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Butvar B-76 B76 Resin, Eastman Chemical Polyvinyl Butyral - Conservation Resin - HARD TO FIND ऱ
Brand new but getting very hard to find. This listing is for 30g of Butvar B-76 Polyvinyl Butyral (PVB) resin. I believe this product has been discontinued. It is a favorite among conservators and rock hounds and fossil hunters. It can be used as a consolidant for fossils and other artifacts. It is also used as a varnish where it has a matte finish. This is unlike Paraloid B-72, which many have switched to since discontinuation, which produces more of a glossy finish. If you are looking for Paraloid B-72 resin though, I happen to sell that too! Back to Butvar though - two other uses (it has too many to list) are as a filler material and it can also be used as an adhesive by first dissolving a large volume in a solvent.
Butvar B-76 resin has a Molecular Weight (MW) = 90,000 - 120,000
I will eventually put up some offerings at different weights but for right now I am only selling in 30g amounts. And don't forget, if you also would like some Paraloid B-72, you can either send me a message and I can send you a link or you can search my listings. It is available in amounts from 10-100g and more by special request.
More info from manufacturer and other sources:
Butvar B-76 is a thermoplastic, polyvinyl butyral resin which offers a unique combination ofproperties for coating or adhesive applications. The use or addition of polyvinyl butyral to a systemimparts adhesion, toughness, and flexibility. PVB retains the clarity of the coating and offers reactivehydroxyl sites for crosslinking with thermoset systems. The broad solubility range of Butvar B-76allows it to be formulated into many applications including:• BINDERS FOR INKS, TONERS, AND REPROGRAPHIC COATINGS• COATINGS FOR WOOD, METAL OR PLASTIC SUBSTRATES• CERAMIC AND METAL OXIDE BINDERS
Physical PropertiesSpecificationsI Property Limits Test Method IHydroxyl Content,%11.0-13 .0Titration (Expressed as % Polyvinyl Alcohol) WS-03-76-09B ISolution Viscosity, cps18 .0-28.0Ostwald Viscometer(5% solids in ethanol@ 25 °C) WS-03-76-0 IDIv olatile Content, % 5.0 max.ThermogravimetricWS-03-76-03BUseful Information!Form White, free-flowing powder!Acetate Content, (% Polyvinyl Acetate) 1.5 maxIButyral Content, (% Polyvinyl Butyral) 88 (approximate)!Molecular Weight* (Mw) 90,000-120,000!specific Gravity 1.083!Glass Transition Temperature (Tg), °C 62-72I* Size exclusion chromatography with low angle laser light scattenng standard
Butvar® B-76 is a thermoplastic, polyvinyl butyral resin. Butvar® B-76 is supplied in coarse powder form with an unlimited shelf life, which dissolves (albeit slowly) in a solution of either acetone or ethanol (amongst others). It sets when the solvent evaporates. It is mostly used nowadays in fossil preparation as a consolidant, a semi-matt varnish, a translucent but strong filler material and less commonly as an adhesive.
Butvar B-76 as a filler material in fossil preparation: It can be combined with ground matrix to create a natural filler paste, which is rigid when set but easily dissolved or reworked.
It is often best used as a field consolidant or mid-mechanical prep consolidant as it is easier to remove than Paraloid B-72. Butvar B-76 redissolves in acetone or ethanol much more readily than Paraloid B-72 if used as only a temporary consolidant. The matrix isn't consolidated quite as firmly and adhesion with the specimen isn't as strong as with Paraloid B-72. This has it's advantages when working mid prep - the matrix can be consolidated for mechanical removal with an air scribe, but isn't too firmly set.Let me know if you have questions!
For SEO purposes (this is AI generated and may not be completely accurate, message me if you have any questions):
The product is Butvar B-76 resin, also known as Eastman Polyvinyl Butyral, with a molecular weight range of 90000-120000. Manufactured by Eastman Chemical in Germany, this type of resin is used for conservation purposes and is considered hard to find. It is ideal for collectors interested in rocks, fossils, and minerals, as well as those working in the field of tools and supplies for scientific research and preservation.
