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1、3ICS 91.140.70Q 31Record No.: 24229-2008 JC Standard of Building Material Industry of the Peoples Republic of China JC/T 764-2008 In place of JC/T 764-2001WC Seats and CoversGiven Free byIssue Department of Build Material Standard010-51164708Issued on June 16, 2008 Implemented on December 1, 2008Iss
2、ued by National Development and Reform Commission of the Peoples Republic of ChinaPrefaceThe amendment to this standard has adopted the American Standard Plastic WC Seats and Covers (ANSI Z 124.5-1997).This standard is a revision of the Plastic WC Seats and Covers (JC/T 764-2001).The main difference
3、s of this standard in comparison with ANSI Z 124.5-1997 are as follows:- Add special performance specifications and test methods on the WC seats and covers made of wood, composite material and resin;- Add definitions, technical requirements and test methods on slow fall down WC seats and covers;- Ad
4、d requirements on static load, moisture resistance, and cold-hot fatigue;- Employ the requirements for public use for unrecoverable bend amount.The main variations made in this standard in comparison with JC/T 764-2001 are as follows:- Add dimensional requirements and test methods;- Add technical re
5、quirements and test methods on soft close type WC seats and covers;- Add special performance specifications and test methods on the WC seats and covers made of wood, composite material and resin;- Eliminate the classifications of public use and domestic use for unrecoverable bend amount, but the tec
6、hnical requirements is the same as that for public use;- Add requirements on static load, moisture resistance, and cold-hot fatigue.The Appendix A and Appendix B in this standard are normative.This standard replaces JC/T 764-2001 from the date of implementation.Please note that certain content of th
7、is standard might be involved with patents, the recognition of which shall not be the responsibility of the agency issuing this standard.This standard is proposed by the China Building Materials Federation.This standard is under the jurisdiction of the National Technical Committee 249 on Building an
8、d Sanitary Ceramics of Standardization Administration of China.Units responsible for the drafting of this standard: Xianyang Research & Design Institute of Ceramics, Zhongshan Meitu Plastic IND Co., Ltd. and China Building Materials Federation.Units participating in the drafting of this standard: Ro
9、ca Sanitary Ware (Foshan) Co., Ltd., WDI (Xiamen) Technology Inc., Chaozhou Xindahua Plastic Industrial Co., Ltd., Xiamen R&T Plumbing Technology Co., Ltd., Tangshan Huida Ceramics (Group) Co., Ltd., Zhongshan Aimas Sanitary Ware Co., Ltd. and Oceanwell (Xiamen) Industrial Co. Ltd.This standard is m
10、ainly drafted by: Youhong LIU, Hong TIAN, Weiming WEN, Haojia HUANG, Xingyu LI, Wenmin GUAN, Bin WANG, Chun ZOU, Huiwen WANG, Yujia ZHOU and Dong PENG.All previous versions of the standard replaced by this standard are as follows:- GB 8285-1987, JC/T 764-2001.WC Seats and Covers1 ScopeThis standard
11、stipulates the terms, definitions, classifications, requirements, test methods, inspection rules, marks, instruction manual, packing, transport and storage of WC seats and covers.This standard applies to WC seats and covers which are made of plastics, wood, composite material or resin and installed
12、on the water closet for the purposes of comfort, sanitation and elegant appearance.2 Normative ReferencesThe following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For all the dated references, none of their subsequent modifica
13、tion lists (excluding the content corrected) or revisions applies to this standard. However, all parties who have reached an agreement as per this standard are encouraged to conduct relevant research to determine whether the latest versions of these documents are applicable. For all the undated refe
14、rences, their latest versions apply to this standard.GB/T 2829Sampling Procedures and Tables for Periodic Inspection by Attributes (apply to inspection of process stability)GB/T 4892Dimensions of Rigid Rectangular Packages Transport PackagesGB/T 6388Transport Package Shipping MarkGB/T 6461Methods fo
15、r Corrosion Testing of Metallic and Other Inorganic Coatings on Metallic Substrates Rating of Test Specimens and Manufactured Articles Subjected to Corrosion TestsGB/T 6739Paints and Varnishes Determination of Film Hardness by Pencil TestGB/T 9286Paints and Varnishes Cross Cut Test for FilmsGB/T 101
16、25Corrosion Tests in Artificial Atmospheres Salt Spray Tests3 Terms and DefinitionsThe following terms and definitions apply to this standard.3.1 Chipped areasMore than two surface damages0.4mm.3.2 Blister or voidThe sections where cracks occur on the surface when the pressure is manually increased
17、to 44.5N with a nylon rod (13mm in diameter).3.3 Surface porosityOn the surface, there is no void that has penetrated the base material.3.4 Molding irregularityAny visible molding-related defects, such as corrugation, dome surface, incomplete filling, flash or pit. Weld mark and sprue are not regard
18、ed as molding irregularities.3.5 PitSmall holes on the surface with approximately equal width and depth.3.6 PinholeSmall holes on the surface with the diameter of no more than 0.4mm.3.7 SpeckSurface discolorations generated by contamination particles with a maximum size of 0.7mm, excluding the spots
19、 and mixed spots which generate decorative patterns on the surface.3.8 BumperSeparately connected or integrally formed moldings in the WC seat or WC cover, playing the role of support and cushioning.3.9 EdgeContour lines on the lower surface of the WC seat or WC cover.3.10 Parting lineVisible lines
20、formed by separated molds in injection molding or compression molding process.3.11 Soft closeThe WC seat and cover start to close automatically at an opening angle of 70 degrees, taking no less than 3s.3.12 Glaze spillsSurplus coating that dropped down during production.3.13 SplintersSplit pieces on
21、 unsmooth, ruptured surface.3.14 Grain below lacquerAny grains that are covered by the lacquer and could not be scraped off by hard objects.3.15 Grain above lacquerAny grains that might be scraped off by hard objects and generate splinters.3.16 StainColor imbalance on the surface.4 Classifications4.
22、1 Based on the materials of which they are made, they are divided into plastic, wood, composite material and resin products.4.2 Based on the ways by which they are closed, they are divided into general type and soft close type.5 Requirements5.1 Dimension5.1.1 The allowable deviation for the dimensio
23、ns showed in Figure 1 3mm;Axial clearance 3mm;The dimensions and specifications of the special WC seats and covers in match with the water closet are provided as required by the contract.5.1.2 Height of cushion 1.6mm;5.2 Surface qualitySurface of the product is divided as follows: Figure 1 Dimension
24、sSurface A: upper and lower surfaces of the WC cover and upper surface of the WC seat;Surface B: lower surface of the WC seat;Surface C: the invisible surface after installation of the WC seat and cover.See schematic diagram of the division of surface in Figure 2.Lower SurfaceCushionRear EdgeHingeUp
25、per surface Upper surfaceLower Surface Figure 2 Schematic Diagram of Surface Division5.2.1 The surface quality of plastic WC seats and covers must meet the requirements stipulated in Table 1.Table 1 Requirement on Surface Quality of Plastic WC Seats and CoversName of defectSurface ASurface BSurface
26、CFissureNot allowedNot allowedNot allowedChipped areasNot allowedNot allowedNot allowedBlister or voidNot allowedNot allowedNot allowedSurface porosityNot allowedNot allowedNot allowedMolding irregularity75mm, sum total in the circle 275mm, sum total in the circle 475mm, sum total in the circle 10Sp
27、eckDark spot 0.4mmLight spot 0.6mmInterval 75mmSum total at single surface 3Dark spot 0.5mmLight spot 0.7mmInterval 75mmSum total at single surface 6Dark spot 0.5mmLight spot 0.7mmInterval 75mmSum total at single surface 8Pit, pinholeNot allowedInterval 75mmSum total 2Interval 75mmSum total 4StainNo
28、t allowed75mm, sum total in the circle 375mm, sum total in the circle 55.2.2 The surface quality of wood WC seats and covers must meet the requirements stipulated in Table 2.Table 2 Requirement on Surface Quality of Wood WC Seats and CoversName of defectSurface ASurface BSurface CSurplus coatingNot
29、allowedAllowedAllowedSplinterNot allowedNot allowedNot allowedFissureNot allowedNot allowedNot allowedScratchNot allowedAllowedAllowedStainNot allowedAllowedAllowed5.2.3 The surface quality of composite material WC seats and covers must meet the requirements stipulated in Table 3.Table 3 Requirement
30、 on Surface Quality of Composite Material WC Seats and CoversName of defectSurface ASurface BSurface CSurplus coatingNot allowedNot allowedNot allowedSplinterNot allowedNot allowedNot allowedGrain below lacquerNot allowedNot allowedNot allowedGrain above lacquerNot allowedNot allowedNot allowedScrat
31、chNot allowedAllowedAllowedStainNot allowedAllowedAllowedCorrugationNot allowedAllowedAllowed5.2.4 The surface quality of resin WC seats and covers must meet the requirements stipulated in Table 4.Table 4 Requirement on Surface Quality of Resin WC Seats and CoversName of defectSurface ASurface BSurf
32、ace CBlisterNot allowedAllowed (2mm)AllowedWelding line0.5mm is not allowed; sum total of places 0.5mm no more than 2Allowed (not in flakiness)AllowedSplinterNot allowedNot allowedNot allowedFissureNot allowedNot allowedNot allowedIncomplete fillingNot allowedNot allowedNot allowedPin holeNot in fla
33、kiness; sum total of places in flakiness less than 2AllowedAllowedScratchNot allowedAllowedAllowedStainNot allowedAllowedAllowedCorrugationNot allowedAllowedAllowed5.3 Processing and assembling5.3.1 BackbendingThe inclined angle between the WC seat and cover and the horizontal plane after opening up
34、 should be 95 degrees, and the WC seat and cover should be maintained at the open position.5.3.2 WarpageThe warpage of the WC seat or WC cover with 2 cushions should be 3.2mm, while the warpage of the WC seat or WC cover with 4 cushions should be 4.8mm.5.3.3 SmoothnessThe parting lines and edges of
35、the WC seat and cover should be so smooth that, when testing with combed cotton yarn with a Tex number of 8-10 (English yarn counts between 70 and 56), no yarn is taken down.5.4 Character of service5.4.1 Unrecoverable bend amount The unrecoverable bend amount of the WC seat and cover should be 1.3mm
36、; no fracture, fissure or other damages should occur after test.5.4.2 Swing testAfter the swing test (load: 1335N; period: 25 000 times), no damage should occur, and the hinge should be in normal service.5.4.3 Torques of bolt and nutThe metal bolt and nut should be capable of bearing a minimum torqu
37、e of 3.4Nm without gear slip or fracture;The plastic bolt and nut should be capable of bearing a minimum torque of 2.0Nm without gear slip or fracture.5.4.4 Impact testNo surface fissure or chipped areas should be seen on the plastic bolt and nut after impact test.5.4.5 Switching test (not apply to
38、for soft close type products)After conducting the switching test for 50 000 times, no fissure, damage or fall-off should be seen on the cushion or hinge, and no fissure, fracture or other damages should be seen on the WC seat or WC cover.5.4.6 Soft close function life test (apply to soft close type
39、products)After the soft close function life test is carried out on soft close WC seat and cover for 30 000 times, the soft close device should work normally without damage and with soft close time of no less than 3s, and the requirements stipulated in Article 5.3.1 should be met as well.5.4.7 Forced
40、 test (apply to soft close type products)After forced switching test is carried out on soft close WC seat and cover for 10 000 times, the soft close device should work normally without damage and with soft close time of no less than 3s, and the requirements stipulated in Article 5.3.1 should be met
41、as well.5.4.8 Static loadNo fracture, fissure or severe deformation should occur after the test (load 1.5kN).5.5 Physical and chemical properties of materials5.5.1 Fire resistanceNo ignition or gradual heat emission should occur after fire resistance test.5.5.2 Stain resistanceNo impact should be im
42、posed on the surface by the reagent after the stain resistance test. In case of any possible impact, it is limited on the superficial surface, and could be restored to approximately the original state after polishing with a #600 abrasive paper.5.5.3 Corrosion resistance of metal auxiliariesAfter con
43、ducting the 24h acetic acid-salt spray on metal auxiliaries as per GB/T 10125, the requirements stipulated in Grade VIII of GB/T 6164 should be satisfied.5.5.4 Hardness of coatingThe hardness of coating on the WC seat and cover must be no less than 2B.5.5.5 Adhesion of coatingThe adhesion of coating
44、 on the WC seat and cover must be no more than Grade II.5.5.6 Color fastnessNo staining should be seen on the colored WC seat or cover.5.5.7 Moisture resistanceExcept thermoplastic plastic WC seat and cover, all other WC seats should satisfy the requirements stipulated in Article 5.1.1, and their su
45、rface quality should satisfy the requirements stipulated in Article 5.2.5.5.8 Cold-hot fatigueThe requirements stipulated in Article 5.1.1 and Article 5.3.2 should be satisfied after the test.6 Test MethodsThe tests described in Article 6.1 and 6.4-6.13 should be conducted under an environmental tem
46、perature of 223.6.1 Dimensional measurement methodThe overall dimensions are measured by a ruler with a scale of 1mm and a right angle ruler with a scale of one degree; push the WC seat and cover backward along axial direction, and measure the axial clearance through a feeler gauge with a scale of 0.1mm; measure the thickest place of each cushion through a slide caliper with a scale of 0.02mm, and the minimum value should be adopted.