Rubber cement

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Bottle of rubber cement, showing a brush built into the cap, and a photo about to be cemented to graph paper.

Rubber cement is an adhesive made from elastic polymers (typically latex) mixed in a solvent such as acetone, hexane, heptane or toluene to keep them fluid enough to be used. Water-based formulas, often stabilised by ammonia, are also available. This makes it part of the class of drying adhesives: as the solvents quickly evaporate, the "rubber" portion remains behind, forming a strong, yet flexible bond. Often a small percentage of alcohol is added to the mix. Alcohol does not pose a problem, but acetone—a solvent widely used in nail polish removers—does irreparable damage on polished surfaces and many plastics.

Formula[edit]

The formula for rubber cement varies according to its targeted application. Those commonly used in office and art applications are usually non-vulcanizing[citation needed] and seldom differ between brands. However, they have been reformulated over time due to concerns over the toxicity of the chemicals involved, especially in regard to its use by children. Consumer-grade products generally no longer contain benzene because of its link to certain cancers. Instead, they tend to be based on less toxic solvents such as n-hexane and n-heptane.

Rubber cement based on n-heptane is very popular and ubiquitous in the United States, but is generally unknown and unavailable as a consumer product in the UK and some parts of Europe. A similar solvent based product called "Cow Gum" was common in the UK, but is no longer in production. Current solvent based options include Marabu-Fixogum and Platignum "Studio Gum" which are marketed in the UK and Europe. A water-based latex adhesive available in the UK is Copydex. Marabu-Fixogum rubber cement and its thinner contain acetone as a solvent.

For tire patching, shoe repair, and other industrial applications, vulcanizing formulas are preferred[citation needed]. These contain chemical additives which enable them to cross-link and harden into a tougher, more resilient form.

Usage[edit]

Rubber cement is favored in art applications where easy and damage-free removal of adhesive is desired. For example, rubber cement is used as the marking fluid in erasable pens. The rubber cement can be removed via the eraser up to 10 hours after application.[citation needed]

Cement formulations based on n-heptane and n-hexane will not shrink or swell paper fibers, thereby preventing wrinkles to the adhered surfaces. This makes them safe to use on most finished paper surfaces, unlike water-based glues such as PVA glues (e.g., white or Elmer's brand glue).[citation needed]

Because rubber cements are designed to peel easily or rub off without damaging the paper or leaving any trace of adhesive behind, they are ideal for use in paste-up work where excess cement might need to be removed. It also does not become brittle as paste does. Rubber cement is not considered an archivally sound adhesive and will cause deterioration of photographs and papers over time.[citation needed]

History[edit]

Rubber cement was invented by Paul Van Cleef in the early 1900s to be used in various applications in the Van Cleef Brothers factory in Chicago, Illinois.

Hazards[edit]

The solvents used in rubber cement present some hazards, including flammability and potential for abuse as inhalants. Therefore, as with any adhesive, rubber cement should be used in an open area. Also, care needs be taken to avoid heat sources, as n-heptane and n-hexane are highly flammable. Rubber cement and rubber cement thinner (which is used to replace the solvent that evaporates from the container and to remove stains of glue) that contain acetone will damage polished surfaces and many plastics.[1]

References[edit]

  1. ^ Actio Software Corporation (2007). Devcon - Rubber Cement. Retrieved from http://www.devcon.com/techinfo/14900.PDF.

External links[edit]