303 SPECIAL RATIO MINI PUMPS WEST SYSTEM
WEST SYSTEM 301 Mini Pumps and 303 Special Ratio Mini Pumps are designed for convenient and accurate metering of resin and hardeners. For convenience, the pumps mount directly onto the resin and hardener containers, and eliminate the mess involved with measuring by weight or volume.
303 Special Ratio Mini Pumps are specially designed for convenient and accurate dispensing of mixtures of WEST SYSTEM 105 Epoxy Resin and 207 Special Clear Hardener or 209 Extra Slow Hardener. 303 Special Ratio Mini Pumps are calibrated to deliver the working ratio of 3 parts of 105 resin to 1 part of either 207 Special Coating or 209 Super Slow hardeners, with one full pump stroke of resin for each one ful pump stroke of hardener
Warning: do not use 303 Special Ratio Mini Pumps with 205 Fast Hardener or 206 Slow Hardener.
If you are using 105 Epoxy Resin with 207 Special Coating Hardener or 209 Extra Slow Hardener:
- use the 303A set (3:1 by volume) to fit the A Pack size
- use the 303B set (3:1 by volume) to fit the B Pack size
- use the 303C set (3:1 by volume) to fit the C Pack size
Prior to installation, insert the extension into the 4.8 litre and 24 litre pack RESIN pump. Remove the container lid and replace with the pump: smaller pump to hardener – larger pump to resin. Dispense the correct proportions of resin and hardener into a clean plastic, metal or wax-free paper container. Do not use glass or foam containers because of the potential hazard from exothermic heat build-up, and DO NOT attempt to adjust the cure time by altering the mix ratio. An accurate ratio is essential for a proper cure and full development of physical properties.
When metering resin and hardener, depress each pump head fully and continuously to the bottom of its stroke. Allow the pump heads to return completely, and unassisted, to the top of the stroke. DO NOT PULL IT. Partial pump strokes will give the wrong ratio. Do not attempt to adjust the cure rate by altering the ratio.