Non-coniferous timber in converted form for general purposes
1993 Edition

Overview of Scope in IS 5966

This standard specifies requirements for timber door and window shutters, concentrating on dimensions, acceptable tolerances, and quality parameters.

Highlights on Scope:

• Applicable to wooden door and window shutters.
• Dimensions and tolerance requirements align with IS 1331:1971 for timber sizes.
• Terminology follows IS 707:1976 addressing seasoned timber.
• Numerical data rounding follows the guidelines of IS 2:1960.

Key Specifications:

Dimensions and Tolerances:

• Strict adherence required to specified tolerances for proper fit.
• Final values rounded consistent with the standard's precision.

flowchart LR
    TimberShutter[Timber Shutter] --> Dimensions[Dimensions & Tolerances]
    Dimensions --> IS1331[IS 1331:1971]
    Dimensions --> IS2[IS 2:1960 Rounding]
    TimberShutter --> Definitions[Definitions]
    Definitions --> IS707[IS 707:1976]

Refer to IS 1331 and IS 5966 for detailed dimension tables and tolerance clauses.

Summary of Key References in IS 5966

• Rounding Procedure (IS 2:1960):

  • Test outcomes must be rounded according to IS 2:1960.
  • Maintain the same significant figures as specified in IS 5966.

• Dimension and Tolerance Limits:

  • Clause 5 of IS 5966 outlines precise size limits and acceptable tolerances.

• Other Standards Referenced:

  • IS 707:1976 provides definitions and terminology.
  • Additional IS codes supply complementary requirements.

Summary Table:

For detailed size and tolerance data, specify the product or section for exact information.

Definitions in IS 5966

• IS 5966 adopts definitions from IS 707:1976, which is a glossary of timber technology terms.
• The standard itself does not provide independent definitions but relies on IS 707 for terms like seasoning, moisture content, and defects.
• Numerical data must be rounded per IS 2:1960 to maintain uniformity.

Reference Table:

Practical Guidance:

• Always refer to IS 707 when interpreting timber-related terms in IS 5966.
• Apply IS 2 rounding rules for all numerical results.

flowchart LR
    IS5966_Definitions --> IS707[Refer IS 707:1976]
    IS5966_Definitions --> IS2[Apply IS 2:1960 rounding]
    IS707 --> Timber_Terms[Timber Terminology]
    IS2 --> Rounding_Rules[Rounding Procedures]

This ensures clarity and uniform reporting.

Non-Coniferous Timber Species as per IS 1326:1992 Annex B

• Timber must be sourced from species listed in the annex of IS 1326:1992 concerning non-coniferous sawn timber.
• Moisture content limitations (Clause 6.2):
  • For timber thickness up to 50 mm: maximum 18% moisture within 10 mm from the surface.
  • For thickness over 50 mm: same 18% limit applies within 10 mm depth.
• Measurement standards:
  • Length in meters, truncated to the nearest 0.05 m.
  • Width in millimeters, rounded down to nearest 10 mm.
  • Thickness in millimeters, rounded down to nearest 5 mm.
  • Volume calculated to three decimal places in cubic meters.
• Permitted defects are governed by IS 3364 (Part 2):1976.
• Plugging of defects is prohibited.
• Defect limits vary by grade (I and II) and thickness.

Moisture Content Limits Table

Refer to IS 1326 Annex B and IS 5966 Table 1 for comprehensive species and defect limits.

flowchart LR
    NonConiferousTimber --> Species_List[Species as per IS 1326 Annex B]
    Species_List --> Moisture_Limits[Moisture Content Restrictions]
    Moisture_Limits --> Measurement_Standards[Measurement Protocols]
    Measurement_Standards --> Permissible_Defects[Allowed Defects]
    Permissible_Defects --> Grade_I_II[Grade I and II Specifications]

Ensures timber suitability for diverse general applications.

Dimensional Specifications and Permissible Variances (IS 5966 Clause 5.2)

• Minus tolerance beyond -3 mm is limited to a maximum of 10% of the quantity supplied.
• For fixed width ranges (e.g., 150 to 250 mm), minimum widths have no minus tolerance and maximum widths have no plus tolerance.

Additional Information:

• Timber sizes must comply with IS 1331:1971 for standard cut dimensions.
• These tolerances guarantee uniformity and adherence to quality standards.

Tolerance Summary Table

flowchart LR
    Order --> CheckSize{Width 40 mm?}
    CheckSize -- Yes --> NoTolerance[No tolerance (0 mm)]
    CheckSize -- No --> Tolerance[+6 mm / -3 mm]
    Tolerance --> LimitMinus[Minus tolerance 40% of supply]
    WidthRange --> WidthLimits[No minus on min, no plus on max]

This maintains dimensional accuracy per relevant standards.

Timber Grading Criteria as per IS 5966

Size Tolerances (Clause 5.2):

• Width and thickness up to 100 mm: zero tolerance allowed.
• Width and thickness exceeding 100 mm: +6 mm and -3 mm tolerances permitted.
• Minus tolerances over the limit are allowed only for up to 10% of the supply.
• For specified width intervals (e.g., 150-250 mm), no minus tolerance on minimum widths and no plus tolerance on maximum widths.

Defect Limits for Grades I & II (Clause 8.1, Table 1):

Note: Live knots are prohibited within 1.5 times the smallest thickness near joints. Defects are assessed collectively.

This grading ensures timber meets quality and structural performance requirements.

Moisture Content Specifications for Converted Timber (IS 5966 Clause 6.2)

• For timber thickness up to 50 mm, moisture content must not exceed 18% within 10 mm from the surface.
• For timber thicker than 50 mm, the same 18% limit applies within 10 mm depth.
• For seasoned timber, moisture content must conform to the specified value agreed upon in contract or order.

Measurement and Calculation:

• Length measured in meters, rounded down to the nearest 0.05 m.
• Width measured in millimeters, rounded down to nearest 10 mm.
• Thickness measured in millimeters, rounded down to nearest 5 mm.
• Volume computed in cubic meters with precision to three decimal places.

Defect Allowances (Table 1 Summary):

Moisture Content Calculation (from IS 11215):

[ MC = \frac{W_{wet} - W_{dry}}{W_{dry}} \times 100 ]

Ensuring timber moisture is within limits is critical for durability and dimensional stability.

Permissible Defects in Converted Timber (IS 5966 Clause 8.1, Table 1)

Note: Live knots are prohibited within 1.5 times the smallest thickness in joint areas.

Additional measurement tolerances apply as per thickness and size requirements.

Marking Protocols for Converted Timber (IS 5966 Clause 9.2)

• Each timber piece shall be marked visibly at a convenient location.

• The marking must include:

  • Manufacturer or source of production
  • Year of supply

• Letters used for marking should be a minimum of 20 mm in height.

• Timber may bear the BIS Standard Mark indicating conformity with IS 5966.

• The Standard Mark certifies compliance under the Bureau of Indian Standards Act, 1986, including inspection and quality control by BIS.

Marking Details Summary:

Preservation Related to Marking:

• Timber ends must be treated against cracking to a distance at least 25 mm beyond the longest split.
• End coating materials should comply with IS 1141:1973.
• Preservative treatments should follow IS 401:1982.

flowchart TD
    Timber --> Marking
    Marking --> Details{Marking Content}
    Details --> Source[Source of Manufacture]
    Details --> Year[Year of Supply]
    Details --> LetterSize[Letter Size ≥ 20 mm]
    Marking --> StandardMark[BIS Standard Mark (optional)]
    StandardMark --> BISQuality[BIS Inspection & Quality Control]

This practice ensures traceability and quality assurance.

Preservation Requirements for Timber (IS 5966)

• All timber containing sapwood must undergo preservative treatment in accordance with IS 401:1982.
• Ends of timber planks and scantlings should be coated to prevent splitting and cracking, extending at least 25 mm beyond the longest visible split.
• End coating materials must conform to IS 1141:1973.
• The end coating process should be applied immediately after timber inspection.
• Marking with the BIS Standard Mark may be used to signify adherence to preservation and quality standards.

Preservation Summary:

Additional Information:

• Preservation safeguards timber against fungal, insect, and decay damage.
• Moisture content influences preservative uptake; refer to IS 11215:1991 for moisture determination.

flowchart LR
    SapwoodPresence --> TreatmentRequired{Treatment needed?}
    TreatmentRequired -- Yes --> ApplyTreatment[Apply IS 401:1982 Treatment]
    ApplyTreatment --> EndCoating[Apply End Coating]
    EndCoating --> CoatingDetails[Coat at least (Longest split + 25mm) per IS 1141]
    CoatingDetails --> Timing[Apply immediately after inspection]
    Timing --> OptionalMarking[BIS Standard Mark (optional)]
    TreatmentRequired -- No --> NoTreatment[No treatment required]

These measures ensure timber longevity and compliance.

Measurement and Evaluation of Defects in Converted Timber (IS 5966 Clause 8.1, Table 1)

Measurement Procedures (Clauses 5 & 6.2):

• Length to be measured in meters, rounded down to nearest 0.05 m.
• Width in millimeters, rounded down to nearest 10 mm.
• Thickness in millimeters, rounded down to nearest 5 mm.
• Volume computed in cubic meters to three decimals.

These methods ensure consistent defect evaluation and reporting.

Use of BIS Standard Mark under IS 5966 Clause 9.2

• The Standard Mark signifies compliance with IS 5966 and quality assurance under BIS oversight.
• Issued per the Bureau of Indian Standards Act, 1986.
• Products bearing this mark have undergone inspection, testing, and continuous quality monitoring by BIS.

Highlights:

• The Standard Mark can be affixed to converted timber pieces meeting all IS 5966 specifications.
• Licenses for use of the mark are granted by BIS.
• The mark ensures conformity to dimensional, quality, and preservation standards.

Related Standards:

• Sapwood preservation as per IS 401:1982.
• End coating per IS 1141:1973, extending at least 25 mm beyond the longest split.

Summary Table for Standard Mark:

flowchart LR
    Manufacturer --> QualitySystem[Quality Control System]
    QualitySystem --> Inspection[Inspection and Testing]
    Inspection --> ComplianceCheck{Meets IS 5966?}
    ComplianceCheck -- Yes --> ApplyMark[Apply Standard Mark]
    ApplyMark --> BISSurveillance[BIS Continuous Monitoring]
    ComplianceCheck -- No --> NoMark[No Marking]

This process assures timber products meet IS 5966 requirements.

Guidelines for Rounding Numerical Values (IS 5966 and IS 2:1960)

• All final numerical results must be rounded according to the rules in IS 2:1960.
• The number of significant digits in the rounded figure must match that in the original IS 5966 specification.
• This maintains consistency and accuracy in test data reporting.

Rounding Rules (IS 2:1960):

Example:

• Specified value: 12.3 (3 significant figures)
• Computed value: 12.3456 → Rounded to 12.3

Timber Size Tolerances (Clause 5.2):

• Minus tolerance beyond -3 mm is allowed only in up to 10% of the delivered quantity.
• For specified width ranges, no minus tolerance on minimum or plus tolerance on maximum widths.

flowchart TD
    Value --> CheckSigDigits{Number of Significant Figures}
    CheckSigDigits --> MatchStandard[Match IS 5966]
    MatchStandard --> ApplyRounding[Apply IS 2:1960 Rounding]
    ApplyRounding --> FinalValue[Final Rounded Number]

This ensures clarity and conformity in data presentation.

Summary of Revisions and Amendments to IS 5966

• Amendment 1 (March 2002): Updated provisions for non-coniferous converted timber.
• Related standards referenced include:
  • IS 1331:1971 for timber sizing.
  • IS 401:1982 for timber preservation.
  • IS 707:1976 for terminology.

Amendment Highlights:

• Clarified or modified specifications without full standard reissue.
• Adjusted dimensions, grading criteria, or preservation methods to reflect current best practices.

Typical Specification Changes:

flowchart LR
    IS5966_1993 --> Amendment1_2002
    Amendment1_2002 --> UpdatedSizes[Updated Sizes (IS 1331)]
    Amendment1_2002 --> UpdatedPreservation[Updated Preservation (IS 401)]
    Amendment1_2002 --> UpdatedTerminology[Updated Terminology (IS 707)]

Refer to respective IS codes for detailed information and formulae.

IS 5966 Primary Focus: Specifications for Timber Doors

Important Annexes and Summaries:

• Dimensions and Tolerances (Clause 5):

  • Door sizes adhere to IS 1331:1971.
  • Common door thicknesses include 35 mm, 40 mm, and 45 mm.
  • Width and height tolerances are generally ±2 mm.

• Reference to IS 707:1976:

  • Defines species, grading, and seasoning.
  • Controls moisture content typically around 12 ± 2%.

Typical Dimension Table (Based on IS 1331):

Notes:

• Tolerances: ±2 mm for length and width; ±1 mm for thickness.
• Moisture content: 10-15% as per IS 707.
• Timber quality must meet IS 2202 for seasoning and defect control.

flowchart LR
  IS5966 --> Dimensions_IS1331[Dimensions & Tolerances (IS 1331)]
  IS5966 --> TimberQuality_IS707[Timber Quality (IS 707)]
  Dimensions_IS1331 --> Thickness[Thickness 35-45 mm]
  Dimensions_IS1331 --> Width[Width 600-1000 mm]
  Dimensions_IS1331 --> Height[Height 1800-2100 mm]
  TimberQuality_IS707 --> Moisture[Moisture 12±2%]
  TimberQuality_IS707 --> Seasoned[Seasoned Timber]

Review IS 5966 annexes and IS 1331 tables for precise door design and timber selection.