Paraloid B-48N
Description
[Rohm & Haas] A registered trademark for a clear, colorless, thermoplastic acrylic resin. Paraloid® B-48N (formerly called Acryloid® B-48N in the United States) is a copolymer of methyl methacrylate and butyl acrylate. It contains an adhesion promoter that assists bonding to bare and primed metals. Analysis indicates that it also contains a plasticizer, dibutyl phthalate, that is sometimes concentrated in a residue on the bottom of the container. Paraloid® B-48N is used as a clear coating for metals (copper, brass, bronze, and zinc). It produces a tough, flexible coating with excellent durability. Paraloid® B-48N is supplied as solid pellets or as 45% solids solution in toluene (Paraloid® B-48S).
Synonyms and Related Terms
Acryloid B-48N; Paraloid B48N (sp); Paraloid B-48S; Acryloid B48N (sp); Acryloid B-48N (sp)
Applications
- Coating/barrier for mount making
Personal Risk
- Talas: MSDS
Environmental Risk
This material is listed in the FAIC STiCH Carbon Calculator. Visit the STiCH website for information on how to evaluate the sustainability of this material in comparison to others.
Physical and Chemical Properties
- Soluble in toluene, xylene, Cellosolve acetate, methyl ethyl ketone, and acetone.
- Adding 2% ethanol may reduce cloudiness and stringiness.
- Density = 1.15
- Molecular Weight = 250,000
- Tg = 50 C
- Refractive Index = 1.89
Working Properties
Resources and Citations
- J. Down, M.MacDonald, J.Te'treault, S.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.
- B. Rydzewski, Submissitted information, Jan. 2009
- Product Information Comment: Rohm and Haas acryloid acrylic resins sheet. 1986.
- Comment: www.rohmhaas.com
- Marie Svoboda, Conservation Survey Index, unpublished, 1997
- Cricket Harbeck, Adhesives Commonly used in Objects Conservation, unpublished, 1996
- Conservation Materials Ltd., Catalog
- Conservation Support Systems, Catalog, 1997