What is the “DIN Standard” referred to in the Storz pages of the catalog?

DIN is an abbreviation for the Deutsches Institut für Normung e. V, an institution of trade and industry responsible for the preparation of National Standards in Germany. Storz fittings were patented in Europe by Carl August Guido Storz over one hundred years ago and are now is use worldwide. DIN publishes standards for the design of these Storz fittings. Although the catalog refers to the “DIN Standard,” there are actually a number of standards that apply, one for each size and type of Storz coupling or adapter. All of the Standards for aluminum fittings are in the DIN 143xx series. For instance, DIN 14303 covers Size B (75mm) Aluminum Delivery Hose Couplings for Fire Brigade Use. This standard specifies that the Storz head be a DIN 1725 Part 1 aluminum forging. Cast aluminum Storz fittings can be used for nonfirefighting, lower pressure applications such as agriculture. In the interests of the safety of the “Fire Brigade,” all Storz couplings, adapters and caps supplied by Red Head Brass are made from aluminum forgings.
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What is the difference between a forging and a casting?

Forgings are manufactured by pressing metal under great pressure into parts that, as a result, have high strength. The metal is typically heated, but not melted, before forging. In the casting process, the metal is melted before going into a mold. The metal poured into the mold solidifies as it cools. The control of the molten metal temperature is critical. Likewise, the quality of the metal being melted must be controlled so that no impurities get into the molten metal. Any gases that are trapped can create porosity as the metal cools. Low casting temperature and impurities, such as sand or slag, can cause imperfections known as cold shots. Metallurgically, a casting has no grain flow or directional strength. A casting can contain many unseen defects. Forgings, on the other hand, have no internal voids that can cause unexpected failures. The grain structure of a forging is oriented to part shape for greater strength. A forging has greater density. In general, forgings are seen as having a higher integrity and greater reliability than castings.