Download - Paraloid B-72 Power Point
Paraloid B-72
David Minatra
Name Variations
Acryloid B-72Until 1997
Paraloid B-72
Chemical Components
Copolymer•Ethyl Methacrylate•Methyl Methacrylate
Polymerization
Basic Info• Originally
produced by the Rohm & Haas company in 1950.
• Rohm & Haas was bought out by DOW in September of 2009.
Chemical InfoEthyl Methacrylate
• Molecular Formula C6H10O2
• Molecular Weight 114.14
• Boiling Point 117 C
• Melting Point -75 C
• Density 0.9135
Methyl Methacrylate• Molecular Formula
C5H8O2 CH2:C(CH3)COOCH3
• Molecular Weight 100.12
• Boiling Point 100C (212F)
• Melting Point -48C (-54F)
• Density 0.944
Paraloid B-72• Weight Average Molecular Weight
65,128 Mw the most relevant average molecular weight is the total weight of polymer
divided by the number of polymer molecules• Number Average Molecular Weight
11,397 Mn replace the appearance of the number of polymers of molecular weight i or
Ni in the number average molecular weight formula with the weight of polymer having molecular weight i or NiMi
MN is the average Mi weighted according to number fractions and that MW is the average Mi weighted according to weight
fractions• Glass Transition Temperature (Tg)
40°C (104°F)• Density
.66g/cm^3• Ignition Temperature
393C• Not Really Applicable
Boiling Point Melting Point
Industrial Uses• Medium for flexible ink and aerosol
sprays• General purpose clear and pigmented
coatings for masonry and cloth• Finishing metal furniture and cabinets• Phosphorescent and luminescent
pigments.
Conservational Uses• Consolidant for paint both locally and
for overall impregnation of oil paintings and wall paintings
• Inpainting medium• Consolidant for wood, plaster, stone,
and ethnographic objects• Adhesive for ceramics and glass• Fixative for pencil, charcoal, and
chalk drawings and pastels
Fossil Preservation
References• Davidson, Amy; Alderson, Samantha; An Introduction to Solution
and Reaction Adhesives for Fossil Preparation; Methods In Fossil Preparation: Proceedings of the First Annual Fossil Preparation and Collections Symposium; pp 53-62; United States; 2009.
• Davidson, Amy; Alderson, Samantha; Assembling an Archival Marketing Kit for Paleontological Specimens; Journal of Vertebrate Paleontology; September 2006, 54A.
• Davidson, Amy; Removing Fossil Ribs: The Thread Technique; Journal of Vertebrate Paleontology; September 2008; 69A.
• Edenbaum, Jesse; Plastics Additives and Modifiers Handbook; Van Nostrand Reinhold: New York; 1992.
• Horie, Velson; Adhesives for Natural Science Specimens; Natural Science Collections Association News; 2009; issue 16.
• Koob, Stephen P.; The Use of Paraloid B-72 as an Adhesive: Its Application for Archaeological Ceramics and Other Materials; Studies in Conservation, Vol. 31, No. 1. (Feb., 1986), pp. 7-14.