Abstract: A composition of elastomeric insulation is provided. This composition is suitable to be used as a non-asbestos insulation in a solid rocket motor. In this embodiment, an EPDM rubber, a polyaramide fiber, a liquid EPDM rubber and an aluminum hydroxide are used to substitute the hazardous asbestos in traditional insulation materials to prevent environmental contamination. With careful formulation control, density of the composition based on this embodiment can be tailored to lower than 1.0 gm/cm3. Thus enable the insulation to be especially applicable in the areas of lower ablation rate in a solid rocket motor to reduce tare weight of the rocket motor. Moreover, since no chlorinated organic fire retardant compound is used therein, the additional advantage of low smoke density and low smoke toxicity is exhibited.

Abstract: Non-asbestos elastomeric insulating materials for solid propellant rocket motors are disclosed. The insulating materials are composed of EPDM rubber, polyaramide fiber, liquid EPDM rubber, magnesium hydroxide or aluminum hydroxide, silicon dioxide, chlorinated flame retardant compound and zinc hydroxystannate. The char forming organic fiber is used to substitute asbestos in traditional insulating materials that are believed to cause serious environmental problems. These fillers in the formulation, which when combined, have a synergistic effect that reduces the ablation rate significantly. Also, use of zinc hydroxystannate to substitute Sb2O3, may further reduce density of the insulator and smoke density and smoke toxicity of exhausted gas from the rocket motor.

Abstract: A rocket motor insulation is formed of a solid EPDM rubber, a liquid EPDM rubber, an inorganic hydrophilic filler, and polyaramide fiber in place of asbestos of the conventional insulation. The hydrophilic filler takes the form of powder. The fine particles of the filler powder are encapsulated with a rubber material. The encapsulated particles of the filler are provided with protection against interference by moisture contents of other ingredients of a compounding recipe, relative humidity of a processing environment, and a shearing stress brought about in the course of preparation. The vulcanized end product of the insulation has an excellent physical property of ablative resistance.

Abstract: Non-asbestos elastomeric insulating materials for solid propellant rocket motors are disclosed. The insulating materials are composed of EPDM rubber, polyaramide fiber, liquid EPDM rubber, magnesium hydroxide or aluminum hydroxide, silicon dioxide, chlorinated flame retardant compound and zinc hydroxystannate. The char forming organic fiber is used to substitute asbestos in traditional insulating materials that are believed to cause serious environmental problems. These fillers in the formulation, which when combined, have a synergistic effect that reduces the ablation rate significantly. Also, use of zinc hydroxystannate to substitute Sb2O3, may further reduce density of the insulator and smoke density and smoke toxicity of exhausted gas from the rocket motor.

Abstract: A method and an apparatus are devised to install an insulation rubber loop in the aft end of a rocket motor case. The method includes the making of a rubber strip into a rubber loop by casting. The rubber loop is partially cured and is then adhered to the inner wall of the aft end of the rocket motor case by using a silicone rubber loop of the apparatus. The silicone rubber loop is caused to deform so as to press against the insulation rubber loop, which is thus securely attached to the inner wall of the aft end of the rocket motor case. The attachment of the rubber loop is further enhanced by heating the rocket motor case to provide heat which is intended to facilitate the curing of the rubber loop.

Abstract: A conveying apparatus. The apparatus includes an air-cooled hydraulic driving unit, a hydraulic motor, a conveyor and a connecting element. The air-cooled hydraulic driving unit includes a hydraulic pump, an electrical motor, pipes, a flow regulator, and a cooling fan. The cooling fan is adapted for low temperature environment and does not require complicated pipes, so that the conveying apparatus of the present invention can be flexibly combined with other devices or applied to various processes.

Abstract: The present invention discloses a conveying apparatus easy to move and disengage. Such apparatus mainly includes an air-cooled hydraulic driving unit, a hydraulic motor, a conveyor and a connecting element. The air-cooled hydraulic driving unit is composed of a hydraulic pump, an electrical motor, a plurality of pipes, a flow regulator, and a cooling fan. The cooling fan is particularly fit for low-temperature environment and doesn't require complicated pipes, so that the conveying apparatus of the present invention can be flexibly combined with other devices or applied to various processes.