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Bisphenol A Content
Wednesday, June 2nd, 2010
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BisGMA, bisphenol A-glycidyl methacrylate is a common resin that carries trace amounts of BPA. Bisphenol A (BPA) carries with it various risks recognized by the National Toxicology Program.
It is possible that high doses of bisphenol A during pregnancy and/or lactation can reduce survival, birth weight, and growth of offspring early in life. BPA has also been shown to have estrogenic effects. *
According to internal analysis, Esstech’s bisGMA, Product Code X-950-0000, has one of the lowest BPA concentrations in the industry.
EASE OF FORMULATION
To simplify formulations, X-950-0000 is available in pre-mixed solutions with Triethyleneglycol Dimethacrylate (TEGDMA).
BPA-FREE ALTERNATIVES
Esstech is constantly striving to provide customers with the most up-to-date and novel materials. The f0llowing are resin “alternatives” that do not contain BPA.
X-850-0000, Urethane Dimethacrylate
- Cures to create a hard glassy surface
- Low color values
- Excellent compatibility with light cure systems
- Increased flexibility
- Enhanced fracture toughness
Esstech is constantly striving to provide customers with the most up-to-date and novel materials. Contact us if you would like to discuss a certain material or to hear what we have in development.
* NTP-CERHR Monograph on the Potential Human Reproductive and Developmental Effects of Bisphenol A. National Toxicology Program, U.S. Department of Health and Human Services. NIH Publication No. 08-5994, September 2008.
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Refractive Index of Methacrylate Monomers & Polymers
Thursday, March 11th, 2010
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TECHNICAL BULLETIN: Refractive Index of Monomers and Their Respective Polymers
The refractive index (RI) of photopolymers is an essential property for many applications. For optical and coating applications, the RI can be related to the resultant gloss or clarity upon cure. Within the dental industry, the refractive index of the organic polymer matrix, must match that of the inorganic filler and substrate in order to avoid obvious “lines” where the product is applied.
Various factors affect refractive index values. The presence of conjugated ring structures contributes to increasing RI. In general, larger molecular weight monomers have a tendency to possess a higher RI in comparison to their lower molecular weight counterparts. Similar to this trend, high molecular weight functional groups like methacrylates have higher RI than their acrylate counterparts. Higher atomic weight atoms also seem to be predisposed to having higher RI.
Recognizing the importance of refractive index to our customers, Esstech has assembled RI data for a portion of our existing monomer products as well as their corresponding homopolymers.
Maintaining its position as an industry innovator, Esstech has also created functional, high refractive index materials. Contact us to learn more about these novel materials and how Esstech can make a material to match your application.
(P) 800-245-3800 / (P) 610-521-3800 / techsupport@esstechinc.com / www.esstechinc.com
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