What Is Plastic Cement?

Plastic cements, also known as poly cements, are a special type of adhesive liquid that are most effective in securing plastic to plastic bonds. They work by melting the surface on contact and allowing two pieces of plastic to fuse together, creating a secure bond. While most plastic cements are used to bond two, or more, pieces of plastic, some varieties can successfully be used to secure other materials--including metal, ceramic and wood.

Composition

• According to Norman J. Hyne in the book "Dictionary of Petroleum Exploration, Drilling & Production, Volume 1990," plastic cement is a mixture of liquid resin, water, API cement classes A, B, G or H and a catalyst. API (American Petroleum Institute) 10A specifies different classes of cements, running from class A to class H. Each class has different properties and is formulated for different end-applications/conditions.

Types

• Plastic cement is available as thick liquid plastic cement, thin liquid plastic cement and rubber cement. Thick liquid cements are typically applied with needlepoint applicators while thin liquid cements are applied with thin paintbrushes.

Properties

• Plastic cement provides high resistance to heat and moisture. It can effectively be used on both wet and dry surfaces. Plastic cement typically appears as a black, thick paste denoting its petroleum base.

  The boiling point of plastic cement ranges from 310 degrees Fahrenheit to 400 degrees Fahrenheit.

Uses

• It can be used for exterior as well as interior sealing applications, and to close gaps in eaves, skylines, flashings, vents and roof.

  Plastic cement is an effective way to bond plastic PVC pipes for plumbing works. It can easily be mixed with sand to form stuccos and plasters, which can be applied as a wood sealant to prevent rot, and to attach loose pieces of furniture together.

  Plastic cement is useful for woodworking projects, and to repair holes, cracks and splits in wood. It also helps salvage metal, rubber, ceramics, glassware and plastic items. Plastic cement provides an effective and quick bond to laminates and veneers.

Hazardous Information

• Plastic cement should not be stored or mixed with liquid oxygen or chlorine. Its containers must remain tightly closed when not in use. The application of plastic cement to hot surfaces requires additional safety measures. It decomposes to carbon monoxide, carbon dioxide, smoke and fumes when it reacts with incompatible materials.