wooden box for microscope slides

IS 7850: Scope - Key Specifications & Sampling Criteria

Scope:
IS 7850 covers the standard requirements for timber boxes including dimensions, tolerances, and manufacturing details.

Key Sampling & Conformity Criteria (Clause 2.1 & Table 1)

• For lots ≤ 50 boxes, sample size and criteria are mutually agreed.
• The lot is conforming if defective boxes ≤ permissible number.

Testing Requirements (Clause 1.3.2)

• Dimensions and tolerances per Clause 4.
• Manufacturing details per Clause 6.
• Sampling per Table 1.

Reference Standards

• Definitions per IS 707:1968+ (Timber & timber products glossary).
• Rounding off rules applied.

This ensures quality control through random sampling and clear acceptance criteria for timber box lots.

IS 7850 - Definitions (Clause 2.1)

• Definitions in IS 7850 refer to those in IS 707:1968+, covering timber and timber product terminology.
• Key terms include species names, timber defects, and quality criteria.

Sampling & Conformity (Clause 1.3, Table 1)

• Lot accepted if defectives ≤ permissible number.

Timber Species (Clause 3.1)

Frame Work Species Examples:

Slide Rack Species Examples:

Notes:

• For lot size ≤ 50, sample size & criteria agreed between purchaser & supplier.
• Refer IS 707 for detailed timber terms and defect definitions.
• Sampling follows random method per IS 7850.

flowchart TD
    A[Lot of Timber Boxes] --> B{Select Sample Size}
    B -->|Based on Lot Size| C[Sample Boxes]
    C --> D{Count Defectives}
    D -->|Defectives ≤ Permissible

IS 7850 - Materials: Key Formulas, Tables & Specifications

1. Sampling & Conformity (Clause 2.1 & 1.3)

• Sampling Table for Lot Size & Defectives:

• Note: For lots ≤ 50 boxes, sample size & criteria agreed between purchaser & supplier.

2. Timber Species (Clause 3.1)

• Species for Framework:

• Species for Slide Rack:

3. Standards & References

• Definitions per IS 707-1968+ (Glossary for timber & timber products).
• Sampling & testing methods ensure quality control.
• Contact BIS regional offices for official clarifications.

flowchart TD

IS 7850: Dimensions and Tolerances for Boxes

• Overall Dimension Tolerance: ±1 mm (Clause 4.2)
• Plywood Thickness: 5 mm for top and bottom, Type BC WWR Grade as per IS 303-1975 (Clause 3.2)
• Dimension Reference: Boxes must conform to dimensions shown in Fig. 1 (Clause 4.1)

Summary Table for Dimensions and Tolerances

Notes:

• All boxes selected must be tested for dimensions and tolerances (Clause 1.3.2).
• Manufacturing details should comply with Clause 6.

flowchart TD
    A[Box Dimensions] --> B[Check Overall Dimensions ±1 mm]
    B --> C[Verify Plywood Thickness = 5 mm]
    C --> D[Conformity to Fig. 1 Dimensions]
    D --> E[Manufacturing Details Check (Clause 6)]

This ensures dimensional accuracy and material conformity per IS 7850.

IS 7850 — Design and Construction: Key Specifications and Tables

1. Criteria for Conformity (Clause 2.1)

• Lot acceptance is based on random sampling.
• Number of defective boxes must not exceed permissible limits in Table 1 (not fully provided here).
• Testing includes dimensions, tolerances, and manufacturing details (Clause 1.3.2).

2. Species of Timber for Construction (Clause 3.1)

• Frame Work Species (Trade Name | Botanical Name | Abbreviation):

  Trade Name	Botanical Name	Abbreviation
  Aini	Artocarpus hirsutus Lamk.	AIN
  Amari	Amoora spp.	AMA
  Badam	Terminalia procera	BAD
  Chir	Pinus roxburghii Sargent	CHR
  Deodar	Cedrus deodara D. Don	DEO
  Sissoo	Dalbergia sissoo Roxb.	SIS
  Teak	Tectona grandis Linn. f.	TEA

• Slide Rack Species (selected):

  Trade Name	Botanical Name	Abbreviation
  Birch	Betula spp.	BIR
  Ebony	Diospyros spp.	EBO
  Gamari	Gmelina arborea Roxb.	GAM
  Walnut	Juglans spp.	WAL

3. Design Notes

• Use IS 707:1968+ for timber definitions and rounding rules.
• Ensure timber species conform to the above for durability and structural integrity.
• Follow dimensional tolerances as per Clause 4 (not detailed here).

Summary Diagram: Timber Selection Process

flowchart TD
    A[Start: Design Requirements] --> B{Select Timber Species}
    B -->|Frame Work| C[Refer Clause 3.1 A-1 Table]
    B -->|Slide Rack| D[Refer Clause 3.1 A-2 Table]
    C -->

Workmanship and Finish: IS 7850 Key Points

1. Visual Examination (Clause 1.2)

• All boxes in a lot must be visually inspected for workmanship and finish defects.
• Boxes failing this are rejected outright.
• Only visually accepted boxes proceed to further testing.

2. Sampling and Testing (Clause 1.3 & Table 1)

• Sample size and permissible defectives depend on lot size:

• For lots ≤ 50, sampling is mutually agreed.

3. Dimension & Manufacturing Details (Clause 1.3.2)

• Selected boxes undergo dimensional and manufacturing detail tests as per clauses 4 and 6.

Summary Flow

flowchart TD
    A[Lot Received] --> B[Visual Inspection for Workmanship & Finish]
    B -- Pass --> C[Select Samples as per Table 1]
    B -- Fail --> D[Reject Boxes]
    C --> E[Dimensional & Manufacturing Tests]
    E --> F[Accept or Reject Lot based on Defectives]

Note: Strict adherence to visual quality and sampling criteria ensures conformity to IS 7850 workmanship and finish standards.

IS 7850: Sampling and Testing Key Points

Sampling Size & Criteria (Table 1)

• For lots ≤ 50 boxes, sample size & criteria are mutually agreed.
• Lot conforms if defective boxes ≤ permissible defectives.

Sampling Method

• Samples must be selected randomly.
• Follow procedures of IS 4905-1968 for randomness assurance.

Summary

• Select sample size per lot size.
• Test samples; if defectives exceed limits, lot is rejected.
• Random selection ensures unbiased testing.

flowchart TD
    A[Start: Lot Size] --> B{Lot Size}
    B -->|≤50| C[Agree sample size with purchaser]
    B -->|>50| D[Select sample size from Table 1]
    D --> E[Test samples]
    E --> F{Defectives ≤ permissible?}
    F -->|Yes| G[Lot Accepted]
    F -->|No| H[Lot Rejected]

This ensures quality control per IS 7850 standards.

IS 7850: Marking and Packaging - Key Points

Marking (Clause 8.1 & 8.1.1):
Each box shall be clearly and indelibly marked with:

• Manufacturer's name/initials or recognized trademark
• Year of manufacture
• Optionally, the Standard Mark (IS mark)

Sampling & Criteria for Conformity (Clause 1.3 & 2.1):

• Sampling is random; lot conformity is based on permissible defective boxes.
• Sample size and allowable defective counts depend on lot size as per Table 1 below.

• For lots ≤ 50 boxes, sample size and criteria are mutually agreed.

Summary Diagram: Sampling & Marking Process

flowchart TD
    A[Start: Lot Received] --> B[Select Sample Size (Table 1)]
    B --> C{Count Defective Boxes}
    C -->|Defectives ≤ Permissible| D[Lot Accepted]
    C -->|Defectives > Permissible| E[Lot Rejected]
    D --> F[Mark Boxes with Manufacturer Info & Year]
    F --> G[Optional: Apply Standard Mark]
    G --> H[Dispatch]

For detailed packaging specs, refer to IS 7850 Clause 8 and consult BIS regional offices listed in the standard.

IS 7850 - Species of Timber for Frame and Slide Rack

Key Specifications (Clause 3.1 & 3.1.1)

• One species per frame or slide rack.
• Moisture content ≤ 12%.
• Grain inclination ≤ 1 in 10.
• Timber free from pith, sapwood (except coniferous & Haldu), decay, shakes, insect attack, knots, cracks, splits, warp.

Species of Timber (Appendix A)

IS 7850: Sampling Procedures & Criteria for Conformity

1. Sample Size & Acceptance Criteria (Table 1)

• For lots ≤ 50 boxes, sample size & criteria are mutually agreed.
• A lot conforms if defectives ≤ permissible number.

2. Sampling Method

• Samples must be selected randomly.
• Follow IS 4905-1968 for random sampling procedure.

3. Tests on Samples

• Test all selected boxes for:
  • Dimensions & tolerances (Clause 4)
  • Manufacturing details (Clause 6)

flowchart TD
    A[Start: Lot of boxes] --> B{Lot Size}
    B -->|≤50| C[Sample size & criteria as agreed]
    B -->|51-100| D[Sample 5, Accept 0 defectives]
    B -->|101-150| E[Sample 8, Accept 0 defectives]
    B -->|151-300| F[Sample 13, Accept 1 defective]
    B -->|301-500| G[Sample 20, Accept 2 defectives]
    B -->|501-1000| H[Sample 32, Accept 3 defectives]
    B -->|>1000| I[Sample 50, Accept 5 defectives]
    D & E & F & G & H & I --> J[Random selection per IS 4905-1968]
    J --> K[Test for dimensions & manufacturing details]
    K --> L{Defectives ≤ permissible?}
    L -->|Yes| M[Lot Conforms]
    L -->|No| N[Lot Rejected]

Summary: Use Table 1 for sample size and acceptance. Select samples