When considering rubber tyre manufacturing from an occupational health viewpoint, three areas may be identified in which exposure to respirable materials are potentially harmful: the processing, curing, and talc areas. A study of the ventilatory function of the entire work force employed in the processing area in a rubber tyre manufacturing plant was undertaken to determine whether an acute red...

OBJECTIVES The aim of this in vitro study was to evaluate the influence of different light curing units and modes on microleakage of flowable composite resins. METHODS Eighty Class V cavities were prepared in buccal and lingual surfaces of 40 extracted human premolars with cervical wall located in dentin and the occlusal wall in enamel. These teeth were randomly assigned into two groups (n=20...

Immiscible blends of elastomers present high technological interest, and the selection vulcanization system is important for optimization properties different technical applications. In particular, effect curing agents on distribution cross-links in each phase key full comprehension structure–property relationships. Aiming at understanding phase-specific network structure rubber blends, this wo...

The present research aims at evaluating the mechanical performance of untreated and treated crumb rubber concrete (CRC). study was also conducted to reduce loss in properties CRC. In this study, sand replaced with (CR) 0%, 5%, 10%, 15%, 20% by volume. CR NaOH, lime, common detergent for 24 h. Furthermore, water treatment carried out. All these treatments were done enhance that are affected addi...

Approximately 246 million waste tires are generated annually in the United States. That is roughly three per four individuals country. Most end up landfills, adversely affecting environment. In last two decades, researchers have explored using tire chips concrete to replace a portion of coarse aggregates. Past studies indicated that 50% aggregates can be replaced with chips. This research propo...

Occupational nitrosamine exposures from a rubber vehicle seal (VS) curing operation were compared with the peripheral blood lymphocyte concentrations of two nitrosamine-related DNA adducts, N(7)-methylguanine (N(7)mdG) and O(6)-methylguanine (O(6)mdG), and with the activity of the enzyme that repairs O(6)mdG adducts, O(6)-alkylguanine-DNA alkyltransferase (AGT). The occupational personal breath...

Abstract The aim of this research is to measure the dielectric properties and electromagnetic interference (EMI) shielding effectiveness (SE) silicone rubber reinforced with graphene nanoplates. In a two-roll mill, different amounts are mixed together. This followed by compression moulding at 170°C post-curing for 4 h 200°C. Between 1 MHz GHz, waveguide transmission line method vector network a...

coeffcient of  friction  (cof)  for  rubber parts  is one of  the key parameters in their interaction with solid rough surfaces (micrometer to millimeter scales),  such  as  tire-road  interactions. cof  of  rubber  depends  on  viscoelastic properties of rubber, roughness characteristics of the counter-part surface, and process variables such as contact nominal pressure and sliding speed. due ...