Such composite materials are called syntactic foam.

Aluminum-based syntactic foams are finding applications in the automotive sector.

Hollow spheres are used as a lightweight filler in composite materials such as syntactic foam and lightweight concrete.

A special class of closed-cell foams is known as syntactic foam, which contains hollow particles embedded in a matrix material.

The advantage of syntactic foams is that they have a very high strength-to-weight ratio, making them ideal materials for many applications, including deep-sea and space applications.

The boxes were packed with syntactic foam, a pressure-resistant resin containing tiny, air-filled glass spheres.

Without ballast attached, the sub is positively buoyant, it uses syntactic foam for buoyancy.

Structural applications include the use of syntactic foams as intermediate layer (that is, the core) of sandwich panels.

The mooring is held up in the water column with various forms of buoyancy such as glass balls and syntactic foam floats.

The Fevernova's innovation is its inner layer of syntactic foam commonly used in insulation and flotation devices.