Flame arrestors for selectively securing to a smoke grenade having a smoke outlet. The flame arrestors include a base, a first screen, and a second screen. In some examples, the flame arrestor includes a thermal insulator. In some examples, the flame arrestor includes a special effects component.

Described are flame retardant, porous plastic flame arrestors. The flame retardant, porous plastic flame arrestor is formed by irradiating a flame retardant polymer resin to achieve a fractional melt index, grinding the flame retardant polymer resin into a powder, and sintering the flame retardant polymer resin to form a porous structure. Irradiating the flame retardant polymer resin increases the resin's molecular weight and reduces the resin's melt index through crosslinking.

Described are flame retardant, porous plastic flame arrestors. The flame retardant, porous plastic flame arrestor is formed by irradiating a flame retardant polymer resin to achieve a fractional melt index, grinding the flame retardant polymer resin into a powder, and sintering the flame retardant polymer resin to form a porous structure. Irradiating the flame retardant polymer resin increases the resin's molecular weight and reduces the resin's melt index through crosslinking.

The invention relates to an explosion-proof arrangement (10) having an explosion-proof housing (11) which encloses a housing interior (13) and which is designed with the pressure-resistant encapsulation type of flame-proof protection. The housing interior (13) is subdivided into a first subregion (16) and a second subregion (17) by an intermediate wall (15) in such a way that the two subregions (16, 17) are explosion-proof relative to one another and consequently each subregion (16, 17) provides the pressure-resistant encapsulation type of flame-proof protection. At least one outer wall section (12a) of an outer wall (12) of the housing (11) is designed in a flame-proof and gas-permeable manner and allows gas exchange between the second subregion (17) and the surrounding area (14). A refrigeration machine (22) is arranged in the housing interior (13), wherein the evaporator (27) is located in the first subregion (16) and the condenser (24) is located in the second subregion (17). Heat from at least one electrical and/or electronic device (21) or another heat source in the first subregion (16) can therefore be dissipated into the second subregion (17) and from there to the surrounding area (14). This measure can prevent hotspots, which can ignite the explosion-hazard atmosphere in the surrounding area (14), from forming locally.

The invention relates to an explosion-proof arrangement (10) having an explosion-proof housing (11) which encloses a housing interior (13) and which is designed with the pressure-resistant encapsulation type of flame-proof protection. The housing interior (13) is subdivided into a first subregion (16) and a second subregion (17) by an intermediate wall (15) in such a way that the two subregions (16, 17) are explosion-proof relative to one another and consequently each subregion (16, 17) provides the pressure-resistant encapsulation type of flame-proof protection. At least one outer wall section (12a) of an outer wall (12) of the housing (11) is designed in a flame-proof and gas-permeable manner and allows gas exchange between the second subregion (17) and the surrounding area (14). A refrigeration machine (22) is arranged in the housing interior (13), wherein the evaporator (27) is located in the first subregion (16) and the condenser (24) is located in the second subregion (17). Heat from at least one electrical and/or electronic device (21) or another heat source in the first subregion (16) can therefore be dissipated into the second subregion (17) and from there to the surrounding area (14). This measure can prevent hotspots, which can ignite the explosion-hazard atmosphere in the surrounding area (14), from forming locally.

A pressure relief device including a gas-permeable body to which a membrane adheres that is preferably impermeable to moisture. The membrane can be a rubber membrane that is formed by applying liquid rubber to the pressure relief body and, optionally, a component which supports the liquid rubber and surrounds the pressure relief body.

A pressure relief device including a gas-permeable body to which a membrane adheres that is preferably impermeable to moisture. The membrane can be a rubber membrane that is formed by applying liquid rubber to the pressure relief body and, optionally, a component which supports the liquid rubber and surrounds the pressure relief body.

A vented module includes a housing portion having a drainage side and a drainage port within the drainage side. The module further includes a flame arrestor including a first surface having a fluid inlet, a second surface having at least one fluid outlet, a labyrinth channel extending from the fluid inlet to the fluid outlet, and at least one mesh screen disposed within the labyrinth channel. The flame arrestor is attached to the housing portion such that the drainage port is aligned with the fluid inlet.

A vented module includes a housing portion having a drainage side and a drainage port within the drainage side. The module further includes a flame arrestor including a first surface having a fluid inlet, a second surface having at least one fluid outlet, a labyrinth channel extending from the fluid inlet to the fluid outlet, and at least one mesh screen disposed within the labyrinth channel. The flame arrestor is attached to the housing portion such that the drainage port is aligned with the fluid inlet.

A pressure vessel includes a first wall defining a container and a second wall surrounding the container defining a cavity between the first wall and the second wall. The pressure vessel also includes a vent in the second wall providing fluid communication between the cavity and an outside of the second wall and matter positioned within the cavity configured to prevent flame from propagating through the cavity while providing thermal conductivity between the first wall and the second wall.