STEEL & SG IRON FOUNDRY  |  SLEEVES  |   COVEREX - 707

 


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  PRODUCT BULLETIN

FOUNDRY  

COVEREX - 707

 

COVEREX - 707

An exothermic powder, which is applied to the feeder head. When the exothermic reaction of the COVEREX-707 is complete, the burnt out materials expands three times and has a strong insulating effect which reduces heat loss by radiation. Used for all grades of Iron and Steel castings / Ingots especially when feeder heads indicate a requirement for a medium sensitivity exothermic Anti-piping compound.

FUNCTIONS

Anti-piping compounds are used to prevent the considerable heat loss to atmosphere that can take place from uncovered risers. As long as the surface of the open topped feeder remains liquid, atmospheric pressure exerts its powerful influence in the feeding of casting. Unfortunately often it is lost when skulling of the metal acts as a barrier to atmospheric pressure and the riser then, only has its own gravitational mass to promote feeding.

THERMAL PROPERTIES

  • Final Insulations Value At 40 min : 0-40-0-16 Cal/Cm/Sec

  • Net Heat Loss at 20 min : 80 Cal/Cm/Sec

  • Peak of Exothermicity 4 to 5 minutes

  • Max. Temp. attained  : 1600 to 1650C

INSTRUCTIONS FOR USE

  • Pour casting to within approximately 25mm of  the riser.

  • Place required quantity of COVEREX-707 on the top of the riser so as to provide a cover of about 25 mm in depth.

  • allow the exothermic reaction to proceed.

  • top up with more metal if necessary.

ADVANTAGES

  • Better feeding hence sound castings.

  • Easy applications COVEREX - 707 is supplied in ready for used conditions.

  • Reduction in scrap more that offsets small cost involved.

  • Particularly useful where box parts or casting design makes risering difficult.

STANDARD PACKING

  • 50 kg. Bags

 

 

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