AN ESTER CURED PHENOL FORMALDEHYDE RESIN
General Description
COTSET is a phenol formaldehyde resin which is activated by ester. It is used for making mould & cores production suitable for ferrous steel & nonferrous casting. COTSET PART A is a highly alkaline phenolic resin. COTACT PART B is an ester.
Purpose
Convetional alkyd resin system require higher setting time up to 70-80 minutes, whereas COTSET - has faster setting time up to 45 - 50 min., which enables production of mould at faster rate.
Benefits
- Excellent dimensional accuracy.
- high mould & core strength.
- Good breakdown properties.
- Low emission of fumes during pouring.
- Superior casting finish.
- Good resistence to sagging.
- Faster rate of production.
- Low gas evolutuion.
Instruction for use
Choose a dry sand having AFS no. 50-55 with low acid demand value & clay content 0.5 % max. If used on batch mixer, than add COTACT PART B-mix for 11/2 mix for 11/2 min.
Addition Levels
| SAND 50-55 AFS (New) | 100 % |
| COTACT PART A | 2 ± 0.2 % of sand |
| COTACT PART B | 25 ± 5.0 % 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 COTACT PART-B
- b) Decrease in BENCH LIFE Higher proportion of COTACT PART-B
- C) Range of COTACT PART B are available for achieving desired strip time.
The COTACT PART B level can be varied from 40-60 % to influence the B e n c h Life. Shop floor adjustment needs to be made based on actual trials.
New Sand with COTACT PART B
| BENCH LIFE | STRIP TIME |
| 5 ± 25 min | 40 ± 10 min |
Sand Test Result
| SAND(NEW) | 100 % | COTSET PART A | 2 ± 0.2% of sand | COTSET PART B | 25 ± 5% COTSET Part A part |
| Time after sand mix Preparation | Compression strength kg/cm2 |
| 1st hrs | 10 ± 2 | 2nd hrs | 20 ± 2 |
| 4th hrs | 40 ± 2 |
| 24th hrs | 40 ± 2 |
Standard Packing
COTSET PART A : 250 kg in Steel Barrel
COTSET PART B : 50kg Carboys
Shelf Life & Storage
Shelf life is two months from the date of manufacturing. It is therefore recommended that the material should be used within specified time period COTSET PART A & COTACT PART B is a strong organic compound & Direct Contact with skin or body should be avoided.
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 wash & seek medial advice 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.
