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Polyethylenimine (PEI) or polyaziridine is a polymer with repeating units composed of the amine group and two carbon aliphatic CH 2 CH 2 spacers. Linear polyethyleneimines contain all secondary amines, in contrast to branched PEIs which contain primary, secondary and tertiary amino groups.
A Cartesian mechanism permits placement of material anywhere in a cubic volume; this design has continued throughout development of the i3 series. The flat "print bed" (the surface on which parts are printed) is movable in one axis (Y), while two horizontal and two vertical rods permit tool motion in two axes, designated X and Z respectively.
[citation needed] Al–Li is also produced in rolls as wide as 220 inches (18 feet; 5.6 metres), which can reduce the number of joins. [ 16 ] Although aluminium–lithium alloys are generally superior to aluminium–copper or aluminium–zinc alloys in ultimate strength-to-weight ratio, their poor fatigue strength under compression remains a ...
Polyetherimide (PEI; branded as Ultem [1]) is an amorphous, amber-to-transparent thermoplastic with characteristics similar to the related plastic PEEK. When comparing PEI to PEEK, the former is cheaper but has lower impact strength and a tighter temperature range.
In 2001, the [US intelligence community] became aware that Iraq was attempting to procure 60,000 high-strength aluminum tubes manufactured from 7075-T6 aluminum, with an outer diameter of 81 mm, and inner diameter of 74.4 mm, a wall thickness of 3.3 mm and a length of 900 mm. The tubes were to be anodized using chromic acid and were to be ...
An aluminium alloy (UK/IUPAC) or aluminum alloy (NA; see spelling differences) is an alloy in which aluminium (Al) is the predominant metal. The typical alloying elements are copper , magnesium , manganese , silicon , tin , nickel and zinc .
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