What Is Contact Cement?
Contact cement is a powerful adhesive made of neoprene and synthetic rubber. It is highly resistant to moisture, bonds almost instantly, and requires no clamping of the bonded materials. However, it can be susceptible to deterioration, and is not as effective when a powerful bond is required for a long period of time. This adhesive is best used with plastic, rubber, glass, leather, metal and veneer.
Contact cement is available in both a flammable and non-flammable form. Both are effective adhesives, but the non-flammable version is a water-based contact cement, and will not bond for long durations. When used on substances like veneer and leather, non-flammable cement causes the material to warp and curl at the edges. Flammable cement provides a stronger bond, but also produces vapors that can explode when exposed to an open flame. In most situations, flammable cement is the preferred choice, but always consider the environment in which it will be used before applying.
Temperature and humidity are two important factors that affect the rate at which the cement solidifies. High temperatures cause the adhesive to bond more quickly, while low temperatures reduce the rate at which the liquid evaporates, resulting in slower drying. Conversely, high humidity causes contact cement to dry less quickly, while low humidity speeds up the process. When precise placement is important, slower bonding is valuable, and allows plenty of time to position the objects before the cement is fully bonded. However, high temperatures and low humidity are ideal when time is short.
Clean and dry all surfaces before applying contact cement. Any particles or residue present can cause the adhesive to adhere improperly, reducing its effectiveness. Use a brush or roller to apply the cement to most objects to avoid potential skin contact. Coat both sides of the object with cement, and press together for at least 15 minutes to allow the adhesive to harden. Stray cement can be easily removed with nail polish remover, which breaks the chemical bonds.
The longer the lid is removed from the contact cement container, the more the adhesive inside will dry. Only open the lid when necessary, or the cement may solidify and become completely unusable. Always apply contact cement in a well-ventilated area, as the fumes can be both toxic and flammable. Inhaling the fumes may cause irritation to the lungs, throat and nose. Eye protection and gloves should always be worn when handling or applying contact cement.
Written by C. Ausbrooks
