JC/T 764-2008 English PDF (JC/T764-2008)

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JC/T 764-2008: WC seats
JC/T 764-2008
JC
BUILDING MATERIAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
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.
Please note that some of the contents of this standard may involve patents. The
issuing body of this standard shall not be responsible for identifying these
patents.
This standard was proposed by the China Building Materials Federation.
This standard shall be under the jurisdiction of the National Building Sanitary
WC seats
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.
3.8
Bumper
5.3 Processing and assembly
5.3.1 Lean-back
When the seat and cover are opened, the angle between the horizontal plane
is ≥ 95° and it can be kept in the open position.
5.3.2 Warpage
The warpage of the seat or cover with two bumpers is ≤ 3.2 mm. The of warpage
of the seat or cover with four bumpers is ≤ 4.8 mm.
5.3.3 Smoothness
The parting line and the edge of the seat and cover are smooth. There is no
hanging yarn from the combed cotton yarn which has a Tex count of 8 ~ 10
(English cotton yarn number 70 ~ 56).
5.4 Performance of use
5.4.1 Unrecoverable bending
The unrecoverable bending of the seat and cover is ≤ 1.3 mm. After the test,
there shall be no break, crack, or other damage.
5.4.2 Swing test
The load is 1335 N and the cycle is 25000 times. After the swing test, there
shall be no damage, the hinge is normal.
5.4.3 Bolt and nut torque
Metal bolts and nuts shall withstand a minimum torque of 3.4 N • m without
screw loose or break;
Plastic bolts and nuts shall withstand a minimum torque of 2.0 N • m without
screw loose or break.
5.4.4 Impact test
The surface of the plastic seat and cover after the impact test has neither crack
nor chipped area.
5.4.5 Open-close test (not applicable to soft close products)
After 50000 open-close tests, the bumper and the hinge are free from cracks,
damage or falling off. The seat and cover must not have cracks, breaks, or other
damages.
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°. After axially pushing the seat
and cover to move it along the opposite direction, use the feeler gauge which
has a division value of 0.1 mm to measure the axial clearance. Use the vernier
caliper which has a division value of 0.02 mm to respectively measure the
thickest part of each bumper, take the minimum value.
6.2 Inspection of surface quality
First use standard ...