vitreous sanitary appliances (vitreous china): Part 1 General requirements

IS 2556 Part 1: Scope & Key Specifications Summary

This part covers general requirements for vitreous china sanitary appliances including:

• Terminology, material, manufacture, glazing, defects, minimum thickness, tolerances, performance, and test methods.
• Applies to appliances covered in other parts of IS 2556.

Key Specifications:

Important Formula (Clause 10.4.3):

For circular cross-section:

[ S = 8 P L R D ]

Where:

• (S) = (specific parameter, e.g. strength or stress)
• (P, L, R, D) = parameters defined in the standard (refer to Clause 10.4.3 for detailed definitions)

Chemical Solutions for Testing (Table 4):

*Detergent: aqueous solution with 0.04% condensation product of nonyl-phenol + ethylene

IS 2556 Part 1: Terminology & Key Specifications

Terminology (Clause 3.0):

• Definitions follow IS 2781:1975 for ceramic wares.
• Where conflicts arise, definitions in IS 2556 prevail.
• Covers terms related to vitreous sanitary appliances (vitreous china).

Key Formula (Clause 10.4.3):

For circular cross-section:

[ S = \frac{8PL}{\pi D^3} ]

• S = Section modulus
• P = Load
• L = Length or span
• D = Diameter of circular cross-section

(Note: The formula in your context is abbreviated; the standard formula for circular cross-section bending is shown above for clarity.)

Chemical Resistance Testing (Annex B, Table 4):

Note 1: Detergent is a nonyl-phenol ethoxylate (8-10 EO molecules).

Summary:

• IS 2556 Part 1 standardizes terminology referencing IS 2781.
• Provides formulae for structural calculations (e.g., bending in circular sections).
• Specifies chemical resistance test solutions and conditions for vitreous china.

flowchart TD
    A[Terminology per IS 2781] --> B[Definitions in IS 2556 prevail]
    B --> C[Material & Manufacture Specs]
    C --> D[Chemical Resistance Testing]

IS 2556 Part 1: Definitions of Defects & Surface Characteristics

Key Specifications & Tolerances

• Minimum Thickness: 6 mm at any point.
• Dimensional Tolerances:
  • ≥ 75 mm: ±2% or ±2 mm (whichever is more)
  • < 75 mm: ±5% or ±2 mm (whichever is more)
  • Flush outlet height: ±5 mm
  • Angles: ±3°

Illumination for Visual Examination

• Illumination: ≥ 300 lx (lux) with 6500 K fluorescent lamps, positioned ≥ 2 m above appliance.

Table 1: WC Pans, Bidets, Squatting Pans, Urinals, Accessories

Table 2: Wash Basins, Laboratory Sinks, Drinking Fountains

IS 2556 Part 1: Material and Manufacture - Key Specifications

1. Material Requirements

• Vitreous china sanitary appliances must meet chemical resistance as per Table 4 (Annex B):

*Detergent: 0.04% condensation product of nonyl-phenol with 8-10 ethylene oxide molecules.
**Hydrochloric acid: Equal volumes of water and acid (specific gravity 1.18).

2. Manufacture and Finish Tolerances

• Minimum thickness: 6 mm at any point.
• Dimensional tolerances:
  • ≥ 75 mm: ±2% or ±2 mm (whichever is more)
  • < 75 mm: ±5% or ±2 mm (whichever is more)
  • Flush outlet height: ±5 mm
  • Angles: ±3°

3. Permitted Defects (Examples)

• Warpage:
  • Flushing cistern flat back: ≤ 5 mm
  • Coupled cistern bottom: ≤ 3 mm
  • WC pans: ≤ 6 mm (long pattern), ≤ 10 mm (Orissa pattern)
• Surface blemishes:
  • Spots, blisters, pinholes: limited numbers depending on location (e.g., ≤4 on flushing cisterns)
  • Polishing marks: limited, none on coloured appliances
• Discoloration: None on visible surfaces.

Summary Diagram: Defect Limits on Visible Surfaces

graph TD
   

IS 2556 Part 1: Application of Glazing – Key Specifications and Tables

1. Glazing Requirements (Clause 5.1)

• Vitreous glazing must be thoroughly fused to the body.
• All exposed surfaces: uniformly glazed, impervious, high gloss, free from craze and discoloration.
• Thickness and opacity must ensure uniform color and finish.

2. Permissible Defects & Blemishes (Clause 6.1 - 6.3)

3. Minimum Thickness (Clause 7)

• Thickness at any point ≥ 6 mm.

4. Dimensional Tolerances (Clause 8)

• Dimensions ≥ 75 mm: ±2% or ±2 mm (whichever is more)
• Dimensions < 75 mm: ±5% or ±2 mm (whichever is more)
• Flush outlet height: ±5 mm
• Angles: ±3°

5. **

IS 2556 Part 1: Permissible Blemishes or Defects Summary

Key Tables for Permissible Defects

Additional Specifications

• Minimum thickness: ≥ 6 mm everywhere.
• Discoloration & Wavy finish: None allowed on visible surfaces.
• Inspection lighting: 300 lx minimum; fluorescent lamps at 6500 K, 2 m above appliance.
• Tolerance on dimensions:
  • ≥ 75 mm: ±2% or ±2 mm (whichever greater)
  • < 75 mm: ±5% or ±2 mm
  • Flush outlet height: ±5 mm
  • Angles: ±3°

Notes

• Minor

IS 2556 Part 1: Minimum Thickness & Related Specifications

1. Minimum Thickness (Clause 7)

• The thickness of any part of a vitreous sanitary appliance shall not be less than 6 mm.

2. Dimensional Tolerances (Clause 7)

3. Warpage Limits (Clause 6 & 9)

• Warpage checks: Using feeler gauge equal to max warpage in Tables 1, 2, 3.
• Permitted warpage examples:
  • WC pans & bidets: max 6 mm
  • Squatting pans (long pattern): max 10 mm
  • Flush cistern flat back: max 5 mm
  • Coupled cistern bottom: max 3 mm

4. Blemishes & Defects (Tables 1, 2, 3)

• Visible surfaces: No wavy finish or discoloration
• Spots, blisters, pinholes: limited numbers (e.g., max 3 on flushing surfaces)
• Polishing marks: limited or none on colored appliances

Summary Table: Minimum Thickness & Tolerances

This ensures structural integrity and aesthetic quality of vitreous china sanitary appliances per IS 2556 Part 1.

IS 2556 Part 1: Tolerances Summary

1. Dimensional Tolerances (Clause 7)

• Dimensions ≥ 75 mm: ± 2% or ± 2 mm (whichever is more)
• Dimensions < 75 mm: ± 5% or ± 2 mm (whichever is more)
• Height of flush outlet (P-traps/horizontal outlets): ± 5 mm
• Angles: ± 3°

2. Warpage Limits (Clause 9.1 & Tables 1, 2, 3)

• Warpage checked using a feeler gauge equal to max permitted warpage; gauge should not slide without force.
• WC pans & bidets: max 6 mm (long patterns up to 10 mm)
• Squatting pans: max 6 mm (long patterns up to 10 mm)
• Wash basins: max 6 mm out of horizontal plane; backs attached to wall max 3 mm
• Flushing cisterns: flat back max 5 mm; bottom portion max 3 mm

3. Surface Defects Permitted

4. Minimum Thickness

• Minimum thickness of any part of appliance: 6 mm

Example: Warpage Check Procedure (Clause 9.1)

flowchart TD
    A[Place appliance on flat surface] --> B[Insert feeler gauge of max warpage thickness]
    B --> C{Gauge slides without force?}
    C -- Yes --> D[Appliance exceeds warpage tolerance - Reject]
    C -- No --> E[Within tolerance - Accept]

Note: Minor imperfections not affecting appearance or function are acceptable per IS 2556.

IS 2556 Part 1 — Performance Requirements Summary

1. Visual Examination & Defects (Clause 6.3 & Table 3)

• Warpage:
  • Flat back portion ≤ 5 mm
  • Bottom portion (coupled cistern) ≤ 3 mm
  • None on visible surfaces.
• Discoloration & Wavy finish:
  • Max 2500 mm² on ends, none on cover.
• Spots, blisters, pinholes:
  • Max 4 total on grouping; max 1 on covers.
  • For colored appliances, max 1 blister and 1 pinhole each, none on covers.
• Bubbles & specks:
  • Max 2 per pottery square; total max 6 including max 2 on cover.
• Polishing marks:
  • Only 1 allowed; none on cover or colored appliances.

2. Illumination for Visual Inspection (Clause 6.4)

• Minimum illumination: 300 lx (lux) using a light meter.
• Artificial light: Fluorescent lamps, 6500 K color temperature, minimum 2 m above appliance.

3. Minimum Thickness (Clause 7)

• Thickness ≥ 6 mm everywhere.

4. Dimensional Tolerances (Clause 7)

5. Chemical Resistance Test (Clause 10.3.2 & Table 4)

IS 2556 Part 1: Methods of Test - Key Formulas, Tables & Specs

1. Test Procedure (Clause 10.3.2)

• Specifies standardized procedures for testing vitreous china sanitary appliances.
• Tests include mechanical strength, chemical resistance, glaze quality, and dimensional tolerances.

2. Formula for Circular Cross Section (Clause 10.4.3)

• For strength or load-related tests on circular sections, use:

[ S = \frac{8PL}{\pi D^3} ]

Where:

• S = Stress (N/mm²)
• P = Load applied (N)
• L = Length or span (mm)
• D = Diameter of circular cross section (mm)

Note: This formula was substituted in Amendments No. 1 and 3.

3. Chemical Resistance Test (Annex B, Clause 9.5)

• Control test piece size is standardized to ensure consistency.
• Chemical agents updated (e.g., Methylene Chloride, Perchloroethylene replacing Carbon Tetrachloride).
• Table 4 in Annex B notes inclusion of "Alcohol ethoxylates or" in chemical products tested.

4. Rounding Off (IS 2:1960)

• Final test results should be rounded off to the same number of significant digits as specified values.

Summary Table: Key Test Aspects

flowchart TD
    A[Test Setup] --> B[Apply Load P]
    B --> C[Measure Dimensions D, L]
    C --> D[Calculate Stress S = 8PL / (πD³)]
    D --> E[Compare with Specified Limits]
    E --> F{Pass/Fail}

This concise overview covers the essential formulas, tables, and specifications for methods of test in IS 2556 Part 1. For detailed test steps,

IS 2556 Part 1 — Lead Solubility Test (Annex A, Clause 5.2)

Key Specifications:

• Sample Preparation:
  Dry glaze sample at 100°C.

• Test Procedure:
  Shake 1 part sample with 1000 parts dilute HCl (50% dilution, sp. gravity 1.18) for 1 hour at room temperature.
  Let stand 1 hour, then filter.

• Lead Precipitation:
  Lead in filtrate precipitated as lead sulfate.
  Weight of lead sulfate (calculated as PbO) must not exceed 5% of dry sample weight.

Chemical Solution for Lead Solubility Test:

Additional Chemicals (Clause 2.1 - Table B-2):

*Detergent: aqueous solution with 0.04% condensation product of nonyl-phenol with 8-10 EO molecules.

Summary Formula:

[ \text{Lead content as PbO} = \frac{\text{Weight of PbSO}4 \times M{\text{PbO}}}{M_{\text{PbSO}_4}} ]

Where:

• ( M_{\text{PbO}} = 223.2 \

IS 2556 Part 1: Tests for Chemical Resistance (Clause 9.5, Annex B)

Key Specifications & Tables

*Detergent: aqueous solution with 0.04% wt/vol of nonyl-phenol ethoxylate (8-10 EO molecules).
**Hydrochloric acid: equal volumes water + HCl (SG 1.18).

Test Procedure Summary

• Test pieces of ≥10 mm diameter are exposed to chemicals.
• Chemicals are applied on glazed surface, dried, then residues removed with distilled water-moistened cloth.
• Visual inspection by trained observer: No loss of glaze reflectivity allowed.
• Additional staining/burning tests (Annex C) require no residual stains.

Additional Chemicals for Staining Tests (Clause 10, Annex C)

• 0.5% methylene blue aqueous solution
• Sodium hypochlorite (10-14% chlorine, diluted 10%)
• 3% hydrogen peroxide aqueous solution
• Amyl acetate
• Carbon tetrachloride
• Iodine (13 g/L in ethanol)

flowchart TD
    A[Test Piece Preparation] --> B[Apply Chemical Solutions]
    B --> C[Dry & Remove Residue]
    C --> D[Visual Inspection for Reflectivity Loss]
    D -->|No Loss| E[Pass Chemical Resistance Test]
    D -->|Loss Observed| F[Fail Test]

**Summary

IS 2556 Part 1: Tests for Resistance to Staining and Burning (Clause 9.6, Annex C)

Test Piece Size (C-1)

• Test pieces should be of standard size (typically as per Clause 2.2, usually around 10 mm diameter spots** applied on glazed surface**).

Chemicals for Staining Test (C-2.2)

Apply drops (~10 mm diameter) of each chemical on the glazed surface and allow to dry:

Test Procedure (Clause 10)

• After drying, residues are removed only with a cloth moistened with distilled water.
• No stain should remain visible to the unaided eye of a trained observer.

Key Points:

• No loss of glaze reflectivity (Annex B, Chemical Resistance).
• No staining or burning residue after test (Annex C).
• Visual inspection is the acceptance criterion.

flowchart TD
    A[Test Piece Preparation] --> B[Apply Chemical Drops (~10mm)]
    B --> C[Allow to Dry]
    C --> D[Remove Residue with Distilled Water Cloth]
    D --> E{Stain Present?}
    E -- No --> F[Pass Test]
    E -- Yes --> G[Fail Test]

This ensures the glaze's durability against common staining and burning agents as per IS 2556 Part 1.

Committee Composition - IS 2556 Part 1 (1994)

Sanitary Appliances and Water Fittings Sectional Committee, CED 3

• Chairman: Shri S. Prakash (Delhi Water Supply and Sewage Disposal Undertaking)
• Members: Representatives from various government bodies, research institutes, industries, and BIS including:
  • Central Public Health and Environmental Engineering
  • National Environmental Engineering Research Institute (CSIR)
  • Maharashtra Water Supply and Sewage Board
  • Central Glass and Ceramic Research Institute (CSIR)
  • Municipal Corporations (Bombay, Delhi)
  • National Test House, Kerala Water Authority
  • Hindustan Shipyard Ltd, Kirloskar Brothers Ltd, Hindustan Sanitaryware Industries Ltd
  • Central Public Works Department, Ministry of Railways, Directorate General of Supplies and Disposals
  • Central Building Research Institute, Building Material and Technology Promotion Council
  • Glass Fibre Technology Centre, Indian Water Works Association, Institution of Engineers (India)
• Ex-officio Member: Shri J. Venkataraman, Director General, BIS

Domestic Sanitary Appliances and Accessories Subcommittee, CED 3:1

• Convener: Shri R. K. Somany (Hindustan Sanitaryware and Industries Ltd)
• Members: Industry representatives, government engineers, research organizations, and BIS officials.

Notes:

• The committee includes technical experts from government, industry, research, and regulatory bodies ensuring comprehensive standard development.
• This composition supports the formulation, revision, and amendment of standards related to vitreous sanitary appliances.

If you need formulas or tables related to product specifications or tests, please specify.