AN ACID CURED PHENOL FORMALDEHYDE RESIN
General Description
COTSOL is an acid cured Phenol formaldehyde resin. This is two part acid cured cold set system used for production of large mould and cores in ferrous and non ferrous casting.
Purpose
Conventional alkyd resin system require higher setting time up to 70-80 minutes, whereas COTSOL - has faster setting time up to 45 - 50 minutes which enables production of mould at faster rate.
Benefits
» Mould & Core have high strengths, good sag resistance.
» Reclaimed sands can be reused upto 80-85%.
» COTSOL has good hot strengths compared to alkyd binder systems, hence minimum metallurgical defects.
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 COTCAT PART B - mix for 11/2
followed by COTSOL PART A mix for 2 min.
Addition Levels
SAND: 50-55 AFS (New) : 100 %
COTSOL PART A ±: 2 0.2 % of Sand.
COTSOL PART B ±: 50 10 % 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 COTCAT PART-B
b) Decrease in BENCH LIFE ; Higher proportion of COTCAT PART-B
The COTCAT PART B level can be varied from 40-60% to influence to bench life. Shop floor adjustment needs to be made based on actual trials.
c) Range of COTCAT PART B are available for achieving desired strip time.
New Sand with COTCAT PART B
| BENCH LIFE | STRIP TIME |
| (Minutes) 10 ± 2 | (Minutes) 50 ±10 |
Sand Test Result
| SAND (NEW) : | 100 % |
| COTSOL PART A | 2 ± 0.2 % |
| COTSOL PART B | 50 ± 10 % |
| Time after sand mix Preparation | Compression strength kg/cm2 |
| 1st hrs | 10 ± 2 |
| 2nd hrs | 22 ± 2 |
| 4th hrs | 50 ± 2 |
| 24th hrs | 60 ± 2 |
Standard Packing
COTSOL PART A : 50 kg in M S. Drum &
200 kg in M. S. Drum
COTSOL PART A : 50 kg in Poly Carboys &
100 kg in Poly Carboys
Shelf Life & Storage
COTSOL PART A has a shelf life of 2 months @ 300
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.
