Durostone CFR767 sheet refers to a specialized synthetic stone sheet from the German brand Durostone. It's a composite material sheet specifically designed for the high-temperature, highly corrosive conditions of PCB (Printed Circuit Board) assembly, and is commonly used to manufacture components such as soldering trays in wave soldering and reflow soldering processes.
CFR767 Durostone Sheet, a synthetic stone slab designed by Laurel specifically for demanding welding conditions, has advantages primarily in its suitability for the high-temperature and corrosive environments of electronic manufacturing. Its applications and uses revolve around the core scenario of PCB soldering. The following is a detailed explanation:
Key Advantages
Exceptional High-Temperature Stability: The resin used in this board can withstand temperatures up to 300℃. Even under extreme conditions such as solder bath temperatures exceeding 265℃ and PCB preheating exceeding 140℃, it maintains stable operation, fully compatible with high-temperature processes like lead-free soldering, and will not experience delamination at high temperatures.
Outstanding Corrosion Resistance: It exhibits exceptional resistance to highly corrosive fluxes containing halides and dicarboxylic acids used in mass production of electronic products. Compared to ordinary materials whose lifespan is significantly shortened under the influence of such fluxes, it effectively avoids self-degradation, significantly extending its service life in mass production scenarios.
Suitable for Precision Machining and Use: With low thermal conductivity and excellent machinability, it can be precisely machined into complex tray shapes to fit various PCB sizes. Simultaneously, it maintains good mechanical strength and dimensional stability even at high temperatures. As a load-bearing component, it ensures the precision of PCB soldering and prevents contamination of PCB components such as gold fingers from human contact.
Adaptability to Precision Machining and Use: It has anti-static properties: its material is a composite material of glass fiber and anti-static high mechanical strength resin. The anti-static property can prevent electronic components from being damaged by static electricity accumulation during the soldering process, which meets the anti-static requirements of electronic manufacturing materials.
Main Disadvantages
High Cost: As a high-end specialized material from the German company Löhrling, its import and manufacturing costs are higher than ordinary synthetic stone or other general welding tooling materials, increasing the investment of electronics factories in tooling consumables.
Limited Toughness and Insufficient Impact Resistance: Similar to most synthetic stones, it has sufficient hardness but poor toughness. If subjected to heavy impacts during transportation, installation, or use, especially at the edges and corners, it is prone to cracking or even breakage, requiring strict storage and handling procedures.
Processing and Maintenance Require Specialized Skills: This sheet material needs to be processed into customized pallets before use. Its precision machining requires specialized equipment and a technical team. If a large amount of residual flux adheres to the surface during subsequent use, it must be treated with a special cleaning agent. Ordinary cleaning methods are difficult to thoroughly remove, and improper maintenance can easily affect its service life.
Most Common Applications
This product is primarily used in the PCB (Printed Circuit Board) assembly stage of the electronics manufacturing industry, most notably in wave soldering and reflow soldering processes within surface mount technology. It is often manufactured as a soldering tray, reflow oven fixture, and other carriers, and is widely used in production lines for various industries requiring mass PCB soldering, such as consumer electronics, automotive electronics, and industrial control boards. High-frequency applications include motherboard soldering in mobile phones and computers, and the assembly of automotive central control circuit boards.
Specific Usage Instructions
Custom Processing: First, based on the dimensions and component distribution of the PCB board to be soldered, use specialized processing equipment to cut, drill, and engrave the Durostone CFR767 sheet to create a soldering tray that precisely matches the PCB board. This includes pre-drilled holes for component clearance and positioning pins to ensure a secure embedding of the PCB board.
Tooling Installation: Install the processed tray onto the transport track of the wave soldering or reflow soldering equipment. Check that the tray is securely fixed to prevent displacement during soldering and ensure soldering accuracy.
Soldering with Load: Smoothly place the PCB board into the corresponding positioning slot on the tray, ensuring the solderable side of the PCB board faces the solder. The tray then moves along the transport track into the high-temperature soldering zone of the equipment. The high-temperature and flux-resistant properties of the sheet material ensure the PCB board remains stable during soldering, protected from high temperatures and flux corrosion.
Subsequent cleaning and maintenance: After soldering, remove the PCB board and promptly clean the surface of the tray with a special cleaning agent to remove any residual flux and other stains, avoiding long-term adhesion of residual chemicals that may affect the performance of the board; when storing, avoid stacking, heavy pressure, and violent collisions, and place in a dry and ventilated environment to extend the service life of the tray.
Beside Durostone CFR767, there are also heva Durostone CAS761(anti-static), Durostone EPM 203,Durostone UPM 203
