Cotshell

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Shell Molding Resin System

General Description

The COTSHELL RESIN and COTSHELL CATALYST System is a SHELL foundry binder system, commonly known as NOVOLAC RESIN, a thermoplastic phenol formaldehyde type resin. Resin is designed to provide high level of productivity by using the latest technology available to the foundry industry.

PRODUCT CHARACTERISTIC

Physical properties:-

  • 1. Appearance: - Dark brown liquid
  • 2. Viscosity: - 100±10 secs on B6 ford cup @ 30ºC
  • 3. Non volatile:- 72±0.2 %

Sand mix properties

Sand test results on washed Mangalore sand (AFS 50-55) with coating ratio 4 % resin on BOS & 18 % catalyst on BOR.

  • 1. HTS (3 MIN CURING) :- 34 ±1 Kg/ cm²
  • 2. CTS (3 MIN CURING) :- 36 ±1 Kg/ cm²
  • 3. TRANSVERSE STRENGTH: - 54 ±1 Kg/ cm²
  • 4. STICK POINT : - 98±1 ºC
  • 5. LOI :-3.6±0.2 %

Advantages

  • 1. Significant reduction in cure cycle.
  • 2. Excellent sand flow ability with high resistance to peel back.
  • 3. Increased transverse strength due to improved cure through.
  • 4. Increased build up with improved cure through.
  • 5. Improved cure depth and uniformity of cure at identical pattern temperature and cycle times offers potential for reducing cycle time.
  • 6. Low dilation of moulds and cores.
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