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The material selection platform
Adhesives Ingredients
The material selection platform
Adhesives Ingredients

Epoxy-Sealant by BASF (Mercaptan Cured Epoxy)

Adhesives Formulation

Applicable Base Polymer

Applicable Base Polymer Properties

The polymercaptans can be used to cure epoxy resin systems quickly. The primary advantages of epoxy adhesives cured with mercaptan curing agents are the following:
• Rapid Cure of Epoxies
• Low-Temperature Cure
• Thin-Film Cure
• Low Toxicity
• Light Color
• Excellent Adhesion
• 1:1 mix ratio – not critical
• Acceleration ability with other curatives, e.g. amines, polyamides, anhydrides, etc.

The above formulation is a replacement for epoxy-mercaptan sealants. It provides the following advantages over the more conventional mercaptan containing formulation:
• No odor
• Longer working time
• Faster property development
• Improved water absorption

Typical Formulation Ingredients

Phase
Ingredient
Parts by weight
Epoxy resin (Epon 828, Momentive Specialty Chemicals) 
xxx 
Polymercaptan (Capcure 3-800, Gabriel Performance Products) 
xx 
Amine curing agent (Versamine EH-50, Cognis) 
xx 

Typical Properties

Properties
Gel time (20 gm), min 
xxx 
Hardness, Shore D after: 
 
• 15 min 
xx 
• 30 min 
xx 
• 40 min 
xx 
• 16 hrs 
xx 
Water absorption (24 hrs boil), % 
xxxx 

Processing

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Resulting Properties

The bond will set to a handling strength in approximately 5 mins at room temperature and will develop greater than 1,000 psi tensile shear strength in approximately several hours. Practical cure rates can be achieved at temperatures as low as 4°C. The major disadvantages of mercaptan curing agents are their odor, skinning, and low heat deflection temperature.

Tips and Tricks

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