Precast concrete magnets (also known as embedded magnets or concrete embedded magnets) are widely used in construction, industrial equipment, exhibitions and other fields to fix, hang or dock metal parts. Choosing the right precast concrete magnet requires comprehensive consideration of multiple technical indicators to ensure its performance, durability and safety. The following are some important influencing factors:
1. Magnet pulling force (adsorption force) The pulling force of the magnet is the core indicator, which directly determines its load-bearing capacity.
Things to note when purchasing:
Clear requirements: Determine the required pulling force according to the actual application scenario (such as hanging tools, fixed steel structures, exhibition props, etc.). Common specifications range from tens of kilograms to hundreds of kilograms.
Test standard: Magnet pulling force is usually marked as "vertical pulling force" or "shear force", and the test conditions (such as how thick the steel plate is in contact with) need to be confirmed.
Safety margin: It is recommended to choose a model with a pulling force 20%-30% higher than the actual demand to cope with dynamic loads or magnetic attenuation after long-term use.
2. Shell material
The magnet shell needs to have the dual functions of protecting the magnet and facilitating installation. Common materials include:
Stainless steel (such as 304/316): Strong corrosion resistance, suitable for humid or outdoor environments (such as swimming pools, coastal buildings).
Galvanized steel: High cost performance, but not as rust-proof as stainless steel, suitable for dry indoor environments.
Engineering plastics: Lightweight and insulating, but with low load-bearing capacity, mostly used for electronic equipment or temporary fixation.
Recommendation: Stainless steel shells are preferred, especially in humid, acidic and alkaline environments.
3. Rust prevention and sealing treatment
Prefabricated magnets are embedded in concrete for a long time, so rust prevention is crucial:
Surface treatment: Check whether it has been nickel-plated, epoxy-coated or passivated to resist alkaline corrosion of concrete.
Sealing design: High-quality magnets will use rubber rings or glue-filling technology to prevent moisture from penetrating into the magnet.
Weather resistance: For outdoor use, products with IP65 or above protection level must be selected.
4. Ease of installation and removal
Prefabricated magnets need to be embedded before concrete pouring, and the installation method affects the ease of construction:
Threaded hole design: allows the position to be adjusted with bolts later, suitable for scenarios that require flexibility.
Welded brackets or anchors: suitable for heavy-duty fixation to ensure that the magnets do not shift in the concrete.
Embedded vs. surface installation:
Embedded: The magnets are completely embedded in the concrete, with a flat surface, suitable for floor or wall applications.
Surface installation: The magnets are exposed, which is easy to replace, but may affect the appearance and safety.
Purchase advice: Confirm the thickness of the concrete pouring and ensure that the magnets are embedded deep enough (usually ≥50mm).
If later adjustment is required, choose models with threaded or removable designs.
5. Temperature and environmental adaptability
Different magnet materials have different temperature sensitivities:
NdFeB: The strongest magnetic force, but high temperature (>80°C) may cause demagnetization.
Ferrite: High temperature resistant (up to 250°C), but weak magnetic force.
AlNiCo: Good high temperature stability, but high cost.
Purchase suggestions:
Avoid using NdFeB in high temperature environments (such as workshops and boiler rooms), and use ferrite or AlNiCo magnets instead.
Other key considerations
Anti-vibration design: If used in vibrating equipment, the magnets need to have cushioning rubber or a locking mechanism.
Certifications and standards: Check for compliance with industry standards such as ISO 9001, CE or ASTM.
Supplier reputation: Choose a professional manufacturer like LSC to ensure material authenticity and after-sales service.
