Rhoplex AC-33

Description

[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion. Rhoplex AC-33 is composed of a mixture of methyl methacrylate, ethylacrylate, and ethyl methacrylate polymers. The emulsion has 46.5 % solids with a pH of 9.4-9.7. Rhoplex AC-33 dries to form a water resistant film that can be heat activated. It has been used as a base material for acrylic gels and polymer paints. Production of AC-33 has been discontinued and Rhoplex B-60-A has been suggested as a replacement.

Synonyms and Related Terms

Rhoplex AC-33 (sp); Rhoplex AC33 (sp); Primal AC-33 (Europe)

Risks

• Solutions may contain trace amounts of ammonia or formaldehyde

Physical and Chemical Properties

• 46.5 % solids: pH = 9.4-9.7
• Film (unaged): extract pH = neutral
• Film (light aged to simulate 3 yrs): extract pH = 3.7 (Down et al. 1996)

Resources and Citations

• Jane Down, Maureen MacDonald, Jean Te'treault, Scott Williams, Adhesive testing at the Canadian Conservation Institute-An evaluation of selected poly(vinyl acetate) and acrylic adhesives., Studies in Conservation, 41, 19-44, 1996

• Conservation Resources: Link (Accessed Aug 6, 2007)

• Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989

• Marie Svoboda, Conservation Survey Index, unpublished, 1997

• Conservation Support Systems, Catalog, 1997