Specification -plastic window stays and fasteners

IS 6318: Scope - Key Specifications & Sampling

Scope:
IS 6318 covers specifications for window stays and fasteners, including sampling and quality criteria.

1. Sampling & Permissible Defects (Clause 1.2 & Table 2)

• Sampling ensures quality control by limiting defective stays/fasteners per lot size.

2. Mechanical Properties (Table 1, Sl No. iii & vii)

Summary

• Sampling size depends on lot size per Table 2.
• Defect limits ensure product reliability.
• Mechanical tests ensure durability under impact and load.

flowchart TD
    A[Lot Size] --> B{Sample Size}
    B --> C[Check Defects]
    C -->|Within limit| D[Accept Lot]
    C -->|Exceeds limit| E[Reject Lot]
    D --> F[Mechanical Tests]
    F --> G{Impact Strength ≥ 4.2 kgf/cm}
    F --> H{Deformation ≤ 4.5%}
    G & H --> I[Conformity Confirmed]

This summarizes the scope and key quality criteria per IS 6318.

IS 6318 - Materials for Polypropylene Window Stays

Key Material Specifications (Table 1)

Additional Notes:

• Impact strength and deformation limits ensure durability under mechanical and thermal stresses.
• Water absorption is kept minimal to prevent degradation.
• Weather resistance ensures long-term outdoor performance.

Sampling & Quality Control (Table 2)

Summary:

• Use polypropylene with specified density, strength, and thermal properties.
• Ensure impact strength ≥ 3.7 kgf/cm and deformation ≤ 6% at 50℃ under 70 kg/cm².
• Follow sampling plan for quality assurance.

flowchart LR
    A[Polypropylene Material] --> B{Check Properties}
    B -->|Density 0.900-0.910| C[Tensile Strength ≥315 kgf/cm²]
    B -->|Impact Strength ≥3.7| D[Water Absorption ≤0.04%]
    B -->|Deflection Temp ≥54℃| E[Deformation ≤6% at 50℃]
    C & D & E --> F[Conformity to IS 6318

IS 6318: Size and Shape of Window Stays and Fasteners

Key Points from Clause 3.1:

• Window stays and fasteners shall conform to sizes and shapes as per Fig. 1A and 1B (illustrative).
• They must be free from surface defects, indentations, and deformations.
• Sections may be reinforced with rust-proof steel wires if desired.
• Ends should be smooth to the touch for easy operation.
• Shapes and sizes can vary if mutually agreed between purchaser and manufacturer (Clause 3.1.1).

Material Specifications (Table 1):

Sampling & Quality Control (Table 2):

Summary:

• Follow Fig. 1A/1B for dimensions.
• Use polypropylene meeting Table 1 specs.
• Ensure smooth, defect-free finish.
• Sampling per Table 2 for quality assurance.

flowchart TD
    A[Window Stay Design] --> B[Conform to Fig. 1A/1B]
    B --> C[Size & Shape as per IS 6318]
    C --> D[Material: Polypropylene]
    D --> E[Me

IS 6318: Key Test Specifications and Sampling

1. Impact Strength (Table 1, Sl No. iii)

• Minimum Impact Strength: 4.2 kgf/cm (of notch)

2. Deformation Under Load (Table 1, Sl No. vii)

• Max Deformation: 4.5% at 50℃ under 70 kg/cm² load

3. Sampling Plan (Clause 1.2, Table 2)

• All samples must be inspected dimensionally and tested.
• Any failure in tests or dimensions = defective.

4. Tests for Window Stay and Fastener

• Alternating Force Test: 40 kgf applied alternatively on window stay and fastener (see Fig. 2 in IS 6318).
• Tests ensure durability under operational loads.

5. ISI Marking (Clause 6.1.1)

• Products conforming to these tests may carry the ISI Certification Mark, ensuring quality assurance.

flowchart LR
    A[Lot Size] --> B[Select Sample Size per Table 2]
    B --> C[Inspect Dimensions]
    C --> D[Test Impact Strength & Deformation]
    D --> E{Pass all tests?}
    E -->|Yes| F[Accept Lot]
    E -->|No| G[Reject Lot]

Summary: Use Table 2 for sampling; minimum impact strength 4.2 kgf/cm; max deformation 4.5% at 50℃/70 kg/cm²; alternate 40 kgf force test for durability.

IS 6318 - Marking Requirements for Window Stays and Fasteners

Key Specifications (Clause 6.1 & 6.1.1)

Each window stay and fastener shall be stamped with:

• Manufacturer's name and trade-mark
• Year of manufacture
• Country of origin

Additionally, the product may bear the ISI Certification Mark indicating compliance with ISI quality control and inspection (Clause 6.1.1).

Sampling & Defects (Clause 1.2, Table 2)

Mechanical Properties (Table 1 excerpts)

• Impact strength (notch), min: 4.2 kgf/cm
• Deformation under load (50°C, 70 kg/cm²), max: 4.5%

Summary Diagram of Marking & Sampling Process

flowchart TD
    A[Manufacture Window Stay/Fastener] --> B[Stamp Manufacturer Name, Year, Country]
    B --> C{Apply ISI Mark?}
    C -->|Yes| D[ISI Certification Mark]
    C -->|No| E[No ISI Mark]
    D & E --> F[Sampling as per Lot Size]
    F --> G[Check Permissible Defects]
    G -->|Within Limits| H[Accept Lot]
    G -->|Exceeds Limits| I[Reject Lot]

This ensures traceability, quality assurance, and conformity to IS 6318 standards.

IS 6318: Packaging & Material Specifications for Plastic Window Stays

1. Packaging Requirements (Clause 7.1)

• Each window stay & fastener must be wrapped in paper or polyethylene.
• Packed in a cardboard box.
• Box must be marked with:
  • Manufacturer's name & trademark
  • Quantity in package
  • Country of origin
  • Year of manufacture

2. Material Specifications for Polypropylene (Clause 2.1, Table 1)

3. Key Notes

• Impact strength and deformation limits vary slightly for specific members (see Table 1, Sl No. iii & vii).
• Packaging ensures product protection and traceability.

flowchart TD
    A[Window Stay & Fastener] --> B[Wrapped in Paper/Polyethylene]
    B --> C[Packed in Cardboard Box]
    C --> D[Box Marked with Info]
    D --> E{Info Includes}
    E --> F[Manufacturer Name & Trademark]
    E --> G[Quantity]
    E --> H[Country of Origin]
    E --> I[Year of Manufacture]

This summary covers packaging and polypropylene material specs per IS 6318. For detailed mechanical design, refer to tensile and impact strength values above.

IS 6318: Sampling and Criteria for Conformity (Clause 5.1 & Appendix A)

1. Sampling Method:

• Representative samples are drawn as per Appendix A.
• Sample size depends on lot size (Table 2).

2. Scale of Sampling (Table 2):

3. Criteria for Conformity:

• The lot is accepted if the number of defective stays/fasteners ≤ permissible number.
• Otherwise, the lot is rejected.

4. Additional Notes on Testing (Clause 4.2.2):

• For sliding windows, apply incremental load increases of 5 kgf every minute.
• Hold maximum load of 40 kgf for 1 minute if sash does not move.
• Test load = sliding load + force needed to cause unfastened window to slide.

flowchart TD
    A[Lot Size] --> B[Determine Sample Size from Table 2]
    B --> C[Inspect Sample]
    C --> D{Defective Items ≤ Permissible?}
    D -- Yes --> E[Accept Lot]
    D -- No --> F[Reject Lot]

This ensures quality control by statistically verifying conformity of window stays and fasteners.

IS 6318 - Annex A: Sampling Procedures and Conformity Criteria

A-1. Scale of Sampling (Clause 1.2)

• Sample Size depends on lot size.
• Defective units allowed as per table; exceeding this means lot rejection.

A-1.3 Inspection & Testing

• All sampled window stays and fasteners must be checked for dimensional requirements (Clause 3).
• Tested as per Clause 4.
• Any failure in requirements = defective.

A-2. Criteria for Conformity

• Lot is accepted if defective units ≤ permissible number.
• Otherwise, the lot is rejected.

This ensures quality control by statistically verifying batches with defined acceptance criteria.

flowchart LR
    LotSize[Lot Size]
    SampleSize[Sample Size]
    Inspection[Inspection & Testing]
    DefectiveCount[Count Defective Units]
    Compare[Defective Units ≤ Permissible?]
    Accept[Accept Lot]
    Reject[Reject Lot]

    LotSize --> SampleSize --> Inspection --> DefectiveCount --> Compare
    Compare -- Yes --> Accept
    Compare -- No --> Reject

IS 6318 - Annex B: Window Stay and Fastener

Key Specifications:

• Window Stay Test (Clause 4.1.1):

  • Apply a force of 40 kgf at a rate of 6 to 8 cycles/min.
  • Repeat 3,000 times in to-and-fro direction to test strength.

• Dimensions & Shape (Clause 3.1):

  • Refer to Fig. 1A (Window Stay) and Fig. 1B (Window Fastener) for typical sketches.
  • All dimensions in millimeters.
  • Surfaces must be smooth, free from defects and deformations.
  • Reinforcement with rust-proof steel wire allowed if agreed.

• Design Flexibility (Clause 3.1.1):

  • Shapes and sizes can vary if mutually agreed between manufacturer and purchaser.

Typical Window Stay & Fastener Dimensions (from Fig. 1):

Testing Summary:

Conceptual Illustration (Mermaid.js):

graph LR
A[Apply 40 kgf Force] --> B[Window Stay]
B --> C[To-and-fro motion]
C --> D[Repeat 3000 times]
D --> E[Check for deformation]

Note: For precise dimensions, refer to IS 6318 Fig. 1A & 1B. Surface finish and strength tests ensure durability and operational smoothness.