Prysmian S.p.a.

Politecnico Di Milano

Prysmian Cavi E Sistemi Energia S.r.l.

Franco Galletti

Elena Roda

Giuseppe Merigo

Gabriele Perego

Vito Scrima

Cristian Gambarotti

Armando Michele Ferrari

Eduardo Grizante Redondo

Ada Truscello

Sergio Gutierrez

Carlo Soccal

Gavin Holden

A flame-retardant cable includes at least one core having a conductor and at least one protecting layer surrounding the core. The protecting layer is made from a low smoke zero halogen (LS0H) flame-retardant polymer composition having at least 70 phr of a polyethylene homopolymer or copolymer having a density lower than 0.90 g/cmas a halogen-free polymeric base, 100 to 800 phr of at least one metal hydroxide, and at least 10 phr of a tannin.

Flame-retardant cable with self-extinguishing layer

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:

Flame-retardant electrical cable

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/cmat 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 &#x3bc;m, and a polysiloxane.

Flame- retardant electrical cable

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.

Flame retardant electrical cable

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.

Process for recovering wastes of a polymeric composition including a peroxidic crosslinking agent

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 &#x2212;30&#xb0; C., and the outer layer including a mud resistant polymer material.

Power transmission cable

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 m/g.

Electric article comprising at least one element made from a semiconductive polymeric material and semiconductive polymeric composition

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 (d) of 0.5 &#x3bc;m to 5.0 &#x3bc;m and an average pore diameter less than or equal to 0.35 &#x3bc;m.

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Milan, Italy

Franco Galletti