WHY YOU GET SO MUCH MORE THAN A GLASS WITH PYREX· LABWARE Run an analysis and you'll find that PYREX N O . 7740 glass hasn't changed one-tenth of a whit in twenty-five years. It hasn't had to. Chemists the world over agreed long ago that N o . 7740 gave a nigh perfect balance of chemi cal, physical, and thermal properties. PYREX labware itself has changed a lot in those years. The order of the day every day in our labware department is: Design. Redesign. Refine. Find out what the customers want and give it to them. Teflon* stopcocks, for example. It won't be long before everyone makes a Teflon stopcock. We went at it with a difference, though. Our men decided to look at the stopcock itself afresh. They came up with the reverse-taper stopcock, a completely new concept. Reverse the taper and you have a stop cock that's under constant tension and needs no adjustment to form a seal. It adjusts itself automatically without the aid of locknuts or other devices. It works freely and dismantles in a jiffy. All this, plus the advantages of Teflon. Ware for the Lilliputians. When the needs of the micro-chemists became known, we introduced a line of ware r®
made to classical proportions but made to hold drops at a time. It includes not only flasks and beakers and the other usuals, but all the accessories you could want. Wholly macro. Then there are the men who want to work big, who want gal lons of something without going to the expense or bother of a pilot plant. A few tremendous puffs and we have a line of macro ware; giant reaction flasks of 5, 10 and 20-gallon capacity, all with covers and such accessories as inlet tubes, condensers, thermometer wells and the like. What can you do with a pipet? A pipet seems a simple enough device, but hardly a year goes by that we don't offer an improvement of some sort. A new way of marking called Accured, for example. Instead of laying the marks on the glass with stencils or filled etchings, we invented a way of putting the marks into the glass, mak ing them an integral part of the pipet, that will last as long as the glass. Again, a completely new approach to an old problem. As soon as we found there was a need, we designed a pipet with a long, narrow tip for insertion into confined
PYREX laboratory ware
areas such as the neck of a micro flask. We made another with an extra-large hole in the tip to make suction and de livery easier and faster. Some years back we came up with the idea of stoning two bevels on the tips of pipets to make them smooth enough to avoid a snag, strong enough to resist chipping. Shielded cylinders. Some ideas are oneshots. We heard that labmen were hav ing trouble with the cylinders which they used when going about the plant to gather production samples. We looked the problem over and came up with a metal shield for the cylinder, a shield with a built-on carrying handle. Now the cylinders can take some knocking around without being broken or dropped. There's so much more. The point of all this is what we said above: there's a lot that's new about PYREX labware. There always will be. *Teflon is a Du Pont trademark
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