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
- Faster rate of curing hence higher Productivity.
- Excellent hot strength, allows it to be used for steel, ductile, CI and even for non ferrous Casting.
- Excellent surface finish and collapsibility.
- Reclamation of sand up to 95% is possible and use of reclaimed sand leads to reduced binder additions.
- Excellent flowability of sand facilitates easy production of intricate cores and moulds.
- 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
- C) Range of COTRAN PART B are available for achieving desired strip time.
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.
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.
