Gain Magnet (PU & Silicone Series)

Secure Corrugated Ducts Instantly and Accurately

The Gain Magnet is specifically engineered for the precast concrete industry. Its purpose is to securely hold corrugated ducts, sheathing, or void tubes firmly against the steel formwork during the casting process. The stepped, conical top profile is designed to slide perfectly inside the duct, while the wider base creates a clean, chamfered recess in the concrete. Two Premium Material Options To suit different casting environments and demolding preferences, this series is available in two distinct materials:

1. Polyurethane (PU Series): Offers exceptional abrasion and tear resistance. This is the heavy-duty choice for high-frequency casting cycles where maximum durability and longevity are required.
2. Silicone (RD Series): Provides superior flexibility and outstanding non-stick release properties. It ensures effortless demolding and leaves a pristine, smooth concrete finish around the recess.

Heavy-Duty Magnetic Hold Encased in the base is a powerful Neodymium magnetic system providing either 105kg or 190kg of vertical pull force. This guarantees that your ducts won't float, shift, or disconnect during heavy vibration and concrete pouring, eliminating costly repositioning or patching work. Key Benefits:

• Zero Formwork Damage: No drilling or welding required; the magnetic grip preserves the life of your expensive steel tables.
• Accurate Positioning: Keeps ducts perfectly aligned and flush against the formwork.
• Leak-Proof: The flexible rubber/PU base creates a tight seal against the steel, preventing concrete slurry from entering the tube.
• Highly Reusable: Built to withstand hundreds of casting and demolding cycles.

Technical Specifications

PU Model	Silicone Model	Top Ø (Duct Size)	Top Height	Mid / Base Ø	Base Height	Pull-off Force
PU31.5	RD31.5	31.5 mm	30 mm	51.5 / 71.5 mm	20 mm	105 kg
PU36.5	RD36.5	36.5 mm	35 mm	51.5 / 71.5 mm	20 mm	105 kg
PU41.5	RD41.5	41.5 mm	30 mm	51.5 / 71.5 mm	20 mm	105 kg
PU50.5	RD50.5	50.5 mm	30 mm	56.5 / 76.5 mm	20 mm	105 kg
PU62.5	RD62.5	62.5 mm	30 mm	68.5 / 88.5 mm	20 mm	190 kg
PU71.5	RD71.5	71.5 mm	35 mm	77.5 / 97.5 mm	20 mm	190 kg
PU79.5	RD79.5	79.5 mm	35 mm	85.5 / 105.5 mm	20 mm	190 kg

Note: The Top Ø corresponds to the internal diameter of the corrugated duct. The base features a stepped design (Mid Ø expanding to Base Ø) to create the concrete recess and house the magnetic core.

Application Instructions

1. Prep: Ensure the steel casting table is clean and free of concrete residue.
2. Mounting: Place the Gain Magnet onto the steel table at the desired location. The integrated magnet will lock it down instantly.
3. Attach Duct: Slide your corrugated duct (gaine) over the protruding top section of the former. It should fit snugly.
4. Casting: Pour and vibrate the concrete. The seal prevents slurry ingress.
5. Demolding: Once the concrete cures, lift the element. The Gain Magnet will typically remain on the steel table or can be easily pulled out of the duct due to its flexible material.

Categories: Precast Concrete Accessories, Gain Magnets, Recess Formers, Shuttering Magnets Tags: gain magnet, polyurethane gain magnet, silicone recess former, precast magnet, corrugated pipe holder