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Description

INTRODUCTION:

AFCIBREAK is a breakdown agent used for sodium silicate binder system to improve the collapsibility of cores & moulds produced by Carbon dioxide process and self-setting process. With use of Sodium Silicate & CO2 process, retains their strength even at higher temperature. This retained high strength makes core & mould knockout very difficult. AFCIBREAK is a breakdown agent, not only eases removal of sand from cores & moulds from the casting surface, but also improves the strength of cores, improves surface finish of the castings & imparts very easy knockout properties. This is mostly recommended to be added with AFCISIL 45.

SPECIFICATION:

SR. NO. CODE PRODUCT PROPERTIES CHARACTERISTICS
    1. A051 AFCIBREAK – 51

       Powder

 a)    C.S.H          :  60 – 70

b)    VM             : 50 – 70

c)    ASH            : 20 – 30

 Form :  Powder

Colour : Reddish Black
    2.   A052M AFCIBREAK-52 M

 

 a) Density : 1.00 – 1.30

b) Specific Gravity: 1.00 -1.30+/0.04.

c) Viscosity: 80 – 140 Sec.

 Form :   Liquid

Colour : Light Reddish
3 A052L AFCIBREAK-52 L a) Density : 1.00 – 1.20

b) Specific Gravity: 1.00 -1.20+/0.04.

c) Viscosity: 80 – 100 Sec.

 Form :   Liquid

Colour : Reddish
APPLICATION:
  1. Generally 1% to 3% of AFCIBREAK is sufficient to give good collapsibility. However addition may very with the type of alloy being used, temperature, and amount of binder used, type of sand & casting configuration.
  2. Regular monitoring of trial lots will lead to optimum addition percentages.
  3. For good results it is necessary to add AFCIBREAK before addition of AFCISIL 45 or any other foundry grade Sodium Silicate binders.

RECOMMENDED MIXING PROCEDURE:

  1. Charge the dry sand, free from clay in the Muller mixer.
  2. Add 1 – 3 % of AFICBREAK agent.
  3. Mix for 2 / 3 minutes.
  4. Add AFCISIL – 45-silicate binder about (5 – 7 %) depending on sand fineness.
  5. Mix for 3/5 minutes.
  6. Discharge the above mixture, which is ready for making moulds & cores.

ADVANTAGES:

  1. Reduces fettling time of Cores & Moulds.
  2. Improves casting finish.
  3. Reduces tendency of hot tear & distortion of castings.
  4. Produces sand suitable for reclamation.
  5. Does not deteriorate on storage.
  6. With proper addition, reduces the percentage of binder addition required to produce satisfactory bond.
  7. Imparts easy knockout properties.

STANDARD PACKING:  AFCIBREAK-51 Powder – 40 Kg HDPE bags.

                                           AFCIBREAK 52 M   – 25 Kg. Carboys / 250 Kg. Barrels.

                                           AFCIBREAK 52 L – 25 Kg. Carboys / 250 Kg. Barrels.

STORAGE: Preferably store in cool place & in covered condition

PRECAUTIONS:

  1. It is non – Poisonous & safe to use.
  2. Prolonged mixing should be avoided, as the frictional heat will cause premature hardening.
  3. Mixed sand lot must be covered with wet cloth to prolong bench life.
  4. Normal safety aids like goggles & hand gloves should be used,
  5. Keep plenty of water & First aid ready in case of emergency.

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