Shredded scrap metal, such as ISRI 211, is a crucial commodity in the recycling industry. Understanding its average density is essential for various reasons, including transportation, pricing, and process optimization. Testing the average density of shredded scrap ISRI 211 involves precise methodologies and considerations to ensure accuracy and reliability. In this blog post, we’ll delve into the methods and factors to consider when testing the average density of shredded scrap ISRI 211.

Understanding What is  ISRI 211

ISRI 211 refers to shredded scrap steel, predominantly generated from automobiles and light gauge steel. It typically contains a mix of materials, including steel, non-ferrous metals, plastics, and other contaminants. Given its heterogeneous nature, determining its average density requires meticulous testing procedures.

Methods for Testing Average Density

Displacement Method

  • This method involves immersing a known volume of shredded scrap ISRI 211 in a liquid and measuring the displacement.
  • Choose a liquid that does not react with the materials in the scrap and is easily measurable.
  • Measure the volume of the liquid displaced before and after immersing the shredded scrap. The difference in volumes gives the volume of the shredded scrap.
  • Divide the mass of the shredded scrap by its volume to obtain the average density.

Gravimetric Method:

  • In this method, a known mass of shredded scrap ISRI 211 is placed on a balance, and its volume is measured indirectly.
  • The shredded scrap is compacted as much as possible to eliminate voids.
  • Measure the mass of the compacted scrap.
  • Calculate the volume using the dimensions of the container or by measuring the displacement of water when the scrap is submerged.
  • Divide the mass by the volume to determine the average density.

Factors to Consider while Testing the Average Density of Shredded Scrap ISRI 211

  • Ensure that the shredded scrap is representative of the entire lot. Random sampling techniques can help achieve this.
  • Remove any contaminants or materials that are not part of ISRI 211 to obtain accurate results.
  • Moisture can significantly affect the density of shredded scrap. It is essential to either dry the sample before testing or account for moisture content in calculus
  • Shredded scrap ISRI 211 may have varying particle sizes, which can impact its density. Consider the particle size distribution when interpreting density measurements.
  • Density measurements can be influenced by temperature and pressure variations. Standardize these parameters during testing for consistency and accuracy.

Shredded Steel Scrap ISRI 211 Specification

ISRI 211 is a specific grade of shredded steel scrap that adheres to certain specifications set forth by the Institute of Scrap Recycling Industries (ISRI). These specifications help standardize the quality of shredded steel scrap and facilitate its trade and processing within the recycling industry. Below are the typical specifications for shredded steel scrap ISRI 211:

  1. Composition: Shredded steel scrap ISRI 211 primarily consists of homogeneous iron and steel scrap, which may include automobile bodies and sheet scrap, but should be free of all other materials, except for incidental amounts that might be present in automobiles or automobile parts, such as dirt, glass, rubber, or plastics.
  2. Density: The shredded scrap should have a relatively uniform density. However, slight variations may exist due to the nature of shredding processes and the mix of materials.
  3. Size: The scrap should be processed through a shredding machine, resulting in small, fist-sized or smaller pieces. However, some variations in size are expected within this range.
  1. Magnetic Content: Shredded steel scrap ISRI 211 should be magnetically separated material, primarily consisting of iron and steel. It should exhibit high ferrous content, allowing it to be easily attracted by magnets.
  2. Purity: The shredded scrap should be relatively free of contaminants, such as non-ferrous metals, excessive dirt, or other materials not consistent with steel scrap. However, minor levels of contaminants may be present as long as they do not significantly affect the quality or usability of the material.
  3. Processing: Shredded steel scrap ISRI 211 may undergo further processing steps, such as sorting, cleaning, or compacting, to meet specific customer requirements or quality standards.

It’s essential for buyers and sellers of shredded steel scrap ISRI 211 to verify that the material meets these specifications to ensure its suitability for various applications, such as steelmaking in foundries and steel mills. Adhering to these standards helps maintain consistency in quality, enhances efficiency in recycling processes, and promotes sustainable resource management practices within the scrap metal industry.

ISRI Code List

Each ISRI code corresponds to a specific category of scrap material recognized by the Institute of Scrap Recycling Industries (ISRI). Here’s an explanation for some of the common ISRI codes:

ISRI 200: Heavy Melting Steel (HMS) – This code represents heavy melting steel scrap, typically derived from dismantled structures, vehicles, or machinery. It includes a mix of ferrous materials, such as beams, plates, and structural steel.

ISRI 201: Shredded Scrap – Shredded scrap consists of ferrous scrap that has been processed through a shredder, resulting in small, uniform pieces. It’s commonly used in steelmaking processes due to its ease of handling and melting properties.

ISRI 211: Shredded Scrap – Similar to ISRI 201, ISRI 211 specifically denotes shredded scrap with certain size and density specifications. It’s often used as a raw material in steel mills for producing new steel products.

ISRI 213: No. 1 Dealer Bundles – This code refers to clean, new steel scrap generated by industrial or commercial sources, typically in the form of clean, uncoated steel sheets, bars, or wire.

ISRI 217: HMS Mixed – HMS Mixed represents a mix of heavy melting steel scrap that may contain various grades and sizes of ferrous materials. It’s commonly sourced from demolition projects, industrial machinery, and obsolete equipment.

ISRI 228: Steel Turnings – Steel turnings consist of small, scrap metal pieces generated during machining or manufacturing processes. They’re often collected for recycling due to their high iron content.

ISRI 229: Alloy Scrap – Alloy scrap includes various ferrous materials containing alloying elements such as chromium, nickel, or molybdenum. It’s typically sourced from industrial processes, manufacturing scrap, or end-of-life products.

These ISRI codes serve as standardized identifiers within the scrap recycling industry, facilitating communication and trade among recyclers, scrap processors, and consumers of recycled materials. They help ensure clarity and consistency in the classification and trading of scrap materials, which is essential for efficient recycling operations and sustainable resource management.

As a leading provider of analytical instruments and equipment, Mcneil Instruments offers solutions to fulfill your needs of industries involved in scrap metal recycling, including the testing of shredded steel scrap ISRI 211. With their expertise in analytical technologies and commitment to quality, Mcneil Instruments empowers businesses to accurately assess the average density and other crucial parameters of shredded scrap materials. By utilizing Mcneil Instruments’ advanced instruments and support services, scrap metal recyclers can enhance their operational efficiency, ensure compliance with industry standards, and ultimately contribute to the sustainable management of metal resources. Trust Mcneil Instruments to deliver reliable solutions for your scrap metal analysis needs.