The material in our Pressure ProTM and Blast ProTM products is a specially woven Auxetic fabric. It is extremely cut resistant because as it is stretched, it actually gets thicker in the impacted area. The products absorb energy by stretching up to 40% before failure. This is the same way that plastic barrels with water in them stop a high speed vehicle without injuring passengers.
This depends on how many layers of Auxetic material are needed for the particular projectile. The most common application is 4 layers and it weighs about three quarters of a pound per square foot.
There is a steel cable or high strength synthetic rope incorporated in the perimeter of the products depending on the application. There are access points each foot of the perimeter which can be attached to a structure, or a blanket can be attached back to itself to form a self-contained enclosure.
Typically they are manufactured in dimensions of 25 feet and under but can be made in larger sizes. Our patented closure design allows the blankets or curtains to be connected to one another and ensures the connection points are as impenetrable as the product itself. This modular design makes it possible to create an enclosure system of virtually any size. This also allows our systems to be reconfigured for different applications since all sides can be connected using the Torque LockTM closure system.
Yes, they have been tested and are currently being utilized in several applications to arrest fluid ejection at very high pressures.
The Auxetic materials are not fire proof but the outer cover can be made from fire resistant materials and the core can be insulated to provide some duration of fire resistance. We have other products for applications that are fire resistant including a product that is made of specially woven wire mesh.
Pressure alone is not the determining factor for product capability. Additional layers can be provided for almost any reasonable pressure. The determining factor is the amount of energy in the ejected projectile and the size of the impact area on our system. We have conducted extensive testing and have engineering practices to determine the energy in a projectile and ensure the proper design of the product for the application at hand. A four layer system will handle most projectiles generated by 15,000 psi hydraulic pressure and many smaller projectiles at up to 25,000 psi.
For hydraulic applications volume is not typically a factor unless the volume is very large at a high pressure which is uncommon. For Pneumatic applications volume is a significant factor because in the event of a failure, a pressure wave can precede the projectile and may pre stress the blanket, lowering its capability to contain the projectile. Because a pressure wave impacts a large area of the blanket, its energy absorbing capability can be decreased. A pressure wave can be a greater stress on the system than the projectile itself. Our engineering practices and resources allow us to effectively design for large volume pneumatic applications.
This depends on the use and care of the system. The cover is not an essential part of the projectile arresting capability. In general, if the cover is in good shape the system is fit for use. The inspection criteria for our products are the same used for a nylon sling for lifting purposes. The industry standard for load carrying and impact resistant equipment the maximum recommended life is 10 years.
Unlike Kevlar, water does not affect the strength of our systems, nor do most common chemicals. The outer cover has a polyurethane inner coating and is very water resistant which limits the inner components’ exposure to contamination. If the system were to become saturated by submersion or extensive exposure to water, it should be dried out by hanging to prevent excess weight and the smell of a wet towel.
This depends on the total energy of the projectile and the use of the system dictated by the specific application. Our systems do not actually require the use of a structure. Blankets can be draped over or wrapped around the component being tested and connected back to themselves. For applications that require a curtain configuration, many times the curtains can be affixed to existing structure. In applications where a fairly large curtain system is being used to mitigate a small projectile, the weight of the curtain will absorb the energy. It simply needs is to be hung in place and we can provide modular, light weight truss systems for such applications. For high energy projectiles, we can engineer and design a structure according to the maximum loads at the anchor points.
The safety zone around a curtain system is one half of the distance between the closest two anchor points to the impact area. If a blanket is being used as a self-contained enclosure, allowances have to be made for the distance the blanket will move before it is constrained by the item being tested. Once an application is engineered we can prescribe a safety zone based on the final configuration.
If the cover is not damaged, the product is not damaged. The cover is much less cut resistant and will rip before the Auxetic materials are significantly stressed. If the cover is damaged by the failure Blast Control should be contacted to inspect the system for internal damage and repair the cover as needed. During product testing, the pressures were raised in subsequent tests and many of the blankets were impacted numerous times before we achieved a pressure sufficient to damage the Auxetic material.
Our Torque LockTM System requires no tools. Torque Pins are used to twist the cables together and are held in place by a Torque Panel. It is easier than setting up your average camping tent.
Our blankets have been tested with four projectiles ranging in size from one half inch diameter up to six inch diameter and at pressures up to 16,500 psi without failure. All projectile sizes were tested to failure and the results of these tests along with published studies were used to verify our engineering practices used to specify blankets. They’ve also successfully mitigated shrapnel from IEDs detonated at close range. Our sleeves have been successfully tested against numerous high pressure fluid disbursement and water jet scenarios.