gel-coated glass fibre-reinforced polyester resin bathtubs

IS 6411: Scope & Key Specifications for Bath Tubs

Scope (Clause 2.0)

• Defines terms and applicability related to bath tubs.
• Ensures standardization in dimensions and construction.

Key Dimensions (Clause 5.1 & Table 3)

Notes

• Waste hole designed to suit +40 mm waste fitting.
• Overflow designed for +40 mm overflow fitting.
• Dimensions may vary if agreed upon by manufacturer and purchaser.

Rounding Off (Clause 0.4)

• Final test or analysis values rounded per IS 2:1960, maintaining significant digits as per the standard.

flowchart LR
    A[Length Overall (A)] -->|1680-1700 mm| BathTub
    B[Width Overall (B)] -->|730-760 mm| BathTub
    C[Height Overall (C)] -->|500-570 mm| BathTub
    D[Depth Inside (D)] -->|440 mm| BathTub
    E[Roll Head & Sides (E)] -->|60-85 mm| BathTub
    F[Roll Tap End (F)] -->|75-100 mm| BathTub
    G[Waste Hole Distance (G)] -->|250 mm| BathTub
    H[Overflow Distance (H)] -->|100 mm| BathTub

This summary ensures compliance with IS 6411 dimensional requirements for bath tubs.

IS 6411: Key Definitions, Dimensions & Specifications

1. Definitions (Clause 2.0)

• Standard terms related to bath tubs as per IS 6411 apply for clarity and uniformity in manufacturing and testing.

2. Dimensions of Bath Tubs (Clause 5.1, Table 3)

• Waste hole to suit +40 mm waste fitting.
• Overflow to suit +40 mm fitting.

3. Construction Thickness (Clause 6.8, Table 6)

4. Permissible Defects (Clause 4.4, Table 2)

IS 6411: Key Material Specifications & Tables

1. Thickness Requirements (Clause 6.8)

2. Material Components (Clause 2.6)

• Filler: Used besides glass fibre, resin, and pigment in bath tub manufacture.

3. Workmanship & Defects

Non-Permissible Defects (Clause 4.3, Table 1)

• Upper rim, inner wall, bottom, apron, visible faces:
  Small pores, wrinkles, crazes, bubbles, defective impregnation, superficial injuries, aggregate defects are not allowed.

• Obscure faces:
  Defective impregnation and superficial defects are not allowed.

Permissible Defects (Clause 4.4, Table 2)

Summary

• Minimum laminate thickness ensures structural integrity.
• Strict control on defects maintains quality and durability.
• Use Table 1 and Table 2 to assess acceptability of surface defects.

flowchart TD
    A[Material Components] --> B[Glass Fibre]
    A --> C[Resin & Pigment]
    A --> D[Filler]

IS 6411: Workmanship and Finish — Key Points

1. Non-Permissible Defects (Clause 4.3, Table 1)

2. Permissible Defects (Clause 4.4, Table 2)

3. Gel-Coat Specification (Clause 3.4)

• Uniform gel-coat on working surface.
• Resin type: Isophthalic polyester, epoxy, or chemically resistant equivalent.

4. Thickness Requirements (Clause 6.8)

This ensures durability, chemical resistance, and aesthetic quality in glass fibre reinforced polyester baths.

IS 6411: Key Dimensions of Bath Tubs (Clause 5.1, Table 3, Fig. 1)

• Waste hole to suit +40 mm waste fitting
• Overflow fitting +40 mm

Thickness Specifications (Clause 6.8, Table 6)

Notes:

• Dimensions are in millimeters.
• Manufacturer and purchaser may agree on other dimensions.
• Ensure compliance with workmanship and defect limits (Clause 4.4, Table 2).

graph TD
  A[Length overall at top (A): 1680-1700 mm] --> B[Width overall at top (B): 730-760 mm]
  B --> C[Height overall (C): 500-570 mm]
  C --> D[Depth inside at waste (D): 440 mm]
  D --> E[Roll at head/sides (E): 60-85 mm]
  E --> F[Roll at tap end (F): 75-100 mm]
  F --> G[Tap holes distance: 180 mm]
  G --> H[Waste hole distance (G): 250 mm]
  H --> I[Overflow distance (H): 100 mm]

This summary provides essential dimensional and construction specifications for bath tubs per IS

IS 6411: Key Construction Specifications for Bath Tubs

1. Thickness of Glass Fibre Reinforced Polyester Laminate (Clause 6.8)

2. Dimensions of Bath Tubs (Clause 5.1, Table 3 & Fig. 1)

3. Workmanship & Defects

• Non-permissible defects (Table 1):

  • Small pores, wrinkles, crazes, bubbles, defective impregnation on visible and obscure faces are not allowed.

• Permissible defects (Table 2):

  • Minor traces of mending, impurities, pinholes allowed within limits (2-3 counts depending on part).
  • Colour bolts and unevenness should not be conspicuous.
  • Deformities in the bend should be less than 5 mm.

Summary

• Maintain minimum laminate thickness as per part.
• Adhere to dimensional tolerances for proper fit and function.
• Ensure strict quality control to avoid non-permissible defects.
• Minor defects allowed only within specified limits.

flowchart TD
    A[Glass Fibre Reinforced Polyester Laminate]
    A --> B[Thickness: Apron 2mm]
    A --> C[Thickness: Inner wall & bottom 3mm]
    A --> D[

IS 6411: Performance Requirements Summary

Thickness Requirements (Clause 6.8)

Performance Criteria (Clause 8.11.2)

• No surface cracks after testing and ink inspection.
• Maximum deflection under load: ≤ 4 mm.
• Residual deflection (10 min after load removal): ≤ 0.2 mm.

Rounding Off Values (Clause 0.4)

• Final test/analysis values must be rounded per IS 2:1960.
• Maintain the same number of significant digits as the specified value.

Key Notes:

• Deflection limits ensure structural integrity and durability.
• Thickness specs ensure adequate strength and resistance to wear.
• Inspection after ink testing detects micro-cracks.

flowchart LR
    A[Test Load Applied] --> B{Deflection ≤ 4 mm?}
    B -- Yes --> C[Inspect Surface for Cracks]
    C -- No Cracks --> D[Load Removed]
    D --> E{Residual Deflection ≤ 0.2 mm?}
    E -- Yes --> F[Pass Performance Test]
    B -- No --> G[Fail]
    C -- Cracks Found --> G
    E -- No --> G

This ensures compliance with IS 6411 performance standards for glass fibre reinforced polyester laminates.

IS 6411: Key Testing Methods Summary

1. Load Deflection Test (Clause 8.11.1)

• Preload: 135 kg on 75 mm diameter disk, cushioned by 150 mm sponge rubber.
• Procedure:
  • Apply preload for 2-3 min.
  • Remove load; wait 10-15 min.
  • Reapply 135 kg load rigidly for 1-2 min.
  • Measure deflection with accuracy ±0.02 mm.
  • Measure residual deflection within 10 min after unloading.
• Additional Checks: Apply 135 kg load at two other bottom points and two rim points to check for cracks.

2. Tensile Strength Test (Clause 8.13)

• Specimen: Dumb-bell shaped with two 10 mm bolt holes (see Fig. 2).
• Thickness: Measured to ±0.025 mm.
• Test Speed: Traverse rate 5.0 to 6.5 mm/min.
• Calculation:

[ \text{Tensile Strength} = \frac{\text{Breaking Load (N)}}{\text{Cross-sectional Area (mm}^2)} ]

• Take mean of 3 valid tests; discard if break occurs in grip.

3. Impact Test (Clause 8.3)

• Specimen: Clamped in 125 mm diameter frame.
• Impact: 225 g steel ball (38 mm dia) dropped from:
  • 150 mm height on reverse side.
  • 750 mm height on gel-coated side.
• Evaluation: Use ink test to detect cracks post-impact.

4. Rounding Off (Clause 0.4)

• Final test values rounded per IS:2-1960, matching decimal places of specified values.

flowchart LR
    A[Apply 135 kg preload] --> B[Wait 2-3 min]
    B --> C[Remove load, wait 10-15 min]
    C --> D[Reapply 135 kg load rigidly]
    D --> E[Measure deflection]
    E --> F[Measure residual deflection]
    F --> G[Check for cracks at additional points]

This concise overview covers critical test procedures and calculations per IS

IS 6411 - Marking and Labeling for Bath Tubs

• Clause 9.1:
  Each bath tub must be clearly marked by stamping and labeling in a prominent place with:

  • Manufacturer's name
  • Manufacturer's trade-mark

• Purpose:
  Ensures traceability and authenticity of the product.

• Additional Notes:

  • Marking should be durable and legible throughout the product life.
  • No specific formula or table is provided for marking dimensions or style in IS 6411.

Thickness Table (For reference, Clause 6.8):

Summary Diagram: Marking Location on Bath Tub

flowchart LR
    A[Bath Tub] --> B[Prominent Location]
    B --> C[Stamped Manufacturer Name]
    B --> D[Stamped Trade-mark]

Key takeaway: Marking is mandatory, visible, and permanent for manufacturer identification.

IS 6411 - Manufacturer's Instructions for Bath Tubs (Clause 10.1)

• Requirement: Manufacturer must provide clear instructions for cleaning and maintenance with each bath tub.
• Purpose: Ensures longevity, hygiene, and performance of bath tubs.
• No specific formulas or tables are prescribed for instructions, but they should cover:
  • Suitable cleaning agents (non-abrasive, non-corrosive)
  • Recommended cleaning frequency
  • Maintenance tips to avoid damage to gel-coat and laminate
  • Handling and installation guidelines

Related Key Specifications from IS 6411:

Illustration of Dimensions (Fig. 1):

graph LR
A[Length overall at top (1680-1700 mm)]
B[Width overall at top (730-760 mm)]
C[Height overall (500-570 mm)]
D[Depth inside at waste (440 mm)]
E[Roll at head end and sides (60-85 mm)]
F[Roll at tap end (75-100 mm)]
G[Waste hole distance from edge (250 mm)]
H[Overflow vertical distance below top edge (100 mm)]

Summary:
IS 6411 mandates manufacturers to provide cleaning and maintenance instructions but does not specify exact content or format. Refer to bath tub construction and dimension clauses for technical details to support maintenance guidelines.