摘要:
A composition is prepared for the manufacture of a foam material based on phenolic resin comprising components for the manufacture of a phenolic resin, acid material and carbonate containing material, in which the carbonate containing material comprises at least one element having a valency greater than one.
摘要:
The invention concerns a lining for furnaces, mills or containers, said lining comprising at least one cover layer and at least one carrier layer which are interconnected such that they adhere firmly by ceramic bonding as the result of the burning down of a reactive exothermic mortar. The invention further concerns a method of producing a lining for furnaces, mills and containers by arranging layers of this type.
摘要:
A carbohydrate is added to sand, which has been used to make foundry moulds or cores, and which has been bonded using an alkaline resol phenol-formaldehyde resin, prior to reclamation of the sand by a thermal reclamation. The thermal reclamation may be done in other equipment, for example a rotary thermal reclamation unit, but is preferably done in a fluidised bed reclamation unit. The carbohydrate is preferably water soluble and is added to the used sand as an aqueous solution. The carbohydrate may be for example a monosaccharide, such as glucose, mannose, galactose or fructose, or a disaccharide such as sucrose, maltose or lactose. The carbohydrate may also be a carbohydrate derivative such as a polyhydric alcohol (e.g. ethylene glycol, glycerol, pentaerythritol, xylitol, mannitol or sorbitol), a sugar acid (e.g. gluconic acid), or a polysaccharide derivative (e.g. a starch hydrolysate, i.e. a glucose syrup or a dextrin). The amount of carbohydrate used in the reclamation process is usually of the order of 0.25 % to 5.0 % by weight based on the weight of used sand.
摘要:
A telecommunications active electrical circuit apparatus, comprising: (a) a circuit board having active components; (b) a flexible environmental gas and liquid barrier envelope sealingly encapsulating at least part of said circuit board; and (c) an electrical connector for connecting the circuit board to an external system, whereby said connector is located outside the flexible barrier envelope and is electrically connected to the circuit board by means of one or more flexible electrical conductors extending out of the flexible envelope.
摘要:
A cable splice closure is disclosed, which comprises a casing (29) which, in use, is closed around a cable splice (21); and at least one cable gripper comprising a strip (25) which, in use, is wound around at least one cable (23) extending into the casing (29). Closing the casing (29), in use, automatically causes the or each strip (25) to tighten around the or each cable around which it is wound, thereby gripping the cable (23). The cable gripper strip (25) may have the ability to decrease in length when wound and compressed around a cable (23), thereby allowing it to contract, and therefore tighten, around the cable (23).
摘要:
An RJ type telephone connector spring block for forming an environmentally sealed RJ type telephone socket, said spring block comprising:
a spring block body; a plurality of RJ type telephone socket contacts mounted to said spring block body; a plurality of wires electrically coupled to said RJ type telephone socket contacts; and a quantity of gel encapsulating said spring block body and at least a major portion of said RJ type telephone contacts adjacent said spring block body, wherein said encapsulated spring block is operably insertable into an RJ type telephone socket housing so as to form an environmentally sealed RJ type telephone socket.
摘要:
A tracking and erosion resistant composition includes (a) 100 parts by weight of organopolysiloxane; (b) between 1 and 15 parts by weight of magnesium oxide; (c) between 15 and 45 parts by weight of zinc oxide and (d) between 5 and 40 parts by weight of iron oxide.
摘要:
A cable gripper is disclosed, which comprises two or more strips and one or more connecting members extending between and interconnecting the strips. In use, the strips are wound around a cable to grip the cable, and each strip has the ability to decrease in length when wound and compressed around a cable, thereby allowing it to contract, and therefore tighten, around the cable. There may additionally be sealing material between the strips, for example in the form of a strip.
摘要:
A cable closure, comprising: (a) at least two housing parts which, in use, are brought together, and when brought together provide a cavity for containing sealing material, through which cavity one or more cables may extend into the closure; (b) sealing material which is contained in the cavity upon bringing the housing parts together, and which seals between the cable(s) and the housing part(s); and (c) at least one resilient member which, in use, is contained in the cavity; wherein bringing the housing parts together, in use, causes the or each resilient member to be compressed, and thus causes the or each resilient member, by its resilience, to apply a compressive force to the sealing material.
摘要:
A device (1) capable of co-operating with an outer pressure member (25) to form a sealing block between two or more elongate substrates and a hollow housing within which the substrates extend, the device (1) comprising: (i) an elongate support member (2) and (ii) two or more elongate flexible leaves (3, 4) each of which comprises a sealing material that (a) is not heat fusible, (b) is secured relative to the support member (2), and (c) extends laterally of the elongate support member (2), the device (1) being positioned, in use, between the elongate substrates, so that a first of the flexible leaves extends at least part of the way around the periphery of a first of the elongate substrates, and a second of the flexible leaves extends at least part of the way around the periphery of a second of the elongate substrates, so that in co-operation with the action of the outer pressure member (25) acting inwardly on the substrates and the device (1), and outwardly onto the housing, a sealing block is made between the elongate substrates and the housing.