Precision dispensing barrels and or syringes are available in 3, 5, 10, 30 and 55cc sizes. For general dispensing polypropylene barrels are clear so that the fluid may be seen. Semi transparent, tan colored barrels are suitable for some types of UV cure resins and black opaque barrels are suitable for all UV cure resins.
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Pistons serve two purposes, they spread pressure evenly across the fluid and trap the fluid in the syringe. They also prevent tunneling in higher viscosity fluids. Pistons should not be used with Cyanoacrylates due to potential stalling caused by blooming of the material.
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