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2. Spring steel - Wikipedia

   en.wikipedia.org/wiki/Spring_steel

   Spring steel is a name given to a wide range of steels [1] used in the manufacture of different products, including swords, saw blades, springs and many more. These steels are generally low-alloy manganese , medium-carbon steel or high-carbon steel with a very high yield strength .

3. Polyethylenimine - Wikipedia

   en.wikipedia.org/wiki/Polyethylenimine

   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.

4. Sandwich plate system - Wikipedia

   en.wikipedia.org/wiki/Sandwich_plate_system

   Sandwich Plate System (SPS) is the name of a patented structural composite material comprising two metal plates bonded with an elastomer core. SPS was created in partnership with chemical manufacturer BASF incorporating Elastocore ® [ 1 ] as the core material.

5. Polyetherimide - Wikipedia

   en.wikipedia.org/wiki/Polyetherimide

   The glass transition temperature of PEI is 217 °C (422 °F). Its amorphous density at 25 °C is 1.27 g/cm 3 (.046 lb/in³). It is prone to stress cracking in chlorinated solvents. Polyetherimide is able to resist high temperatures while maintaining stable electrical properties over a wide range of frequencies.

6. Surface plate - Wikipedia

   en.wikipedia.org/wiki/Surface_plate

   A 250 mm x 250 mm surface plate A surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, marking out (layout), and tooling setup. [ 1 ] The surface plate is often used as the baseline for all measurements to a workpiece, therefore one primary surface is finished extremely flat with tolerances ...

7. Leaf spring - Wikipedia

   en.wikipedia.org/wiki/Leaf_spring

   Originally called a laminated or carriage spring, and sometimes referred to as a semi-elliptical spring, elliptical spring, or cart spring, it is one of the oldest forms of vehicle suspension. A leaf spring is one or more narrow, arc-shaped, thin plates that are attached to the axle and chassis in a way that allows the leaf spring to flex ...