Grate and Tube Magnets

Magnetic Products Inc. (MPI) Grate Magnets and Magnetic Tubes are engineered to effectively remove ferrous metal contaminants from various product streams, ensuring product purity and protecting processing equipment. Designed for use in gravity-fed systems, MPI Grate Magnets provide high-intensity magnetic separation in a compact, versatile form, making them ideal for industries such as food processing, plastics, pharmaceuticals, and chemicals. MPI Magnetic Tubes, made in the USA, offer a flexible and efficient solution for capturing small to medium-sized ferrous contaminants in both dry and liquid products. Built for durability, these tube magnets feature fully welded end plugs with 1/4”-20 tapped holes, eliminating the need for crimped or mechanically sealed components. Whether used individually or as part of a grate magnet assembly, MPI’s magnetic solutions deliver superior protection and performance across various applications.

Grate Magnet

Tube Magnet

MPI grate magnets are designed to effectively remove medium and small ferrous tramp metal contaminants from dry, granular product streams in various applications like gravity-fed chutes, hoppers, and bins. Known as hopper magnets or magnetic separators, these devices are easy to install and maintain, providing economical magnetic protection for processing equipment such as milling and mixing. The system consists of a series of 1-inch diameter magnetic tubes arranged with 1-inch spacing, supported by a durable welded stainless-steel frame. As contaminants are attracted, they accumulate on the underside of the tubes, preventing any “wash-off.” All components are fully welded for maximum durability, and MPI grate magnets are proudly made in the USA.

MPI magnetic tubes, made in the USA, effectively remove small to medium ferrous tramp metal contaminants from various product streams, including both dry and liquid products. These tubes address contamination caused by metal wear, protecting process equipment and ensuring a high-quality metal-free output. Each tube features fully welded ends with 1/4”-20 tapped holes for durability and easy installation, eliminating the use of crimped or mechanically sealed end plugs. Product streams flow around the 1” diameter tube magnets, capturing contaminants which then settle beneath the tubes, preventing wash-off. Designed for easy cleaning, the tubes provide efficient ferrous metal filtration and can be used individually or in multiple row configurations.

View Grate Magnet

View Tube Magnet

Compatibility Check - Magnetic Grates & Tubes

Unique Benefits and Considerations

Features/Benefits	Square Grate Magnets	Round Grate Magnets	Magnetic Tubes
Design	Square-shaped, ideal for hoppers and bins with square openings	Round shape, suited for round openings like pipes and chutes	Individual magnetic rods that can be used in various configurations
Magnetic Strength	Ceramic or high-intensity rare-earth magnets available	Ceramic or high-intensity rare-earth magnets available	Ceramic or high-intensity rare-earth magnets available
Contaminant Capture	Effectively captures ferrous metal contaminants in dry and free-flowing materials	Excellent for fine ferrous contamination in powders, pellets, and granular materials	Strong capture capability, but depends on spacing and arrangement
Ease of Installation	Drop-in design for easy installation in square or rectangular openings	Drop-in design for round openings, easy to retrofit	Flexible placement in existing equipment or custom housing
Ease of Cleaning	Easy to remove and clean, available in manual or self-cleaning options	Similar to square grates, easy to clean manually or automatically	Can be time-consuming to clean individually
Best Use Cases	Dry powders, granules, and free-flowing materials in square or rectangular processing lines	Dry powders, granules, and free-flowing materials in round processing lines	Dry powders, granules, and free-flowing materials in
Durability	Made from stainless steel, highly durable	Made from stainless steel, highly durable	Made from stainless steel, highly durable
Customizability	Custom sizes and configurations available	Custom sizes and configurations available	Fully customizable in terms of length and arrangement

Industries, Applications and Regulations

Industry Type

MPI Grate Magnets and Magnetic Tubes are widely used across various industries that require contamination control and equipment protection. Key industries include:

Food Processing – Prevents ferrous contamination in bulk powders, spices, grains, dairy products, and other food ingredients.
Plastics & Rubber – Ensures the purity of plastic resins, pellets, and regrind materials to improve final product quality and prevent machinery wear.
Pharmaceuticals – Maintains strict contamination control in powdered medications, tablets, and other pharmaceutical production processes.
Chemicals & Petrochemicals – Removes ferrous contaminants from fine chemical powders, granules, and liquids used in industrial processing.
Mining & Aggregate – Extracts metal particles from crushed rock, sand, and other mining materials before further processing.
Recycling & Waste Processing – Helps recover valuable metal from shredded materials, e-waste, and other recyclable goods.
Powder & Bulk Solids Handling – Used in any process involving dry powders, granules, or bulk materials in conveying or storage applications.
Ceramics & Glass Manufacturing – Ensures the quality of fine ceramic powders and glass materials by removing metal contaminants.

Processing Application

Grate Magnets and Magnetic Tubes are designed for a wide range of applications, including:

Gravity-Fed Material Flow Systems – Installed in hoppers, chutes, and ducts where materials flow naturally by gravity.
Bulk Material Handling – Placed in bins, silos, or feeders to capture tramp metal before processing.
Injection Molding & Extrusion – Used in plastic and rubber industries to prevent metal contamination in raw materials.
Powder Processing & Blending – Integrated into mixing and milling equipment to maintain product purity.
Pneumatic & Liquid Processing Lines – Magnetic tubes can be housed in custom enclosures for use in liquid and semi-liquid material processing.
Metal Detection & Separation – Used as a preliminary step before more advanced separation equipment like eddy current separators.
Packaging & Final Product Inspection – Ensures ferrous metal contamination is removed before products reach consumers.

Regulations and Requirements

MPI Grate Magnets and Magnetic Tubes help industries comply with stringent regulations, codes, and quality standards by ensuring product purity and preventing contamination. Key compliance areas include:

Food Safety & Quality Standards

FDA (Food and Drug Administration - USA)
Ensures food-grade materials and sanitary design to prevent contamination.
FSMA (Food Safety Modernization Act - USA)
Requires preventive controls for food manufacturers, including contamination detection.
USDA (United States Department of Agriculture)
Compliance with sanitary processing requirements for meat, poultry, and dairy production.
GFSI (Global Food Safety Initiative) Standards
Includes major certification programs such as:
SQF (Safe Quality Food)
BRC (British Retail Consortium)
FSSC 22000 (Food Safety System Certification)
HACCP (Hazard Analysis and Critical Control Points)
Recognized globally as a risk-based approach to food safety, requiring foreign material controls.
EHEDG (European Hygienic Engineering & Design Group)
Ensures equipment meets hygienic design principles for food safety.

Pharmaceutical & Medical Standards

cGMP (Current Good Manufacturing Practices - FDA)
Requires strict contamination control in pharmaceutical and medical product manufacturing.
USP (United States Pharmacopeia) Standards
Ensures compliance in drug and supplement production to prevent contamination.

Industrial & Manufacturing Standards

ISO 9001 (Quality Management System)
Magnetic separation equipment contributes to meeting quality management principles.
ISO 22000 (Food Safety Management System)
Requires foreign material control as part of food safety hazard analysis.
ANSI (American National Standards Institute) / ASME (American Society of Mechanical Engineers)
Ensures compliance with industrial material handling and processing standards.
OSHA (Occupational Safety and Health Administration - USA)
Helps prevent workplace hazards related to metal contamination in processing equipment.

Plastics & Chemical Industry Compliance

ASTM (American Society for Testing and Materials)
Magnetic separation contributes to meeting material purity standards in polymer and chemical processing.
REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals - EU)
Ensures compliance in chemical handling and product safety.

Environmental & Recycling Standards

EPA (Environmental Protection Agency - USA)
Helps in hazardous material handling and compliance with waste management regulations.
Zero Waste & Sustainability Initiatives

Used in recycling and metal recovery processes to reduce environmental impact.

How Grate & Tube Magnets Help Meet These Standards

Prevents ferrous contamination in food, pharmaceuticals, plastics, and other critical materials.
Helps meet foreign material control requirements in HACCP, FSMA, and GMP programs.
Protects processing equipment, reducing maintenance and production downtime.
Ensures compliance with food-grade and sanitary design standards for sensitive industries.

For assistance in selecting the most suitable grate magnet or magnetic tube configuration for your application or for additional customization options, contact Magnetic Products Inc. today to speak with our team of experts!