Exothermic Insulating Riser Sleeve-Neck down/SJ-Series

Highly insulating and exothermic feeder sleeve for iron and steel castings.

There are many different shapes are available in our product family such as open, blind, oval, neck down and side types, etc..

The Riser sleeve product with its low density, high strength, and good toughness is suitable for various grades of cast steel, cast iron, and alloy castings, as well as various molding processes.

Overview of Exothermic Insulating Riser Sleeve

The product adopts new materials such as exothermic agent, insulation materials and binder to develop high-efficiency Exothermic Insulating Riser Sleeves.

Our Exothermic Insulating Riser Sleeves according to different shapes are divided into oval, neck-down, cylindrical, side type, flexible board and core-shot sleeves (Mainly used for small to medium iron and steel castings)

Cylindrical, neck-down and side riser sleeves shall also be provided with riser caps because you may choose the type of risers as you need: open riser or blind riser.

With low density and precise dimensions, core-shot sleeves(AN series) can be used in various ferrous and non-ferrous metal castings. And it can be set on the molding plate or embedded in the mould after molding.

Heating mechanism

The exothermic insulating riser sleeves adopt high-quality insulation material and high-efficiency exothermic agent. The rapid cooling effect is very small. Once the molten steel is injected into the riser sleeve, the heating reaction is excited, and the riser sleeve will heat it greatly. After the heating reaction ends, the riser sleeve insulation material begins to work, ensuring that the solidification time of the molten metal in the riser is effectively extended.It has the functions of heat insulation at first, generating heat in the middle, and heat preservation for a long time at the end to achieve the best feeding effect.

Specification of SJ-Series Neck Down Riser Sleeves

No. Specification


Effective Module


Geometric Module


Boundary Dimension (cm) Volume(ml)
D1 d1 D d H h
SJ80 Φ80×Φ40×100 1.99 1.37 70 39 100 78 100 27 420
SJ150 Φ150×Φ70×190 3.71 2.56 120 74 192 147 192 68 2780
SJ180 Φ180×Φ90×220 4.33 2.98 132 88 222 175 222 90 4440
SJ200 Φ200×Φ100×250 4.93 3.40 150 100 250 200 250 100 6054
SJ230 Φ230×Φ110×280 5.54 3.82 160 113 278 225 278 110 9320
SJ250 Φ250×Φ130×310 5.99 4.28 180 126 310 252 310 120 12960
SJ300 Φ300×Φ150×360 7.08 5.06 210 150 360 300 360 140 21310
SJ350 Φ350×Φ180×410 8.31 5.94 240 178 410 355 410 155 34190

Advantages of HuaGuang’s Exothermic Insulating Riser Sleeves

The solidification time is 2.55-2.9 times longer than that of the sand riser, the molten metal used for feeding is reduced by 50-70%, and the product yield is increased by 25-30%. When the processing technology is used on the top riser, the contact area between the riser and the castings is reduced. Compared with the ordinary sand riser, the cutting and grinding areas are reduced by 60-70%, which greatly reduces the fettling costs, thereby reducing the production costs.

The use of the exothermic insulating riser shall eliminate the shrinkage defects that can’t be overcome by sand risers. Using automatic molding lines ensures the production of stable castings. Due to its exothermic properties, it can be used on cold risers to simplify runner systems, which is particularly beneficial for ductile iron parts.


Compared with the ordinary sand riser, the strength of the riser is increased by 50-70%. Advantages such as Less damage during modeling, good air permeability, uniform riser sleeve wall thickness and a V-shaped cone on the top of blind riser shall improve the heat insulation and feeding effect, and at the same time make the riser sleeve heat and thermal insulation properties and physical properties more stable.

Fiber composite insulating riser sleeve

The main features of the Fiber Composite Insulating Riser Sleeve are lightweight, high fire-resistant, small high-temperature linear shrinkage, high show porosity, small heat loss rate, and good thermal insulation performance. After use, not only the shrinkage and dispersed shrinkage inside the casting are eliminated, and the quality of the casting is improved, but also the efficiency of the riser feeding is significantly increased, the amount of molten steel in the riser is reduced, the actual yield of the casting is increased and the cost is decreased. It has been widely used in castings including cast steel, cast iron, and non-ferrous alloys, etc.