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West System Epoxy

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Quantity of filler required for

FILLER 'Ketchup' 'Mayonnaise' 'Peanut Butter'


consistency consistency consistency
Microfibres 403 4% 7% 16%
High density filler 404 35% 45% 60%
Filleting blend 405 15% 20% 25%
Colliodal Silica 406 3% 5% 8%
Low density filler 407 20% 30% 35-40%
Microlight 410 7% 13% 16%


Reference to epoxy or resin/hardener mix, is defined as mixed resin and hardener without fillers added; reference to thickened mix will mean resin/hardener with either high-density or low-density fillers added.

Each filler possesses a unique set of physical characteristics, but the fillers can be generally categorised as either high-density (403, 404, 405 or 406) or low-density (407 or 410).

Table 1 is a guide for selecting a filler based on the physical properties required for a particular job. Each filler is rated between 1 and 5 in each of five physical categories.

General Table 1     -     Filler
Characteristics 403 404 405 406 407 410
Strength (Strong=5) 4 5 4 4 1 1
Weight (Lightest=5) 3 1 3 3 4 5
Sanding (Easiest=5) 2 1 2 2 4 5
Texture (Smooth=5) 1 2 3 5 4 4
Mixing (Easiest=5) 5 2 4 3 2 4

Table 2 shows the most appropriate fillers for specific jobs.

Table 2 - Suitability of various fillers for specific applications

403 404 405 406 407 410
Laminating 5 2 3 4 2 0
Bonding 4 5 3 5 2 0
Fairing 0 0 0 0 4 5
Hardware Bond 3 5 3 4 0 0
Filleting 2 2 4 5 3 0
Most suitable= 5





Least suitable=0





MIXING

The viscosity of a required mix for a particular job is controlled by the amount of filler added (Figure 3) Always add fillers in a two-step process:

1. Mix the desired quantity of resin and hardener thoroughly before adding fillers. Begin with a small batch.

2. Stir in small quantities of the appropriate filler until the desired consistency is reached. Be sure all the filler is thoroughly blended before the compound is applied

ADDITIVES

Although additives are blended with the mixed epoxy in the same two-step process as fillers, they are not designed to thicken the epoxy. Additives are used in smaller quantities to give the epoxy additional physical properties when used as a coating and pigments to provide a colour base for future overcoating with good quality marine paint.

Characteristics Unthickened mixture. Slightly thickened. Moderately thickened. Maximum thickness

Drips off vertical Sags down vertical Clings to vertical surfaces Clings to vertical surfaces

surfaces surfaces. Peaks fall over Peaks stand up
CONSISTENCY 'SYRUP' 'KETCHUP' 'MAYONNAISE' 'PEANUT BUTTER'
USES Coating, wetting out Laminating/bonding General bonding, Gap filling, filleting,

before bonding, flat panels with large filleting, hardware fairing, bonding

applying fibreglass, surface area, injecting bonding. uneven surfaces.

graphite & other fabrics. with a syringe.

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