Which insulation type is described as inner foam, outer solid?

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Multiple Choice

Which insulation type is described as inner foam, outer solid?

Insulation types in cables are described by how the dielectric material is arranged. Foam skin refers to a design with an inner foam insulation and a solid outer layer. The foam core provides low dielectric constant, keeping the cable light and allowing flexible performance, while the solid outer layer gives mechanical protection, moisture resistance, and durability. That combination exactly matches “inner foam, outer solid.” The other options don’t fit because all-foam would have foam throughout without a distinct outer solid layer, PVC is typically a solid jacket rather than insulation, and pulp refers to paper-based insulation rather than a foam core with a solid skin.

Insulation types in cables are described by how the dielectric material is arranged. Foam skin refers to a design with an inner foam insulation and a solid outer layer. The foam core provides low dielectric constant, keeping the cable light and allowing flexible performance, while the solid outer layer gives mechanical protection, moisture resistance, and durability. That combination exactly matches “inner foam, outer solid.” The other options don’t fit because all-foam would have foam throughout without a distinct outer solid layer, PVC is typically a solid jacket rather than insulation, and pulp refers to paper-based insulation rather than a foam core with a solid skin.

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