Abstract: A flame-retardant electric cable having a core comprising at least one electric conductor, an electrically insulating coating and an outermost layer made from a flame-retardant polymer composition comprising: a) polyvinylchloride (PVC) as base polymer; b) 25-45% (70-110 phr) by weight of at least one metal hydroxide; c) 0.4-3% (about 1-8 phr) by weight of an optionally surface-treated montmorillonite having average particle dimensions of from 5 to 20 ?m; d) 1.2-3% (about 3-8 phr) by weight of antimony trioxide; wherein the sum of the amount of montmorillonite and antimony trioxide is at least 5.5 phr and wherein the antimony trioxide and montmorillonite are in a ratio of from 1:0.1 to 1:2.5.

Abstract: A flame-retardant cable includes at least one core comprising a conductor and at least one protecting layer surrounding the core. The protecting layer is made from a low smoke zero halogen (LSOH) flame-retardant polymer composition comprising at least 70 phr of a polyethylene homopolymer or copolymer having a density lower than 0.90 g/cm3 as a halogen-free polymeric base, and: a) 100 to 800 phr of at least one metal hydroxide; and b) at least 10 phr of a tannin.

Abstract: The invention relates to a flame-retardant cable having improved reaction to fire performances, in particular a reduced or null dripping under fire. The cable has a transmissive core and an outermost layer made from a flame-retardant polymer composition comprising: a) 100 phr of polyvinylchloride (PVC) as base polymer; b) 65-90 phr of a metal hydroxide; c) 2-9 phr of antimony trioxide; d) 1-3 phr of an optionally surface-modified sepiolite, and e) 3-10 phr of a Ca/Zn stabilizer.

Abstract: A flame-retardant electric cable having a core comprising at least one electric conductor, an electrically insulating coating and an outermost layer made from a flame-retardant polymer composition comprising: a) polyvinylchloride (PVC) as base polymer; b) 25-45% (70-110 phr) by weight of at least one metal hydroxide; c) 0.4-3% (about 1-8 phr) by weight of an optionally surface-treated montmorillonite having average particle dimensions of from 5 to 20 ?m; d) 1.2-3% (about 3-8 phr) by weight of antimony trioxide; wherein the sum of the amount of montmorillonite and antimony trioxide is at least 5.5 phr and wherein the antimony trioxide and montmorillonite are in a ratio of from 1:0.1 to 1:2.5.

Abstract: A flame-retardant electric cable has a core including at least one electric conductor, an electrically insulating coating and an outermost layer made from a substantially thermoplastic, low smoke zero halogen flame-retardant polymer composition. The composition includes a polymeric base made of at least one polyethylene homopolymer or copolymer having a density of 0.94 g/cm3 at most. The composition further includes 60-64% by weight of a metal hydroxide, at least 2% by weight of an ammonium coated montmorillonite having average particle dimensions of from 5 to 20 ?m, and a polysiloxane.

Abstract: A flame-retardant electric cable has a core including an electric conductor and an electrically insulating layer. The electrically insulating layer includes a flame-retardant polyolefin-based composition which includes, as base polymer, a mixture of at least two polyolefin homopolymers and/or copolymer wherein at least one is a low-density polyethylene copolymer having a density lower than 0.915 g/cm3. The flame-retardant polyolefin-based composition also includes calcinated kaolin in an amount greater than 3 phr, a metal hydroxide in an amount greater than 10 phr, and an alkyl or alkenyl alkoxy siloxane. The alkyl or alkenyl alkoxy siloxane is in an amount ratio of from 1:25 to 1:50 with respect to the sum of the amounts of calcinated kaolin and of the metal hydroxide.

Abstract: A flame-retardant electric cable has a core including at least one electric conductor, an electrically insulating coating and an outermost layer made from a substantially thermoplastic, low smoke zero halogen flame-retardant polymer composition. The composition includes a polymeric base made of at least one polyethylene homopolymer or copolymer having a density of 0.94 g/cm3 at most. The composition further includes 60-64% by weight of a metal hydroxide, at least 2% by weight of an ammonium coated montmorillonite having average particle dimensions of from 5 to 20 ?m, and a polysiloxane. The cable has improved reaction to fire performances, especially reduced dripping or absence of dripping during burning, which render it compliant with the requirements of the more recent international standards.

Abstract: A flame-retardant electric cable has a core including an electric conductor and an electrically insulating layer. The electrically insulating layer includes a flame-retardant polyolefin-based composition which includes, as base polymer, a mixture of at least two polyolefin homopolymers and/or copolymer wherein at least one is a low-density polyethylene copolymer having a density lower than 0.915 g/cm3. The flame-retardant polyolefin-based composition also includes calcinated kaolin in an amount greater than 3 phr, a metal hydroxide in an amount greater than 10 phr, and an alkyl or alkenyl alkoxy siloxane. The alkyl or alkenyl alkoxy siloxane is in an amount ratio of from 1:25 to 1:50 with respect to the sum of the amounts of calcinated kaolin and of the metal hydroxide.

Abstract: A process for recovering wastes of a polymeric composition including at least one peroxide-curable polymer and at least one peroxidic crosslinking agent, which includes compounding the wastes with at least one antioxidant agent suitable for sulfur-vulcanized elastomeric compositions, at a temperature lower than the decomposition temperature of the at least one peroxide crosslinking agent. The compounding of the polymeric wastes with the antioxidant agent is carried out at a temperature lower than the decomposition temperature of the peroxide crosslinking agent, so as to avoid any premature activation of the crosslinking agent. The process is particularly suitable for compositions based on elastomeric polyolefins, more preferably for elastomeric ethylene copolymers such as ethylene-propylene copolymers (EPR) and ethylene-propylene-diene terpolymers (EPDM), which can be processed at relatively low temperatures, much lower than the decomposition temperatures of the most common peroxide crosslinking agents.

Abstract: A process for recovering wastes of a polymeric composition including at least one peroxide-curable polymer and at least one peroxidic crosslinking agent, which includes compounding the wastes with at least one antioxidant agent suitable for sulfur-vulcanized elastomeric compositions, at a temperature lower than the decomposition temperature of the at least one peroxide crosslinking agent. These antioxidant agents are effective to quench the peroxide crosslinking agent, so as to avoid any substantial crosslinking of the composition during processing of the same. The compounding of the polymeric wastes with the antioxidant agent is carried out at a temperature lower than the decomposition temperature of the peroxide crosslinking agent, so as to avoid any premature activation of the crosslinking agent.

Abstract: A power transmission cable includes at least one power conductor, an insulating layer surrounding the conductor to form at least one insulated conductor, a flame-retardant halogen free protective sheath provided in a radially external position with respect to the insulated conductor, wherein the sheath has an inner and an outer layer in contact with each other, the inner layer having a thickness at least equal to a thickness of the outer layer, the inner layer including a polymer material having a glass transition temperature equal to or lower than ?30° C., and the outer layer including a mud resistant polymer material.

Abstract: An electric article, particularly an electric cable or an accessory thereof, such as a cable joint or a cable termination, includes at least one element made from a semiconductive polymeric material, wherein the at least one element is obtained by crosslinking a semiconductive polymeric composition including: (a) at least one elastomeric polymer; (b) a filler mixture including: (i) at least one first carbon black having a dibutyl phthalate (DBP) absorption number of from 250 to 600 ml/100 g; (ii) at least one second carbon black, different from the first one, having a dibutyl phthalate (DBP) absorption number of from 80 to 250 ml/100 g; and (c) at least one graphite having a specific surface area, measured according to the BET method, not higher than 20 m2/g.

Abstract: A cable having a conductor and a flame-retardant coating having (a) a polymer matrix; and (b) natural magnesium hydroxide particles having an average size (d50) of 0.5 ?m to 5.0 ?m and an average pore diameter less than or equal to 0.35 ?m.

Abstract: An electric article, particularly an electric cable or an accessory thereof, such as a cable joint or a cable termination, includes at least one element made from a semiconductive polymeric material, wherein the at least one element is obtained by crosslinking a semiconductive polymeric composition including: (a) at least one elastomeric polymer; (b) a filler mixture including: (i) at least one first carbon black having a dibutyl phthalate (DBP) absorption number of from 250 to 600 ml/100 g; (ii) at least one second carbon black, different from the first one, having a dibutyl phthalate (DBP) absorption number of from 80 to 250 ml/100 g; and (c) at least one graphite having a specific surface area, measured according to the BET method, not higher than 20 m2/g.

Abstract: A power transmission cable comprising at least one power conductor, an insulating layer surrounding said conductor to form at least one insulated conductor, a flame-retardant halogen free protective sheath provided in a radially external position with respect to said insulated conductor, wherein said sheath has an inner and an outer layer in contact one another, said inner layer has a thickness at least equal to a thickness of said outer layer, the inner layer comprises a polymer material having a glass transition temperature equal to or lower than ?30° C., and the outer layer comprises a mud resistant polymer material.

Abstract: Cables, in particular for low-voltage electrical energy distribution or for telecommunications, have low-smoke self-extinguishing properties, and flame-retardant compositions used therein.

Abstract: A cable for applications which entails heavy mechanical stresses and/or harsh environmental conditions includes at least one core having at least one transmissive element and an outer sheath disposed in radially external position with respect to the core. The outer sheath includes a reinforcing layer including a fibril reinforced polymeric matrix. A process for manufacturing such a cable includes the steps of providing a core having at least a transmissive element; providing a first compound of fibrils and a matrix; and applying the first compound around the core to form the reinforcing layer including the fibril reinforced polymeric matrix. The invention also deals with the use of fibrils for the manufacturing of a coating layer for a cable.