jc t764 坐便器坐圈和盖en1023.doc

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, 2008Issued 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 differences 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;- Add 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 requirements 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 technical 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 this 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 and 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: Roca 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 mainly 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 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 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 modification 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 references, 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 for 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 10125Corrosion 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 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 regarded 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 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 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 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 Classifications4.1 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 dimensions 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 DimensionsSurface 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 EdgeHingeUpper 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 CFissureNot allowedNot allowedNot allowedChipped areasNot allowedNot allowedNot allowedBlister or voidNot allowedNot allowedNot allowedSurface porosityNot allowedNot allowedNot allowedMolding irregularityØ75mm, sum total in the circle 2Ø75mm, sum total in the circle 4Ø75mm, sum total in the circle 10SpeckDark 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 4StainNot allowedØ75mm, sum total in the circle 3Ø75mm, 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 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 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 allowedScratchNot 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 BSurface 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 flakiness; 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 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 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; 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 torque 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 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 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 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 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 imposed 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 conducting 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 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 surface 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 temperature of 22±3.6.1 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.