Exothermic Sleeves

Exothermic Riser Sleeves Manufacturer in Rajkot, Gujarat

Nexus Technologies manufactures highly exothermic riser sleeves for iron, steel and non-ferrous foundries. On contact with molten metal, the sleeve material reacts and generates intense heat, keeping the metal in the feeder liquid for longer so it can feed the casting as it solidifies and shrinks.

The result is fewer shrinkage defects, smaller feeders and higher casting yield. Our range covers open, blind (William core), neck-down, oval and BWC sleeves, together with exothermic boards and hot tops for applications where a standard sleeve does not fit.

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Highly Exothermic Open Sleeves — Nexus Technologies, Rajkot

Highly Exothermic Open Sleeves

Cylindrical sleeves that are critical components of the feeder system. Their primary function is to feed additional molten metal into the casting to compensate for volume loss during solidification.

Key Features

  • Design & Application: These cylindrical sleeves are easy to install in open riser systems, making them perfect for vertical feeding.
  • Exothermic Performance: Upon contact with molten metal, they generate intense heat that keeps the metal in the feeder liquid for longer, improving flow and maximizing feeding efficiency.
  • Dimensions: Available in a wide range of internal diameters and heights to accommodate any specific casting requirement.

Key Advantages

✓ Fewer Defects✓ Optimized Feeder Size✓ Higher Yield✓ Reduced Finishing
Highly Exothermic Blind William Core Sleeve — Nexus Technologies, Rajkot

Highly Exothermic Blind William Core Sleeve

Cylindrical sleeves that are critical components of the feeder system. Their primary function is to feed additional molten metal into the casting to compensate for volume loss during solidification.

Key Features

  • Blind Design: Features a closed bottom, making it perfectly suited for side risers and one-way feeding applications. This ensures zero metal leakage while promoting precise, directional cooling.
  • Exothermic Performance: Generates an intense heat reaction upon contact with molten metal, keeping the metal inside the sleeve liquid for a much longer period to feed the casting and prevent shrinkage.

Key Advantages

✓ Enhanced Soundness✓ Maximized Yield✓ Less Finishing Work
Highly Exothermic Neck Down Sleeves — Nexus Technologies, Rajkot

Highly Exothermic Neck Down Sleeves

Neck-Down Exothermic Sleeves are standard foundry consumables engineered for highly targeted metal feeding. Their heat-generating properties and tapered base ensure precise delivery of molten metal exactly where the casting needs it most.

Key Features

  • Directional Cooling: The narrowed base creates a thermal choke point, perfectly guiding the solidification process.
  • Targeted Feeding: Concentrates the flow of molten metal directly to the most critical sections of the casting.
  • Easy Break-Off: Engineered for a clean snap-off, drastically reducing the time spent on post-casting cutting and grinding.
  • Extended Liquid State: Instantly generates intense heat upon contact with molten metal, keeping the riser liquid longer to eliminate shrinkage in the mold.

Key Advantages

✓ High-Efficiency Feeding✓ Optimized Riser Volume✓ Maximized Yield✓ Reduced Finishing
Highly Exothermic Oval Sleeves — Nexus Technologies, Rajkot

Highly Exothermic Oval Sleeves

Oval Exothermic Sleeves are essential foundry consumables, perfectly engineered for applications that demand maximum feeding efficiency within limited mold spaces.

Key Features

  • Oval Design: Specifically engineered for narrow or space-constrained molds. The wider cross-section efficiently feeds larger surface areas without requiring extra sleeve height.
  • Open-Top Design: Facilitates direct metal entry from the top during pouring — ideal for vertical riser placements, with superior thermal control where the sleeve meets the casting.
  • Exothermic Performance: Instantly generates intense heat upon contact with molten metal, delaying the cooling process in the riser to keep the metal liquid much longer for effective feeding.

Key Advantages

✓ Maximized Yield✓ Targeted Feeding✓ Space-Efficient
Highly Exothermic Blind (BWC) Circle — Nexus Technologies, Rajkot

Highly Exothermic Blind (BWC) Circle

A compact, high-performance feeding aid engineered to significantly boost riser efficiency. It delivers intense, localized heat exactly where it is needed, without requiring any alterations to your existing riser geometry.

Key Features

  • Intense Exothermic Reaction: Instantly generates localized heat upon contact with molten metal, preventing premature freezing at the riser head and keeping the feeder metal liquid for longer.
  • Optimized Lid Structure: Available in classic disc or dome shapes, precisely sized to match standard open riser or sleeve diameters and crafted from highly reactive compounds bonded with a lightweight refractory.
  • Instant Ignition: Self-ignites the moment liquid metal makes contact, sealing the top of the riser and radiating clean, controlled heat straight down into the casting.

Key Advantages

✓ Maximized Efficiency✓ Superior Soundness✓ Reduced Metal Waste✓ Drop-In Upgrade✓ Universal Fit
Exothermic Boards — Nexus Technologies, Rajkot

Exothermic Boards

A high-performance, heat-generating solution engineered for foundry applications where conventional sleeves are unsuitable. Designed to maximize metal yield, precisely control shrinkage, and drive optimal directional solidification.

Key Features

  • Flat, Formed Design: Available in multiple sizes, thicknesses, and classic disc or rectangular shapes. It positions easily and perfectly against the mold cavity or core.
  • Targeted Heat Generation: Ignites instantly upon contact with molten metal to deliver intense, localized heat, delaying solidification in critical, last-to-freeze casting zones.
  • Flexible Placement: Can be seamlessly glued, pinned, or inserted directly into the mold wall — the ultimate solution for complex geometries where standard sleeves cannot be used.

Key Advantages

✓ Optimized Feeding✓ Versatile Fit✓ Defect Prevention✓ Active Heat Generation✓ Universal Compatibility
Exothermic Hot Top — Nexus Technologies, Rajkot

Exothermic Hot Top

A highly efficient, continuous reservoir of liquid metal for cast iron molds — combining an intense exothermic reaction with superior thermal insulation to keep feeder metal molten until the ingot has fully solidified.

Key Features

  • Liquid Metal Reservoir: Acts as a highly efficient, continuous reservoir of liquid metal for cast iron molds.
  • Dual-Action Performance: Delivers a powerful combination of intense exothermic reaction and superior thermal insulation.
  • Controlled Solidification: Ensures the feeder metal remains completely molten until the entire ingot body has safely and fully solidified.

Key Advantages

✓ Defect-Free Ingots✓ Maximized Yield✓ Directional Solidification

Frequently Asked Questions

What is an exothermic riser sleeve?+

An exothermic riser sleeve is a heat-generating lining placed around a feeder (riser) in the mould. When molten metal touches it, the sleeve ignites and releases heat, delaying solidification in the riser so it keeps feeding the casting and prevents shrinkage porosity.

When should I use an exothermic sleeve instead of an insulating sleeve?+

Exothermic sleeves are preferred when you need maximum feeding efficiency — heavy sections, steel castings, or when you want to reduce riser size as far as possible. Insulating sleeves are a clean, cost-effective choice where heat retention alone is enough.

Which sizes of exothermic sleeves are available?+

Our exothermic open sleeves are available in a wide range of internal diameters and heights. Share your casting and feeder requirements and our team will recommend the right sleeve type and size.

Where is Nexus Technologies located?+

Our manufacturing facility is at Khambhala, Rajkot, Gujarat. We supply foundries across India and export internationally.

Explore Our Other Product Ranges

Insulating Riser Sleeves →Foundry Consumables →Filters, Perlite & Graphite →
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