Glazed Fire-clay Sanitary Appliances, Part V: Specific Requirements of Shower Trays

Scope Summary from IS 771 Part 5 (1979) - Shower Trays

• Scope: Specifies shape, size, and dimensional tolerances for glazed fire-clay shower trays.
• Dimensions: All dimensions in millimeters as per Fig. 1 (shape and size illustration).
• Tolerances:
  • For dimensions ≥ 50 mm: ±4%
  • For dimensions < 50 mm: ±2 mm
• Rounding off values: Final test or calculation results must be rounded as per IS 2-1960, retaining the same number of significant digits as specified.

Key Specifications

Rounding Rule (IS 2-1960)

• Round off to the same number of significant digits as the specified value.
• Ensures consistency in test and analysis reporting.

flowchart LR
    A[Dimension Measurement] --> B{Dimension ≥ 50 mm?}
    B -- Yes --> C[Tolerance ± 4%]
    B -- No --> D[Tolerance ± 2 mm]
    C & D --> E[Apply Rounding as per IS 2-1960]

This ensures compliance with dimensional accuracy and reporting standards for shower trays under IS 771 Part 5.

IS 771 Part 5 - Key Requirements Summary

• Rounding Off (Clause 0.3):
  Final test or analysis values must be rounded as per IS 2-1960.

  • Retain the same number of significant digits as the specified value in the standard.

• General Requirements (Clause 2.1):
  Material, manufacturing, testing, sampling, and inspection must comply with IS 771 Part I - 1979.

Important Notes:

Summary Diagram

flowchart TD
    A[Test/Analysis Result] --> B[Rounding per IS 2-1960]
    B --> C[Retain Significant Figures]
    C --> D[Compare with Specified Value]
    E[Material & Manufacture] --> F[Follow IS 771 Part I]
    F --> G[Testing, Sampling, Inspection]

This ensures consistent evaluation and compliance with IS 771 Part 5 requirements.

IS 771 Part 5 (1979) - General Key Points

• Material & Manufacture: Follow IS 771 Part 1 (1979) for material specs, manufacturing methods, testing, sampling, and inspection.

• Rounding Off Results:
  Use IS 2-1960 for rounding test results.

  • Retain same significant figures as the specified value.

• Dimensional Tolerances:

  Dimension Size	Tolerance
  ≥ 50 mm	± 4%
  < 50 mm	± 2 mm

These tolerances ensure manufacturing precision for components under IS 771 Part 5.

Summary Table

flowchart TD
    A[Material & Manufacture] --> B[IS 771 Part 1]
    B --> C[Testing & Sampling]
    C --> D[Rounding Off Results]
    D --> E[IS 2-1960 Rules]
    A --> F[Dimensional Tolerances]
    F --> G{Dimension Size}
    G -->|≥ 50 mm| H[±4%]
    G -->|< 50 mm| I[±2 mm]

This structure ensures compliance with IS 771 Part 5 general requirements.

IS 771 Part 5 (1979) – Shower Tray: Shape and Size

Key Specifications:

• Shape and Size: As per Fig. 1 (not provided here), all dimensions are in millimetres.
• Shower trays must strictly follow the shape and size illustrated in the standard figure.

Tolerances on Dimensions (Clause 2.4.1):

Rounding Off (Clause 0.3):

• Final values from tests or calculations must be rounded per IS 2-1960.
• Retain the same number of significant digits as specified in the standard.

Summary:

• Follow Fig. 1 for exact shape and size.
• Apply ±4% tolerance for dimensions ≥ 50 mm.
• Apply ±2 mm tolerance for dimensions < 50 mm.
• Use IS 2-1960 for rounding off results.

flowchart TD
    A[Start: Dimension Measurement]
    B{Dimension ≥ 50 mm?}
    C[Apply ±4% Tolerance]
    D[Apply ±2 mm Tolerance]
    E[Round off per IS 2-1960]
    F[Check Compliance with Fig. 1]
    G[Accept/Reject]

    A --> B
    B -- Yes --> C
    B -- No --> D
    C --> E
    D --> E
    E --> F
    F --> G

IS 771 Part 5: Marking Specifications Summary

Clause 3.1.1 - Marking Requirements:

• Each shower tray conforming to IS 771 Part 5 may be marked with the ISI Certification Mark.
• The ISI Mark assures compliance with the standard under ISI's inspection, testing, and quality control.
• Use of ISI Mark is governed by the Indian Standards Institution (Certification Marks) Act.
• Details on licensing for ISI Mark use can be obtained from ISI.

Rounding Off Results (Clause 0.3):

• Final test or analysis values must be rounded off per IS 2-1960.
• The number of significant digits in the rounded value should match the specified value in the standard.

Key Points:

Reference for Rounding Off (IS 2-1960):

This ensures consistent marking and quality assurance for shower trays under IS 771 Part 5.

ISI Certification Mark - IS 771 Part 5 (Clause 3.1.1)

• Applicability: Shower trays conforming to IS 771 Part 5 may be marked with the ISI Certification Mark.
• Purpose: The ISI Mark certifies compliance with Indian Standards under a strict system of inspection, testing, and quality control supervised by the Bureau of Indian Standards (BIS).
• Regulation: Use of the ISI Mark is governed by the Indian Standards Institution (Certification Marks) Act and related rules.
• Quality Assurance: ISI marked products undergo continuous conformity checks by BIS.
• Licensing: Manufacturers must obtain a license from BIS to use the ISI Mark.

Key Points on ISI Certification Mark:

BIS Headquarters Contact:

• Address: Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002
• Phone: 331 01 31, 331 13 75

Summary Diagram of ISI Mark Process

flowchart LR
    A[Manufacturer] --> B[Apply for ISI License]
    B --> C[BIS Inspection & Testing]
    C --> D{Complies with IS Standard?}
    D -->|Yes| E[License Granted & ISI Mark Allowed]
    D -->|No| F[Rectification Required]
    E --> G[Continuous BIS Surveillance]
    G --> H[Product Market]

Note: No specific formulas or tables are prescribed for the ISI Mark itself in IS 771 Part 5; it is a certification and marking system ensuring product conformity.

Sampling and Inspection as per IS 771 Part 5 (1979)

• General Requirement: Sampling and inspection conform to IS 771 Part 1 (1979).
• Rounding Off: Final test results must be rounded as per IS 2-1960, matching the significant figures of the specified values.
• Tolerances on Dimensions:
  • For dimensions ≥ 50 mm: ± 4%
  • For dimensions < 50 mm: ± 2 mm

Key Points on Sampling & Inspection

Notes:

• ISI mark indicates compliance with quality control and continuous inspection.
• Sampling plans and acceptance criteria are detailed in IS 771 Part 1.

flowchart TD
    A[Material Manufacture] --> B[Sampling as per IS 771 Part 1]
    B --> C[Testing & Measurement]
    C --> D{Are results within tolerance?}
    D -- Yes --> E[Accept Batch]
    D -- No --> F[Reject or Reprocess]
    E --> G[Mark with ISI Mark (optional)]

This ensures systematic quality assurance in production and inspection of materials covered under IS 771.

IS 771 Part 5: Methods of Test — Key Points

1. General Requirements (Clause 2.1):

• Tests must follow IS 771 Part I (1979) for material, manufacture, sampling, and inspection.
• Ensures uniformity and reliability of results.

2. Rounding Off Results (Clause 0.3):

• Final test values must be rounded per IS 2-1960.
• Retain the same number of significant digits as the specified standard value.

Typical Test Methods Covered (per IS 771 series general practice):

Important Notes:

• Sampling must be random and representative as per IS 771 Part I.
• Test results are pass/fail based on compliance with specified limits.
• Use standardized apparatus and conditions to ensure repeatability.

flowchart LR
    A[Material Sample] --> B[Sampling as per IS 771 Part I]
    B --> C[Mechanical Tests]
    B --> D[Chemical Analysis]
    B --> E[Dimensional Checks]
    C --> F{Pass/Fail}
    D --> F
    E --> F
    F --> G[Final Report with Rounded Values per IS 2-1960]

For detailed formulas or tables, refer to IS 771 Part I and related material-specific IS codes (e.g., IS 1608 for tensile tests).

IS 771 Part 5: Dimensions and Tolerances for Shower Trays

Key Specifications:

• Shape & Size: As per Fig. 1 (all dimensions in mm).
• Rounding Off: Follow IS 2-1960 for rounding test/analysis results to match specified significant figures.

Tolerances (Clause 2.4.1):

Notes:

• Dimensions must conform exactly to Fig. 1 layout.
• Use the above tolerances to verify compliance.
• Final reported values should be rounded consistent with the standard's precision.

Example Calculation:

For a dimension of 100 mm:

• Tolerance = ± 4% of 100 mm = ± 4 mm
• Acceptable range: 96 mm to 104 mm

For a dimension of 40 mm:

• Tolerance = ± 2 mm
• Acceptable range: 38 mm to 42 mm

flowchart LR
    A[Dimension] --> B{Is dimension ≥ 50 mm?}
    B -- Yes --> C[Tolerance = ± 4% of dimension]
    B -- No --> D[Tolerance = ± 2 mm]
    C --> E[Check if dimension within tolerance]
    D --> E

This ensures dimensional accuracy and quality control in shower tray manufacturing per IS 771 Part 5.

IS 771 Part 5 covers shower trays made of fire-clay, focusing on pattern, size, construction, dimensions, tolerances, and finish.

Surface Finish and Glazing (Key Points)

• Surface Finish: Must be smooth, uniform, and free from defects such as cracks, blisters, or rough spots to ensure hygiene and durability.
• Glazing:
  • Should be uniform and glossy over the entire surface.
  • Must provide imperviousness to water and stains.
  • Should resist abrasion and chemical attack from cleaning agents.
• Tolerances: Dimensions and finish tolerances are strictly controlled to maintain quality and fit.

Typical Specifications (From IS 771 & Fire-Clay Standards)

Notes:

• Glazing is applied before firing to bond permanently.
• Rounding off numerical values follows IS rounding rules (usually nearest 0.1 mm).

flowchart LR
    A[Raw Fire-Clay] --> B[Shaping Tray]
    B --> C[Drying]
    C --> D[Glazing Application]
    D --> E[Firing in Kiln]
    E --> F[Surface Finish Check]
    F --> G{Acceptable?}
    G -- Yes --> H[Packaging]
    G -- No --> I[Rework or Reject]

This ensures durable, hygienic, and aesthetically pleasing shower trays per IS 771 Part 5.

Quality Control as per IS 771 (Part 5) - 1979

Key Points:

• General QC Requirements: Refer to IS 771 (Part I) - 1979 for material, manufacturing, testing, sampling, and inspection procedures.
• Rounding Off: Final test results must be rounded as per IS 2-1960, retaining the same number of significant digits as specified.
• Marking & Certification: Products conforming to the standard may carry the ISI Certification Mark, indicating compliance under a supervised quality control system by BIS.
• Continuous Surveillance: ISI marked products undergo continuous checks for conformity, ensuring ongoing quality assurance.

Summary Table:

Notes:

• The standard emphasizes adherence to a well-defined QC system supervised by BIS.
• No explicit formulas or tables for QC are provided in Part 5; refer to Part I for detailed QC procedures.

flowchart TD
    A[Material & Manufacture] --> B[Testing & Sampling]
    B --> C[Inspection]
    C --> D[Compliance Check]
    D --> E{Conforms to IS 771?}
    E -->|Yes| F[ISI Certification Mark]
    E -->|No| G[Reject / Rework]
    F --> H[Continuous Surveillance by BIS]

For detailed QC methods, consult IS 771 (Part I).