Page/Link: Page URL: HTML link: The Free Library. Retrieved Feb 14 2018 from. INTRODUCTION Environmental stress crack resistance (ESCR) is an important long term property of many plastics in contact with different media such as detergents, oils, and insect repellent. Laboratory measurement of ESCR is usually carried out in such media to accelerate crack initiation and propagation. In the case of polyethylene, it is well known that the cracking phenomenon is easily accelerated in the presence of detergents such as IGEPAL[R] (CO-630, Rhone-Poulenc, NJ). ESCR is relevant for rigid packaging and pipe applications. It is a relatively quick test to estimate integrity of the fabricated article, and it is resistant to stress crack failure when exposed to the material to be packaged or transported. Microsys A1 Website Download V2 0 2 Multilingual Winall Cracked there.

The environmental stress crack resistance of semi-crystalline polymers such as polyethylene (PE) is less severe than in amorphous polymers (1). However, exposing PE to stress-crack agents results in unexpected brittle fracture (2-4). Crazes (or white spots) are commonly found as a precursor to this type of fracture in PE. However, this cannot be determined by conventional mechanical properties of the polymer but rather by the ESCR tests. Recently, the practical relationship between ESCR and some physical properties, such as the strain hardening modulus (5), and creep deceleration factor (6) was proposed for the qualitative evaluation of ESCR properties of polymers. Other factors governing ESCR are those related to the environment such as the exposure time to the stress cracking agent, exposure temperature, concentration of the stress cracking agent, and level of strain on or in the polymer (7). Template Joomla 2.5 For University. Measurement of ESCR is a popular way to characterize mechanical strength of plastics. Mestrenova Serial Mackerel.