FURAN 2 PART NOBAKE SYSTEM
General Description
COTRAN is a acid cured furan resin. This is 2 part acid cured system used for large mould & cores in C.I., S.G. Iron & steel foundries.
Purpose
Furfuryl alcohol is readly available & cheaper than most plasticizers like phenol etc. Furan is nontoxic, nonflammable & therefore can be handled easily.
Benefits
1) Faster rate of curing hence higher Productivity.
2) Excellent hot strength, allows it to be used for steel, ductile, CI and even for non ferrous Casting.
3) Excellent surface finish and collapsibility.
4) Reclamation of sand up to 95% is possible and use of reclaimed sand leads to reduced binder additions.
5) Excellent flowability of sand facilitates easy production of intricate cores and moulds.
6) Shelf life is better than phenolic resin - acid catalyst systems & odour while mixing is less.
Instruction for use
Choose a dry sand having AFS No. 50-55 with low acid demand value & clay content 0.2 - 0.5 % .
If used on batch mixer, than add COTRAN PART B - mix for 1½ followed by COTRAN PART A mix for 2 min.
Addition Levels
| SAND | 50-55 AFS (New) : 100 % |
| COTRAN PART A | 1.8 to ±0.2 % of Sand. |
| COTRAN PART B | 50 ± 20 % of Part A |
The Following factors directly effect the bench life & strip time of the mixed sand.
a) Increase in BENCH LIFE
Lower proportion of COTRAN PART-B
b) Decrease in BENCH LIFE
Higher proportion of COTRAN PART-B
The COTRAN PART B level can be varied from 30-70% to influence to bench life. Shop floor adjustment needs to be made based on actual trials.
C) Range of COTRAN PART B are available for achieving desired strip time.
New Sand with COTRAN PART B
| BENCH LIFE | STRIP TIME |
| (Minutes) 10 ± 2 | (Minutes) 40 ± 10 |
Sand Test Result
| SAND (NEW) | 100 % |
| COTRAN PART A | 1.8 ± 0.2 % |
| COTRAN PART B | 50 ± 20 % of part A |
| Time after sand mix Preparation | Compression strength kg/cm2 |
| 12 - 15min | 10 ± 2 |
| 1st hrs | 24 ± 2 |
| 2nd hrs | 40 ± 2 |
| 4th hrs | 60 ± 2 |
Standard Packing
COTRAN PART A : 240 kg in Steel Barrel
COTRAN PART B : 50/100 kg is Plastic Carboys
Recommendation for Best result:
1) Sand must be dry free from carbonates and chlorides with clay not more than 0.5 % Max.
2) Binder (Resin) and catalyst addition may be varied according to nature of sand climatic conditions and bench life required.
3) Water base coating are preferred.
Precaution :
Contact with Part A & Part B, should be avoided.
In case of -
1) Contact with skin : wash with soap water
2) Contact with eyes : wash out throughly with water and consult eye specialist immediately.
3) Spillage : Do not flush with water, which can contaminate the sewage, cover the spillage with sand or saw dust and disposal the waste recommended disposal site.
