Anaerobic Adhesive for Sealing Bullets
METHODS OF BULLET SEALING, PRIMER SEALING AND CRIMP SEALING
Bullets (or munitions) comprise several components including the actual bullet, casing, primer or pin and of course the explosive gun powder housed inside. Traditional methods of bullet sealing include use of a bitumous compound or lacquer. These are a fairly low-cost method of bullet sealing but are fairly messy, unpleasant to handle, are difficult to use on a high speed production line due to the cure time and have a limited shelf life once on the bullet (they can be prone to degrading, cracking off or allowing moisture ingress into the gunpowder).
Low viscosity anaerobic adhesives can be used as an alternative sealing method allowing easier application, faster processing times plus most importantly increasing the life and durability of the bullet. Dual cure anaerobic-UV adhesives can further extend this by creating an instant, impervious “fillet” or meniscus around the joint which is cured in seconds with UV light. Generally these are designed to fluoresce under UV black light for inspection purposes. Anaerobic sealants are ideal for fully automated production lines – they can be dispensed via automatic metered dosage to the bullet – normally in the horizontal position as they come rolling along the production line. The anaerobic sealant “wicks” into the gap between the bullet and the casing and reacts with the metal surface to cure.
ANAEROBIC SEALANT BENEFITS OVER LACQUER
- Solvent free – no emissions or waste, non-flammable, 100% reactive
- Single component – no mixing or pot-life
- Controlled viscosity which can be matched to application
- No creep, shrinkage or cracking
- Excellent protection against moisture ingress
ANAEROBIC SEALANT BENEFITS OVER BITUMEN-BASED SEALANTS
- No heat-cure required
- No drying out or cracking
- Low viscosity for easy in-line dispensing
- Rapid cure
- Built in UV fluorescence enables easy inspection
Adhesives can also be used for sealing the primer (at the back of the bullet) or for sealing the crimp on the tips of blank bullets. Material for this application has to be fully “friable” and pass NATO tests to ensure no adhesive particles can cause injury when blank bullets are fired.