of metallic and other inorganic
coatings on metallic substrates - Rating of test specimens and manufactured
articles subjected to corrosion tests
GB/T 6739 Paints and varnishes - Determination of film hardness by pencil
test
GB/T 9286 Paints and varnishes - Cross cut test for films
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Chipped areas
More than two surface damages >= 0.4 mm.
3.2
Blister or void
The portion of surface break when using a 13 mm diameter nylon rod to
manually apply pressure to 44.5 N.
3.3
Surface porosity
The holes on the surface which do not penetrate the base material.
3.4
Molding irregularity
Any visible defects associated with molding, such as corrugations, dome,
missing material, flash or dents. Weld marks and sprues are not considered
to be molding irregularity.
3.5
Pit
A small pit of approximately equal width and depth on the surface.
3.6
Pinhole
A small hole on the surface that does not exceed 0.4 mm in diameter.
3.7
Speck
The different color at surface which is generated by the foreign particles, the
maximum size of the speck is 0.7 mm. It does not include specks or mixed
specks that produce a decorative pattern on the surface.
4 Classification
4.1 In accordance with the material, it is divided into plastic, wood, composite
and resin products.
5 Requirements
5.1 Size
5.1.1 The allowable deviation of the dimensions as shown in Figure 1 is <= ± 3
mm;
5.1.2 Bumper height >= 1.6 mm.
5.2 Surface quality
The product surface is divided as follows.
5.2.2 The surface quality of the wood seat and cover shall comply with the
requirements of Table 2.
5.2.3 The surface quality of the composite seat and cover shall comply with the
requirements of Table 3.
5.5.4 Coating hardness
The coated seat and cover have a coating hardness of not less than 2 B.
5.5.5 Coating adhesion
The coated seat and cover have a coating adhesion of not more than grade 2.
5.5.6 Color fastness
Colored seats and covers shall be free of stains.
5.5.7 Moisture-resistance
Except for the thermoplastic seat and cover, the other seat and cover shall, after
the test, comply with the requirements of 5.1.1, the surface quality shall comply
with the requirements of 5.2.
5.5.8 Cold-hot fatigue
After the test, it shall comply with the requirements of 5.1.1 and 5.3.2.
6 Test methods
The following tests of 6.1 and 6.4 ~ 6.13 shall be carried out at an ambient
temperature of 22 °C ± 3 °C.
6.1 Measurement method of dimension
The dimensions are measured by a ruler which has a division value of 1 mm
and an I-square which has a division value of 1°.
6.2 Inspection of surface quality
First use standard detergent and water to wash the seat and cover, let it dry
naturally or otherwise use a clean, absorbent, lint-free material to wipe it dry.
Use a sponge which has dipped the 50% aqueous solution of ink to wipe its
surface, then use tap water to rinse the mark of ink and let it dry naturally.
6.3 Lean-back test
Install the seat and cover on the test platform in the use state, turn the seat and
cover to fully open it, measure the angle with the horizontal plane and record it
(see Figure 3).
6.4 Measurement of warpage
Install the seat and cover on the test platform in the use state. The contact
surface between the test platform and the seat are the same as in the use state.
Lower down the seat and cover, use a feeler gauge which has a division value
of 0.1 mm or an equivalent measuring instrument, to respectively measure the
maximum clearance between the cover's bumper and the seat as well as the
maximum clearance between the seat's bumper and the test platform.
6.7 Swing test
Make inspection in accordance with the provisions of Appendix A.
6.8 Test of bolt and nut's torque
Use metal nuts, bolts, etc. to fix the test bolts and nuts in the holes of the test
torque bench, use the torque wrench to determine the torque. The bolt torque
test is as shown in Figure 5, the nut torque test is as shown in Figure 6.
6.9 Impact test
Let a steel ball which has a diameter of 38 mm and a mass of 0.225 kg freely
fall from a height of 455 mm, onto the center of the cover, the front center of the
seat, and the center of the middle of seat, respectively. The impact position is
as shown in Figure 7.After the impact is completed, check it in accordance with
6.2.
7 Inspection rules
7.1 Inspection classification
Product inspection includes exit-factory inspection and type inspection.
7.2 Exit-factory inspection
Exit-factory inspection items include size, surface quality, processing and
assembly.
7.3 Type inspection
Type inspection includes all items required by this standard. Under normal
circumstances, type inspection is carried out at least once a year.
Type inspection shall also be carried out in one of the following cases.
7.3.1 Batch-group rule and sampling plan
Every 200 sets ~ 1000 sets of products of the same type and the same grade
form a batch, those less than 200 sets are also considered as a batch. The
sampling plan is carried out in accordance with the provisions of GB/T 2829,
use the decision level I and the once sampling plan.
8 Marking, product's operation instruction
8.1 Each product shall have an obvious registered trademark with a certificate
of conformity and operation instructions for installation and use.
8.2 The single package of product shall be marked with the name of
manufacturer, the address of manufacturer, the product name, the date of
manufacture, the registered trademark.
9 Packaging, transportation and storage
9.1 Each set of products shall be packaged separately, to ensure no collision
between products. The package dimensions and markings are carried out in
accordance with the provisions of GB/T 4892 and GB/T 6388.
JC/T 764-2008
JC
BUILDING MATERIAL INDUSTRY STANDARD
ICS 91.140.70
Q 31
Registration number. 24229-2008
Replacing JC/T 764-2001
WC seats
Issued on. JUNE 16, 2008
Implemented on. DECEMBER 01, 2008
Issued by. National Development and Reform Commission of PRC
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Classification... 8
5 Requirements... 8
6 Test methods... 13
7 Inspection rules... 18
8 Marking, product's operation instruction... 20
9 Packaging, transportation and storage... 20
Appendix A (Normative) Swing test... 21
Appendix B (Normative) Test of stain-resistance... 23
Foreword
This standard modifies and adopts the American Standard ANSI Z 124.5-1997
"WC plastic seats".
This standard is a revision of JC/T 764-2001 "WC plastic seats".
The main differences between this standard and ANSI Z 124.5-1997 are as
follows.
- ADD the special performance requirements and test methods for WC seats
which are made wood, composite materials, resins, etc.;
- ADD the definitions, technical requirements and test methods for soft close
seats;
- ADD the requirements for static load, moisture-resistance and cold-hot
fatigue;
- Unrecoverable bending is subject to common requirements.
The main changes of this standard as compared with JC/T 764-2001 are as
follows.
- ADD the requirements for dimension and test methods;
- ADD the technical requirements and test methods for soft close WC seats;
- ADD the special performance requirements and test methods for WC seats
which are made of wood, composite materials, resins, etc.;
- CANCEL the public and household categories of unrecoverable bending,
the technical requirements are the same as the original public category;
- ADD the requirements for static load, moisture-resistance, and cold-hot
fatigue.
Appendix A and Appendix B of this standard are normative appendixes.
This standard replaces JC/T 764-2001 from the date of implementation.
1 Scope
This standard specifies the terms and definitions, classification, requirements,
test methods, inspection rules, markings, operation instructions, packaging,
transportation and storage of WC seats.
This standard is applicable to the WC seats which are made of plastic, wood,
composite materials, resin and other materials, installed on the surface of the
pedestal pan, are comfortable, hygienic and beautiful (hereinafter referred to as
the WC seats).
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 2829 Sampling procedures and tables for periodic inspection by
attributes (Apply to inspection of process stability)
GB/T 4892 Dimensions of rigid rectangular packages - Transport packages
GB/T 6388 Transport packaging - Marking for receipt and delivery
GB/T 6461 Methods for corrosion testing of metallic and other inorganic
coatings on metallic substrates - Rating of test specimens and manufactured
articles subjected to corrosion tests
GB/T 6739 Paints and varnishes - Determination of film hardness by pencil
test
GB/T 9286 Paints and varnishes - Cross cut test for films
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Chipped areas
More than two surface damages >= 0.4 mm.
3.2
Blister or void
The portion of surface break when using a 13 mm diameter nylon rod to
manually apply pressure to 44.5 N.
3.3
Surface porosity
The holes on the surface which do not penetrate the base material.
3.4
Molding irregularity
Any visible defects associated with molding, such as corrugations, dome,
missing material, flash or dents. Weld marks and sprues are not considered
to be molding irregularity.
3.5
Pit
A small pit of approximately equal width and depth on the surface.
3.6
Pinhole
A small hole on the surface that does not exceed 0.4 mm in diameter.
3.7
Speck
The different color at surface which is generated by the foreign particles, the
maximum size of the speck is 0.7 mm. It does not include specks or mixed
specks that produce a decorative pattern on the surface.
4 Classification
4.1 In accordance with the material, it is divided into plastic, wood, composite
and resin products.
5 Requirements
5.1 Size
5.1.1 The allowable deviation of the dimensions as shown in Figure 1 is <= ± 3
mm;
5.1.2 Bumper height >= 1.6 mm.
5.2 Surface quality
The product surface is divided as follows.
5.2.2 The surface quality of the wood seat and cover shall comply with the
requirements of Table 2.
5.2.3 The surface quality of the composite seat and cover shall comply with the
requirements of Table 3.
5.5.4 Coating hardness
The coated seat and cover have a coating hardness of not less than 2 B.
5.5.5 Coating adhesion
The coated seat and cover have a coating adhesion of not more than grade 2.
5.5.6 Color fastness
Colored seats and covers shall be free of stains.
5.5.7 Moisture-resistance
Except for the thermoplastic seat and cover, the other seat and cover shall, after
the test, comply with the requirements of 5.1.1, the surface quality shall comply
with the requirements of 5.2.
5.5.8 Cold-hot fatigue
After the test, it shall comply with the requirements of 5.1.1 and 5.3.2.
6 Test methods
The following tests of 6.1 and 6.4 ~ 6.13 shall be carried out at an ambient
temperature of 22 °C ± 3 °C.
6.1 Measurement method of dimension
The dimensions are measured by a ruler which has a division value of 1 mm
and an I-square which has a division value of 1°.
6.2 Inspection of surface quality
First use standard detergent and water to wash the seat and cover, let it dry
naturally or otherwise use a clean, absorbent, lint-free material to wipe it dry.
Use a sponge which has dipped the 50% aqueous solution of ink to wipe its
surface, then use tap water to rinse the mark of ink and let it dry naturally.
6.3 Lean-back test
Install the seat and cover on the test platform in the use state, turn the seat and
cover to fully open it, measure the angle with the horizontal plane and record it
(see Figure 3).
6.4 Measurement of warpage
Install the seat and cover on the test platform in the use state. The contact
surface between the test platform and the seat are the same as in the use state.
Lower down the seat and cover, use a feeler gauge which has a division value
of 0.1 mm or an equivalent measuring instrument, to respectively measure the
maximum clearance between the cover's bumper and the seat as well as the
maximum clearance between the seat's bumper and the test platform.
6.7 Swing test
Make inspection in accordance with the provisions of Appendix A.
6.8 Test of bolt and nut's torque
Use metal nuts, bolts, etc. to fix the test bolts and nuts in the holes of the test
torque bench, use the torque wrench to determine the torque. The bolt torque
test is as shown in Figure 5, the nut torque test is as shown in Figure 6.
6.9 Impact test
Let a steel ball which has a diameter of 38 mm and a mass of 0.225 kg freely
fall from a height of 455 mm, onto the center of the cover, the front center of the
seat, and the center of the middle of seat, respectively. The impact position is
as shown in Figure 7.After the impact is completed, check it in accordance with
6.2.
7 Inspection rules
7.1 Inspection classification
Product inspection includes exit-factory inspection and type inspection.
7.2 Exit-factory inspection
Exit-factory inspection items include size, surface quality, processing and
assembly.
7.3 Type inspection
Type inspection includes all items required by this standard. Under normal
circumstances, type inspection is carried out at least once a year.
Type inspection shall also be carried out in one of the following cases.
7.3.1 Batch-group rule and sampling plan
Every 200 sets ~ 1000 sets of products of the same type and the same grade
form a batch, those less than 200 sets are also considered as a batch. The
sampling plan is carried out in accordance with the provisions of GB/T 2829,
use the decision level I and the once sampling plan.
8 Marking, product's operation instruction
8.1 Each product shall have an obvious registered trademark with a certificate
of conformity and operation instructions for installation and use.
8.2 The single package of product shall be marked with the name of
manufacturer, the address of manufacturer, the product name, the date of
manufacture, the registered trademark.
9 Packaging, transportation and storage
9.1 Each set of products shall be packaged separately, to ensure no collision
between products. The package dimensions and markings are carried out in
accordance with the provisions of GB/T 4892 and GB/T 6388.
......
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 23 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 2829Sampling procedures and tables for periodic inspection by attributes
- GB/T 4892Dimensions of rigid rectangular transport packages
- GB/T 6388Transport package shipping mark
- GB/T 6461Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates -- Rating of test specimens and manufactured articles subjected to corrosion tests
- GB/T 6739Paints and varnishes - Determination of film hardness by pencil test
- GB/T 9286Paints and varnishes - Cross-cut test
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