20SICVN Tychem® SL Hood
Construction
The Bullard 20SICVN hood, and related models, are constructed of Tychem SL. Tychem SL has been tested against numerous chemical warfare agents and found to be effective for limited use. See the below information from Dupont’s 2003 Permeation Guide.
Protocol DN3 - MIL-STD-282, Method T-209 (HD) or modified for Lewisite, for 12 hours at 10 g/m2.
Protocol DN4 - MIL-STD-282, Method T-209 (HD) or modified for Lewisite, for 12 hours at 100 g/m2 (total coverage).
Protocol DN5 - MIL-STD-282, Method T-208 (GB) or modified for GA, GD, and VX, for 12 hours at 10 g/m2.
Protocol DN6 - MIL-STD-282, Method T-208 (GB) or modified for GA, GD, and VX, for 12 hours at 100 g/m2 (total coverage).
All seams are taped and sealed to provide additional protection for liquid penetration encountered during patient decontamination.
The lens material is constructed of press polished vinyl, which is the same material that has been used in the Level A and Level B suits from many manufacturers, as well as butyl rubber hoods.
Unique Air Delivery System
A patented neck cuff design helps maintain positive pressure inside the hood to aid in keeping contaminants out. As air enters the hood, the inner collar inflates, providing a snug, comfortable, custom fit around the neck and continuous flow of air to the worker’s breathing zone.
No Fit Testing
The hood does not require fit testing nor extensive recordkeeping as with tight-fitting full facepieces. It easily accommodates beards, prescription eyewear or safety glasses, and a wide range of facial sizes and shapes.
Disposability
Relative to the butyl rubber offerings of other manufacturers, the Bullard Tychem SL hood is economical enough to allow for disposal after each use. At the same time, the Tychem SL hood offers protection suitable for the job.
Protection
While there are no guidelines on protection from chemical warfare agents, and therefore typical protection factor information may not be looked at as definitive…users will want to know that the hood design they are using is effective and proven.
In a 1996 study of hood-style respirators coordinated by the Organization Resources Counselors (ORC), the Bullard hood was surveyed to be the number one hood used in the pharmaceutical industry. The hoods in the study were then used in a simulated workplace protection factor study (SWPF). The Bullard hood was also the top-performing loose-fitting hood among a variety of competitors. All measurements in the SWPF study were above 150,000 resulting in a study Protection Factor (APF) of 10,000! For a summary of this research, call Bullard customer service at 1-800-827-0423.