Mould for determination of linear shrinkage -

IS 12979: Scope & Key Specifications

• Scope: IS 12979 covers specifications for moulds used in testing linear shrinkage of materials, ensuring standardization in dimensions and quality control.

• Key Dimensions:

  • Refer to Fig. 1 in the standard for detailed mould dimensions (all in mm).
  • Tolerances follow IS 2102 (Part 1): 1980, medium class for unspecified dimensions.

• Marking & Quality:

  • Products carry the BIS Standard Mark under strict inspection and quality control per BIS Act 1986.
  • Continuous conformity checks by BIS ensure product reliability.

• Related Standards:

  • IS 292:1983 for leaded brass ingots/castings.
  • IS 2102 (Part 1): 1980 for general dimensional tolerances.

Summary Table: Dimension Tolerance Reference

Conceptual Diagram: Mould Dimension & Tolerance Flow

flowchart LR
    A[Mould Dimensions] --> B[Fig. 1 (IS 12979)]
    B --> C[Tolerances]
    C --> D[IS 2102 (Part 1): 1980]
    A --> E[Material Spec]
    E --> F[IS 292:1983]
    B --> G[Quality Control]
    G --> H[BIS Marking & Inspection]

This ensures uniformity and reliability in linear shrinkage testing moulds under IS 12979.

IS 12979: Referenced Indian Standards & Key Specifications

Referenced Indian Standards (Clause 2.1):

• IS 292:1983 — Leaded brass ingots and castings
• IS 919 (Part 1):1980 — General tolerances for linear and angular dimensions
• IS 2720 (Part 20):1966 — Methods of test for soil: Determination of linear shrinkage
• IS 2:1960 — Rules for rounding off numerical values

Key Notes:

• The equipment in IS 12979 is used with soil testing apparatus per IS 2720 (Part 20) for linear shrinkage determination.
• Dimensions and tolerances follow IS 919 (Part 1).
• Final test values must be rounded as per IS 2.
• Materials like securing screws should comply with IS 292 for brass components.
• The Standard Mark usage is governed by BIS under the Bureau of Indian Standards Act, 1986, ensuring quality and conformity.

Typical Table Format for Securing Screws (Clause 12.5)

(Refer IS 12979 Table 6 for exact values)

Summary Diagram: IS 12979 Standards Relationship

graph LR
A[IS 12979 Equipment] --> B[IS 2720 (Soil Test)]
A --> C[IS 292 (Materials)]
A --> D[IS 919 (Tolerances)]
A --> E[IS 2 (Rounding Rules)]

For detailed dimensions and tolerances, refer to IS 12979 Table 6 and relevant IS codes listed above.

IS 12979: General Requirements Summary

• Scope (Clause 1.1):
  Covers general requirements, materials, and dimensions for moulds used in determining linear shrinkage of remoulded soils.

• Referenced Standards (Clause 2.1):

  • IS 292:1983 — Leaded brass ingots and castings
  • IS 2102 (Part 1):1980 — General tolerances for linear and angular dimensions (medium class tolerances apply)

• Mould Dimensions & Tolerances (Clause 5.1):

  • Dimensions as per Fig. 1 (mould for linear shrinkage)
  • Tolerances follow IS 2102 (Part 1):1980 medium class

• Marking & Screws (Clause 12.5):

  • Marking details and securing screws dimensions are specified (all in mm)

• Quality Assurance:

  • Products must comply with BIS inspection, testing, and quality control under BIS Act, 1986
  • Use of Standard Mark governed by BIS regulations

Key Dimension Reference (Fig.1 - Mould for Linear Shrinkage)

Medium Class Tolerances (IS 2102 Part 1)

flowchart TD
    A[Start: Mould Manufacture] --> B[Refer IS 12979 Clause 5.1]
    B --> C[Dimension to Fig. 1]
    C --> D[Apply Tolerances per IS 2102 Part 1 (Medium Class

IS 12979 - Materials: Key Specifications & References

• Materials for Mould Components (Clause 4.1):
  All mould parts (body, plates, screws) shall conform to IS 292:1983 — Leaded brass ingots and castings.

• Dimensional Tolerances (Clause 5.1):

  • Dimensions per Fig. 1 (Mould for linear shrinkage).
  • Tolerances as per IS 2102 (Part 1):1980, medium class, for unspecified dimensions.

• Referenced Standards (Clause 2.1):

  • IS 292:1983 — Leaded brass ingots and castings.
  • IS 2102 (Part 1):1980 — General tolerances for linear/angular dimensions.

Summary Table for Materials:

Additional Notes:

• Use medium class tolerances for dimensions not specified in Fig. 1.
• Ensure all materials meet the quality and inspection requirements per BIS guidelines.

If you need detailed dimensional tables or tolerances, refer directly to IS 292 and IS 2102 (Part 1).

IS 12979 - Dimensions and Tolerances for Moulds

• Dimensions: As per Fig. 1 of IS 12979, all component parts of the mould must follow specified dimensions (in mm).

• Tolerances:

  • Where not specified in Fig. 1, tolerances are governed by IS 2102 (Part 1): 1980, medium class.
  • IS 2102 (Part 1) covers general tolerances for linear and angular dimensions, form, and position.

Key Points:

Typical Tolerance Values (from IS 2102 Part 1 - Medium Class):

Note: Refer to IS 2102 (Part 1) for detailed tolerance tables and angular tolerances.

flowchart LR
    A[IS 12979] --> B[Dimensions as per Fig.1]
    A --> C[Tolerances per IS 2102 (Part 1)]
    C --> D[Medium Class Tolerances]
    B --> E[Component Parts of Mould]
    D --> F[Linear and Angular Dimensions]

For precise manufacturing and quality control, always cross-check dimensions against Fig. 1 and apply IS 2102 tolerances where unspecified.

IS 12979 - Marking Specifications (Clause 6.1 & 12.5)

Marking Requirements on Each Mould (Clause 6.1):

• Manufacturer's source identification
• Batch number

These markings must be clear and indelible.

Standard Mark Usage (Clause 12.5)

• The Standard Mark indicates compliance with IS 12979 under BIS supervision.
• It assures quality via inspection, testing, and ongoing conformity checks.
• Use of the Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
• Licenses to use the Standard Mark are issued by BIS under strict conditions.

Table 6: Marking Details (Summary)

Notes:

• All dimensions are in millimeters.
• Marking must withstand handling and environmental exposure.
• Refer to BIS for licensing and permission for the Standard Mark.

flowchart TD
    A[Manufacture Mould] --> B[Mark Manufacturer's Source]
    A --> C[Mark Batch Number]
    B & C --> D[Clear & Indelible Marking]
    D --> E[Use Standard Mark (BIS License)]
    E --> F[Conformity Assurance]

For detailed licensing and marking rules, contact BIS at Manak Bhavan, New Delhi.

IS 12979: Assembly and Components Key Points

1. Components of the Mould (Clause 3.1)

• End Plates: 2 Nos.
• Securing Screws: 4 Nos.
• Mould body and parts as per Fig. 1 (dimensions in mm).

2. Material Specifications (Clause 4.1)

• All mould parts (body, plates, screws) must conform to IS 292:1983 (specifies materials for steel components).

3. Dimensions and Tolerances (Clause 5.1)

• Dimensions as per Fig. 1 of IS 12979.
• Tolerances follow IS 2102 (Part 1):1980, medium class.

4. Securing Screws (Clause 12.5)

• Detailed dimensions for securing screws are provided (refer to Table 6 in Clause 12.5).
• All dimensions in millimeters.

Summary Table: Mould Components

Notes:

• The mould assembly ensures linear shrinkage measurement.
• Use medium class tolerances for machining accuracy.
• Refer to Fig. 1 and Table 6 in IS 12979 for exact dimensions and screw sizes.

flowchart LR
    A[Mould Assembly] --> B[End Plates (2 Nos.)]
    A --> C[Securing Screws (4 Nos.)]
    A --> D[Mould Body]
    B & C & D --> E[Material: IS 292:1983]
    E --> F[Dimensions: Fig. 1 &

IS 12979: Compliance and Quality Assurance Key Points

1. Quality Assurance System:

• Products bearing the Standard Mark comply with IS 12979 under a strict system of inspection, testing, and quality control.
• This system is devised and supervised by BIS and operated by the producer.
• Continuous surveillance by BIS ensures ongoing conformity.

2. Licensing & Marking:

• Use of the Standard Mark requires a license from BIS.
• Licensing conditions ensure manufacturers maintain quality standards.
• Marking dimensions and securing screws are specified (all in mm) for moulds (see Clause 12.5).

3. Testing & Rounding:

• Test results must be rounded per IS 2:1960 rules.
• Number of significant digits retained equals those in the specified values.

4. Reference Standards:

• IS 12979 references other standards like:
  • IS 2720 (Part 20) for linear shrinkage test methods.
  • IS 292 for leaded brass ingots and castings.
  • IS (Part 1) for general tolerances.

Summary Table: Compliance Elements

flowchart LR
    A[Manufacturer] --> B[Quality Control System]
    B --> C[BIS Supervision]
    C --> D[License Issued]
    D --> E[Standard Mark on Product]
    E --> F[Continuous BIS Surveillance]
    F --> G[Product Conforms to IS 12979]

Note: For detailed dimensions and securing screws, refer to Clause 12.5 Table 6 in IS 12979.