Polyethylene wash bottle

When you put on a nylon jacket, use a polyethylene wash bottle in the lab, wear contact lenses, or accidentally drop your telephone (and it doesn t break), you are benefiting from the properties of polymers. Polymers are very large molecules that are assembled from small units (called monomers). Because of their many useful properties, polymers are manufactured in huge quantities. In fact, it has been estimated that over 50% of all industrial chemists have jobs that are directly related to polymers. 

After the sample has drained to the top glass-wool plug in the column, rinse the wall of the column reservoir thoroughly with 8 M HNOj. This can be done conveniently with a polyethylene wash bottle. Do this at least 3 times with about 5-10 ml of 8 M HNOj and allow each rinse to drain to the top glass-wool plug. 

I) polyethylene wash bottle (m) single-pan electronic balance with automatic zeroing and digital readout, 100 g 0.001 g capacity (n) electric flask heater (o) solid-state control for electric flask heater (p) stainless steel spatula (q) Keck clamp. 

Solvent wash bottles. The Nalgene 500-ml. polyethylene wash bottles are recommended as containers for common solvents (see Fig. S-4). The name, symbol, or formula of a solvent can be written on a bottle with a Magic Marker or wax pencil. A volume up to 25 ml. per squeeze can be delivered from the spout into a graduate a larger volume can be poured out of the central opening. For crystallizations and for the quick cleaning of apparatus it is convenient to have available one bottle for each frequently used solvent.-... 

The need for high molecular weights in order to obtain useful mechanical properties is neatly illustrated by a comparison of straight-chain hydrocarbons. It is easy to appreciate the difference between a birthday candle (a mixture of C25-C50 alkanes, i.e. Mn 500), which is a brittle material and breaks easily, and a polyethylene wash bottle tip (chains of >1000 carbon atoms, i.e. Mn> 15,000), which can be repeatedly bent [39]. 

Polyethylene washing bottle, volume 500 ml, for 100 % glacial acetic acid... 

Measure in 15 ml of acetate buffer from a polyethylene wash bottle, making the total volume (as measured in the cylinder) to 45 ml (Note a). Place the cylinders in a thermostatically controlled water bath at a temperature between 23 and 26 C, held constant to 1 C or better (Note b). 

Wash oS the precipitate from the filter with short, hard spurts of filtered.sea water from the polyethylene wash bottle. The efficacy of this procedure depends much upon the size of the wash bottle orifice and this should be adjusted by trial and error so that all the precipitate is removed by 10-12 ml of water. The membrane filter should wash quite free from stain although a very slight stain left after removing a heavy precipitate can be ignored. 

Millipore filtration equipment designed to hold 47-mm diam membrane filters. One 300-ml polyethylene wash bottle. 

Storage of oil-free solvent in a polyethylene wash bottle for several days contaminates the solvent. Any solvent transferred to the wash bottle for purposes of running the test should either be used in testing during the same day or discarded. 

Note 2—A suitable sampling chamber may be devised from a polyethylene wash bottle of nominal SOO-mL (I6-oz) or 1-L (32-oz) size. The wi bottle s internal delivery tube provides for delivery of the sample gas to the bottom of the bottle. A l2.S-mm ( A-in.) hole cut in the bottle s cap provides access for the detector tube and vent for the purge gas (Fig. I). (An alternate flow-through sampler may be fashioned using a I-gal Ziploc-type food storage bag. The flexible line enters one comer of the bag s open end and extends to the bottom of the bag. The opposite comer of the open end is used for tube access and sample vent. The remainder of the bag s top is sealed shut. The basic procedure for the sampler in Fig. 1 applies.)... 

Note 3—A suitable chamber may be devised from a polyethylene wash bottle of nominal S00>mL (16-oz) or 1 L (32-oz) size. The wash bottle s internal delivery tube provides for delivery of sample gas to the bottom of the bottle. A A>in. hole cut in the bottle s cap provides access for the detector tube and vent for the purge gas (Fig. I). 

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