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:
- 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.
- Regular monitoring of trial lots will lead to optimum addition percentages.
- 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:
- Charge the dry sand, free from clay in the Muller mixer.
- Add 1 – 3 % of AFICBREAK agent.
- Mix for 2 / 3 minutes.
- Add AFCISIL – 45-silicate binder about (5 – 7 %) depending on sand fineness.
- Mix for 3/5 minutes.
- Discharge the above mixture, which is ready for making moulds & cores.
ADVANTAGES:
- Reduces fettling time of Cores & Moulds.
- Improves casting finish.
- Reduces tendency of hot tear & distortion of castings.
- Produces sand suitable for reclamation.
- Does not deteriorate on storage.
- With proper addition, reduces the percentage of binder addition required to produce satisfactory bond.
- 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:
- It is non – Poisonous & safe to use.
- Prolonged mixing should be avoided, as the frictional heat will cause premature hardening.
- Mixed sand lot must be covered with wet cloth to prolong bench life.
- Normal safety aids like goggles & hand gloves should be used,
- Keep plenty of water & First aid ready in case of emergency.