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Manufacturing Insulated Glass Units with high-performance Soft-Coat Low-E is a delicate science. The microscopic Silver Layer on the glass surface is incredibly sensitive to friction and chemical contamination. If you are using generic racks with cheap, recycled rubber pads, you are likely introducing invisible Micro-scratches that only reveal themselves after the unit is sealed and installed. The first line of defense for your quality control is a Mobile Glass Trolley equipped with chemically inert EPDM protection. |
Not all rubber is created equal. Standard black rubber often contains carbon black and sulfur, which can migrate onto the glass surface, causing "ghosting" or oxidation spots on the Low-E coating. Furthermore, if the rubber is too hard, it crushes the glass edge; if it's too soft, it wears out instantly.
Our racks utilize specialized EPDM Rubber Profiles with a precisely calibrated Shore A hardness (typically 60-70). This material is chosen for its chemical stability—it does not react with soft coatings—and its mechanical resilience. It grips the glass firmly to prevent sliding but provides a "soft landing" that cushions the fragile edges against the steel frame.
Damage often happens when the glass is moving. As a trolley rolls across a concrete factory floor, every crack and bump transmits energy into the glass pack. If the ride is rough, the glass sheets vibrate against each other (glass-on-glass friction), destroying the coating instantly.
High-grade polyurethane wheels absorb floor vibrations, protecting the glass payload.
The solution lies in the wheels. We equip our trolleys with Shock-Absorbing Castors made from high-grade polyurethane (PU) bonded to a heavy-duty steel core. Unlike hard nylon wheels that rattle, PU wheels absorb floor imperfections. This ensures a smooth, gliding motion that keeps the glass stack static and stable, preserving the integrity of your high-value coatings from the cutting table to the furnace.
It's not just about the rubber. The geometry of the rack matters. A properly designed A-frame tilts the glass back at a specific angle (usually 5-6 degrees). This angle is calculated to transfer the weight to the back support profiles (where the rubber is) rather than the bottom edge.
By maximizing the surface area contact with the EPDM profiles, we reduce the pressure per square inch (PSI) on any single point of the glass. This even weight distribution is the key to preventing pressure cracks and ensuring that your reject bin stays empty.
1. Will the black rubber leave marks on the glass edge?
No. We use non-marking EPDM or specialized white composite rubber for high-sensitivity applications. These materials are formulated specifically to prevent carbon migration and marking, ensuring the glass comes off the rack as clean as it went on.
2. Can I replace the rubber profiles if they wear out?
Yes. The profiles are designed as a "slide-in" or "clip-on" system, not glued permanently. This allows your maintenance team to easily strip and re-rubber a rack in minutes, extending the asset's life without buying a new steel frame.
3. How does the castor material affect the glass?
Hard wheels (steel or nylon) transmit 100% of floor shock to the glass. Polyurethane (PU) wheels act as a suspension system. For transporting Soft-Coat Low-E, PU wheels are mandatory to prevent the micro-vibrations that cause coating abrasion.
4. Is the rack structure painted or powder coated?
We use electrostatic powder coating. This is superior to wet paint because it creates a thicker, chip-resistant finish. It eliminates the risk of rust flakes falling onto the glass, which is a common contaminant in clean-room environments.
5. What is the weight capacity per castor?
Our standard heavy-duty castors are rated for 450kg to 500kg each. A trolley with 4 wheels typically has a Safe Working Load (SWL) of around 1,500kg to 2,000kg, providing a huge safety margin even for thick laminated glass packs.
