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 (New) 100 %
COTSET PART A 2 ± 0.2 % of sand
COTACT PART B 25 ± 5.0 % of part A
The following factor directly effect the bench life & strip time of the mixed sand.
A) Increse in BENCH LIFE
Lower proportion of COTACT PART B
B) Decrease in BENCHLIFE
Higher proportion of COTACT PART B
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.
C) Range of COTACT PART B are available for achieving desired strip time.
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 plastic (HDPE) Barrel
COTSET PART B : 50 kg Carboy
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 disposed the waste to recommended disposal site.
