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Gloves
Published in Robert N. Phalen, Howard I. Maibach, Protective Gloves for Occupational Use, 2023
Marie-Noëlle Crépy, Pierre Hoerner
EPDM is a synthetic rubber made from ethylene, propylene, and a diene comonomer with excellent chemical resistance to polar solvents and corrosive chemicals. Just as CSM, EPDM is a rubber with a saturated backbone, and for this reason it has much better resistance to heat, light, and ozone than unsaturated rubbers such as NR, CR, and IR. This makes it suitable to be utilized in harsh environments or for gloves that are regularly sterilized by steam.
Personal Protective Equipment (PPE): Practical and Theoretical Considerations
Published in Brian J. Lukey, James A. Romano, Salem Harry, Chemical Warfare Agents, 2019
Another factor when considering respirator selection is the material that is used to construct the facepiece. Certain materials, such as butyl rubber, especially butyl rubber that has been impregnated with the halogenated salts of chlorine or bromine, are especially resistant to permeation by the vesicant agents. Although all chemical agents or compounds (warfare and otherwise) will eventually permeate through the facepiece of respirators and other chemical-protective equipment, the real question is one of permeation time. Is this permeation time expressed in seconds, minutes, hours, days, weeks, months, years, decades, centuries, or millennia? It should be noted that generally, the permeation time of facepiece material (or any chemical-protective material) increases as the thickness of the material increases, and this increasing permeation time generally follows more of a geometric rather than an arithmetic pattern. Of all CWA classes (lung-damaging agents, cyanides, vesicants, nerve agents, incapacitating agents, and riot control agents), the vesicant group of CWAs is the quickest to permeate chemical-protective material, including facepieces. Additionally, respirators built with silicone facepieces have particularly poor resistance to permeation by vesicants (Gander, 1997) and require a second-skin vesicant permeation barrier. This second-skin barrier is often made of EPDM, although butyl rubber (particularly those impregnated with chlorine or bromine salts, i.e., halogenated) is an excellent alternative.
A method for the tribological assessment of oral pharmaceutical liquids
Published in Drug Development and Industrial Pharmacy, 2022
Hyun Joo Lee, R. Gary Hollenbeck, Jill A. Morgan, Amy Kruger Howard, Akhtar Siddiqui, Vilayat A. Sayeed, Arzu Selen, Stephen W. Hoag
Our measurements of the COF are consistent with other findings in the literature. For example, Garrec and Norton measured the COF 1 wt% guar gum solution with various salts found COF ranging from 0.5 to 1.1; for our formulation, we found the COF ranged from 0.1 to 0.6, which is slightly lower but consistent with their findings [39]. In several studies, Nguyen et al. studied the lubrication of dairy fluids using different surface types [14,29]. They studied EPDM rubber, 3M surgical tape (same as these studies) and silicone rubber, and for these surfaces when they found COF that varied from 0.2 to 1.1, from 0.1 to 0.75 and 0.4 to 0.5, respectively, for skim and full-fat milk. These findings are also consistent with our findings. Also, in studies done by Laguna et al. and Kieserling et al. our findings were consistent with their findings for a variety of foods [20,26].
Effect of cementation techniques on fracture load of monolithic zirconia crowns
Published in Biomaterial Investigations in Dentistry, 2021
Janne Angen Indergård, Anneli Skjold, Christian Schriwer, Marit Øilo
The crowns were subsequently loaded centrally at the occlusal surface with a horizontal steel cylinder of 13 mm in diameter cushioned with a 3 mm thick rubber disc of hardness 90 Shore A (EPDM 90) to avoid contact damages as previously tested (Figure 3) [20–22]. The load was applied in a servo-hydraulic testing system at a rate of 0.5 mm/min until fracture occurred (MTS 852 MiniBionix II, Minnesota, USA). The crowns were submerged in water at room temperature during loading. Load at fracture was recorded and used in the analysis.