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2. Filler (materials) - Wikipedia

   en.wikipedia.org/wiki/Filler_(materials)

   Filler materials are particles added to binders (resin, thermoplastics, cement) to make a composite material. Filler materials improve specific properties or make the product cheaper. [1] Coarse filler materials such as construction aggregate and rebar are used in the building industry to make plaster, mortar and concrete.

3. Primer (firearms) - Wikipedia

   en.wikipedia.org/wiki/Primer_(firearms)

   Primer-actuated cartridges/piston primer cartridges use a primer in the form of a blank to contain the propellant within the cartridge, or as a piston to unlock the bolt and cycle the weapon's operation. Examples are the 9×51mm SMAW, MBA Javette and the M48A2.

4. List of military headstamps - Wikipedia

   en.wikipedia.org/wiki/List_of_military_headstamps

   The third line listed the model of primer (Zdh, or zundhuetchen), the date of manufacture, and the manufacturer; an "X" between the primer type and date of manufacture indicated it was a type of primer with a low mercury content. C Munitionsfabrik Cassel ("Ammunition Factory at Kassel") – Kassel, Hesse-Nassau, Germany. Closed after the war.

5. List of the United States Army weapons by supply catalog ...

   en.wikipedia.org/wiki/List_of_the_United_States...

   Ordnance crest "WHAT'S IN A NAME" - military education about SNL. This is a historic (index) list of United States Army weapons and materiel, by their Standard Nomenclature List (SNL) group and individual designations — an alpha-numeric nomenclature system used in the United States Army Ordnance Corps Supply Catalogues used from about 1930 to about 1958.

6. Polyurethane - Wikipedia

   en.wikipedia.org/wiki/Polyurethane

   Polyurethane synthesis, wherein the urethane groups −NH−(C=O)−O− link the molecular units A kitchen sponge made of polyurethane foam . Polyurethane (/ ˌ p ɒ l i ˈ jʊər ə ˌ θ eɪ n,-j ʊəˈr ɛ θ eɪ n /; [1] often abbreviated PUR and PU) refers to a class of polymers composed of organic units joined by carbamate (urethane) links.

7. Percussion cap - Wikipedia

   en.wikipedia.org/wiki/Percussion_cap

   Percussion caps have been manufactured in various sizes to fit snugly over different sized nipples. Nipples for 4.5mm and 6mm percussion caps. The percussion cap, percussion primer, or caplock, introduced in the early 1820s, is a type of single-use percussion ignition device for muzzle loader firearm locks enabling them to fire reliably in any weather condition. [1]