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Stopper Rods - Dirgodaz Amol Refractories Company
Refractories for Metal Casting Industry

Full Product Catalog

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General Description

Dirgodaz Amol Refractories Company manufactures various shaped refractories used in the metal casting industry.

Production Process

The above products are manufactured using different raw materials or forming processes such as isostatic pressing and casting, followed by high-temperature sintering. This production process results in high-quality parts with uniform microstructure and outstanding technical properties.

Key Advantages

  • Increased service life and reliable performance
  • Ability to cast more parts before replacement
  • Maximum geometric compatibility with other components
  • Optimal molten metal flow control with high dimensional accuracy
  • Resistance to thermal shock and chemical corrosion

Technical Features

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Physical and Mechanical Properties

  • High thermal stability
  • Excellent thermomechanical properties
  • Good thermal shock resistance
  • Low wettability
  • High resistance to erosive wear

Product Types

Carbon-Bonded Refractories for Casting

  • Graphite Stopper Rod
  • Graphite Nozzle
  • Graphite Stopper Head

Alumina-Silica Refractories for Casting

  • Nozzle
  • Well Block
  • Stopper Head

Graphite Stopper Rod

The graphite stopper is a critical component of the molten metal flow control system, used to regulate the flow of molten metal from the nozzle to the mold in casting systems.

Applications

These products are primarily used in the casting processes of various metals, including gray and ductile iron, as well as aluminum and copper alloys. Graphite stoppers are produced in open-end and closed-end types for ductile and gray iron.

Technical Specifications of Graphite Stopper Rod
Parameter SD-GS1 SD-GS2
Density (g/cm³) 2.1-2.2 2.2-2.5
Flexural Strength (kg/cm²) 100 90
Porosity (%) 12 15
Al₂O₃ (%) 40 20
SiO₂ (%) ≤40 ≤30
SiC (%) - 20
C (%) 20-30 20-40

Graphite Stopper Head

Graphite stopper heads are installed at the end of the stopper rod and are responsible for starting and stopping the molten metal flow.

Technical Specifications

  • High thermal resistance up to 1500°C
  • Low coefficient of thermal expansion
  • Excellent chemical resistance to molten metals
  • Low wear and long service life

Alumina-Silica Stopper Head

Alumina-silica stopper heads are designed for specific applications in casting metals that react with carbon-based refractories.

Technical Specifications of Alumina-Silica Stopper Head
Chemical Composition Al₂O₃: 60-75%, SiO₂: 20-35%, Others: ≤5%
Density (g/cm³) 2.9-3.3
Compressive Strength (kg/cm²) ≥850
Wear Resistance Excellent
Maximum Operating Temperature 1650°C