Polyisobutylene is often used by the explosives industry as a binding agent in plastic explosives such as C-4.

Polyisobutylene, also known as " PIB " or polyisobutene, ( C < sub > 4 </ sub > H < sub > 8 </ sub >)< sub > n </ sub >, is the homopolymer of isobutylene, or 2-methyl-1-propene, on which butyl rubber is based.

Polyisobutylene is a colorless to light yellow viscoelastic material.

Polyisobutylene and butyl rubber are used in the manufacture of adhesives, agricultural chemicals, fiber optic compounds, ball bladders, caulks and sealants, cling film, electrical fluids, lubricants ( 2 cycle engine oil ), paper and pulp, personal care products, pigment concentrates, for rubber and polymer modification, for protecting and sealing certain equipment for use in areas where chemical weapons are present, as a gasoline / diesel fuel additive, and even in chewing gum.

Polyisobutylene ( in the form of polyisobutylene succinimide, PIBSI ) has interesting properties when used as an additive in lubricating oils and motor fuels.

Polyisobutylene added in small amounts to the lubricating oils used in machining results in a significant reduction in the generation of oil mist and thus reduces the operator's inhalation of oil mist.

Polyisobutylene is used in some formulations as a thickening agent.

Polyisobutylene binder is used because it makes the explosive more insensitive to premature detonation as well as making it easier to handle and mold.

But her prettiness was what he had noticed first, and all the other things had come afterward: cruelty, meanness, self-will.

There was an artificial lake just out of sight in the first stand of trees, fed by a half dozen springs that popped out of the ground above the hillside orchard.

The first part of the road was steep, but it leveled off after the second bend and curled gradually into the valley.

No one was behind it, but in the rear wall of the office I noticed, for the first time, a door which had been left partially open.

The herd was watered and then thrown onto a broad grass flat which was to be the first night's bedground.

Once again, Tom Horn was the first and most likely suspect, and he was brought in for questioning immediately.

For Matilda, it was the first she had known in many a night.

Even the knowledge that she was losing another boy, as a mother always does when a marriage is made, did not prevent her from having the first carefree, dreamless sleep that she had known since they dropped down the canyon and into Bear Valley, way, way back there when they were crossing those other mountains.

Stevens was grunting over the last empty pocket when Russ abruptly rose and lunged toward Carmer's hat, which had tumbled half-a-dozen feet away when he first fell.

The Indian's arm whipped sidewise -- there was a flash of amber and froth, the crash of the bottle shattering against the side of the first car.

It was her first smile.

At first, I thought he was out of his head, talking wildly like this.

Hell, I gave him the first decent job he ever had, six, seven -- how many years ago was it, Rob ''??

Miss Langford ( her first name was Evelyn ) was an attractive girl.

School began in August, the hottest part of the year, and for the first few days Miss Langford was very lenient with the children, letting them play a lot and the new ones sort of get acquainted with one another.

It was just as well that the ignorant Dandy enjoyed himself to the hilt that first evening, for the room was to become his prison cell.

`` Bastards '', he would say, `` all I did was put a beat to that Vivaldi stuff, and the first chair clobbered me ''!!

In 1961 the first important legislative victory of the Kennedy Administration came when the principle of national responsibility for local economic distress won out over a `` state's-responsibility '' proposal -- provision was made for payment for unemployment relief by nation-wide taxation rather than by a levy only on those states afflicted with manpower surplus.

The first systematic thinking about this Pandora's box within Pandora's boxes was done four years ago by Fred Ikle, a frail, meek-mannered Swiss-born sociologist.

The smell at first was more surprising than unpleasant.

His collaboration with Washington, begun when he was the general's aide during the Revolution, was resumed when he entered the first Cabinet as Secretary of the Treasury.

Often it is recognized that all the details of the pattern may not be essential to the outcome but, because the pattern was empirically determined and not developed through theoretical understanding, one is never quite certain which behavior elements are effective, and the whole pattern becomes ritualized.

Being somewhat delicate in health, at the age of sixteen he was sent to Southern Europe, for which he at once developed a passion, so that he spent nearly all of the following ten years abroad, at first in Italy, then in Greece, Egypt, Asia Minor, and Palestine.

The portrait that had developed, fragmentarily but consistently, was the portrait of a man to whom serious thinking is alien enough that the making of a decision inhibits, when it does not forestall, any ability to review the decision in the light of new evidence.

A prototype which fulfills the requirements was developed and thoroughly tested.

While there are now allegations of the withholding of `` favorable evidence developed at the hearing '' and a denial of a `` full and fair hearing '', no such claim was made by petitioner at any stage of the administrative process.

He was an ardent champion of the Brown & Sharpe Apprentice Program and personal counselor to countless able men who first developed their industrial talents with the company.

A project for the Air Force has been completed in which the NAIR infrared detecting device was developed for area monitoring of noxious or dangerous gases.

Except for a rich friendship with the painter, Chauncey Ryder who gave him the only professional instruction he ever had -- and this was limited to a few lessons, though the two artists often went on painting trips together -- Roy developed his art by himself.

Together they also developed a new form of voltaic cell in which the wooden trough was replaced by one of copper, thereby producing stronger currents.

Of interest is a recent announcement by Du Pont's Polychemicals Dept. of a new methyl methacrylate monomer designated as Monocite H 100, which was developed specifically for production of cast acrylic sheets for the sign and lighting industry.

In September, 1958, the patient developed generalized weakness and fatigue which was concurrent with exacerbation of his anemia ; ;

The same system, with minor modifications, was developed in Ruanda-Urundi under Belgian administration.

An objective scale was developed for rating school neighborhoods from these data.

Final ratings were made on the basis of a point system which was developed after studying the distributions of actual behaviors recorded and assigning weight values to each type of behavior that was deviant from the discovered norms.

Recently, for example, a paranoid woman's large-scale philosophizing, in the session, about the intrusive curiosity which has become, in her opinion, a deplorable characteristic of mid-twentieth-century human culture, developed itself, before the end of the session, into a suspicion that I was surreptitiously peeking at her partially exposed breast, as indeed I was.

Much which was in embryo in 1000 had become reasonably well developed by 800.

Greek civilization was swirling toward its great revolution, in which the developed qualities of the Hellenic outlook were suddenly to break forth.

Hardy's two productive decades were separated by forty years, yet between them he developed only in that he became more steadily himself -- it was a narrowing, not an expanding process.

What Parker and his contemporaries -- Gillespie, Davis, Monk, Roach ( Tristano is an anomaly ), etc. -- did was to absorb the musical ornamentation of the older jazz into the basic structure, of which it then became an integral part, and with which it then developed.

the verse of Beowulf or of The Iliad and The Odyssey was not easy to create but was not impossible for poets who had developed their talents perforce in earning a livelihood.

The major contributor was a shopping center with houses being added to the system as the subdivision developed.

special equipment required for registering respiration and for recording the contraction of smooth muscles under various conditions was developed by the Instruments Section ( Victor Jackman, W. C. Barnes, J. F. Reiss ) ; ;