Wedge rubber

FIGURE 34.S Elongation to break of wedge rubber versus weeks in Phoenix for SUV/Minivan-A tire. 

Based on the above arguments, with peel strength measurements for the three SUV/Minivan tires. We will also include the elongation to break data for the Large Car-C tire even though the difference in wedge rubber modulus between the held and oven sets makes the comparison between these data sets somewhat questionable. 

FIGURE 34.22 Log (strain ratio) versus log (modulus) for field and oven-aged SUV/Minivan-A tires. Both sets are linear indicating oxidative aging, but the slopes are different indicating a change in composition of the wedge rubber. 

The apparatus to use is seen in figure 13 which consists of a burette, thermometer, Erlenmeyer flask and a two-holed rubber stopper that has a small V-shaped wedge cut out of one side of the rubber stopper to allow the inside contents to vent. 31.5g of orangy-red fuming nitric acid (see chemicals section) is poured into the Erlenmeyer flask and the rubber stopper with its burette and thermometer is placed on to the... 

Rubber policemen are simply rubber sleeves (obtained from Mac-Farlane Robson Ltd Appendix 3), which fit over the ends of glass rods and provide a Soft surface with which cells may be scraped from their substratum. Alternatives for use with dishes are wedges of silicone rubber cut from bungs and stuck on hypodermic needles (Fig. 4.1). These also have the advantage that they can be readily sterilised by autoclaving. A collapsible type of windscreen wiper (Fig. 4.1) is readily constructed for scraping cells from the inside of roller bottles. Scrapers can be obtained from Costar (Appendix 3). 

The identification of gases obtained in the reactions for anions may be conducted in an Erlenmeyer (or conical) flask of 5 or 10 ml capacity it is provided with a rubber stopper which carries at its lower end a wedge point pin, made preferably of nickel or monel metal (Fig. 11.43). A small strip of impregnated test paper is placed on the loop of the pin. The stoppered flask, containing the reaction mixture and test paper, is placed on a water bath for five minutes. An... 

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