A Blue Card is an official UL component recognition record under UL Component Recognition. It means the material has been entered into UL’s recognized component system, with a public record that anyone can verify in UL Product iQ. Search QMTC2.E535425 to find Phrozen FR940’s listing directly. Important note: Blue Card recognition applies to the material formulation; it does not mean the final part is automatically compliant. Final parts still require application-level testing based on the actual geometry, thickness, post-processing conditions, and applicable product standard.

Yes. FR940 is compatible with most 405 nm LCD and MSLA printers. For best results, exposure settings should still be fine-tuned based on the printer model, light source intensity, and layer thickness. Most users can achieve stable results within two or three test prints. For Phrozen printers, complete print settings are available for download from the official website.

FR940 is primarily used for functional prototypes that require flame-retardant documentation. The most common applications include electronic housings, power module covers, connector housings, and BMS enclosures. These parts are typically located near power sources, need to meet flame-retardant safety requirements, and maintain a basic level of dimensional accuracy. FR940 offers good rigidity, with a Shore D hardness of 75–80 and a tensile modulus of 1812 MPa, making it suitable for static, load-bearing structural parts. FR940 is a brittle material, so if your part design includes snap fits, flexing of thin walls, or repeated deformation under stress, structural design measures such as thicker walls, added ribs, and avoiding sharp corners and other stress concentration points are recommended to reduce the risk of brittle fracture.

The standard post-processing workflow has two stages. First, wash the part with Phrozen Wash or 95% ethanol for 45–60 seconds. Do not soak it for more than 60 seconds. After washing, let the part rest for 30 minutes, then UV-cure it for 60 minutes. If an HDT of 82.8°C or higher mechanical strength is needed, follow this with thermal curing at 80°C for 2 hours. Even without thermal curing, the flame-retardant properties are already established once UV post-curing is complete.

FR940 has an HDT of 59.8°C at 0.45 MPa (ASTM D648). For continuous use, keeping the actual operating temperature below 55°C is the more conservative approach. It is suitable for applications that stay within that range under normal operating conditions. 

If the part will remain close to battery cells, motors, or other heat sources for extended periods, a more heat-resistant material should be considered. In those cases, the following materials may be more suitable: 

FR940 

• HDT after UV cure: 59.8°C 
• HDT after thermal post-cure: 82.8°C 
• Typical applications: electronic housings, connectors, and BMS enclosures  

PC/GF-Like 

• HDT after UV cure: 65°C 
• HDT after thermal post-cure: 95.6°C 
• Typical applications: medium-temperature structural components  

TR300 

• HDT after UV cure: 65°C 
• HDT after thermal post-cure: 160°C 
• Typical applications: high-temperature functional parts and components used near motors  

Ceramic Pro 

• HDT after UV cure: 181.8°C 
• HDT after thermal post-cure: >230°C 
• Typical applications: molds and extreme-temperature tooling

Both materials carry UL 94 V-0 Blue Card recognition. The main differences fall into three areas: 

• Cost: Phrozen FR940 has a lower material cost, making total prototyping costs easier to control while maintaining the same level of UL 94 V-0 Blue Card recognition.  
• Equipment compatibility: FR940 works with most 405 nm LCD/MSLA printers, while Formlabs FR Resin is primarily used with Formlabs printers.  
• Mechanical performance: Formlabs FR Resin offers higher heat resistance and stronger mechanical performance. If your part requires greater thermal or mechanical performance, Formlabs is a reasonable choice. If you need Blue Card documentation without being tied to proprietary printing hardware, FR940 offers more flexibility.

Not necessarily. FR940’s Blue Card recognition applies to the material formulation only. It does not mean the final part, module, or complete product is automatically covered by the same certification status. For prototyping and sample submission, however, it lets you validate prototypes using a material with verifiable documentation. That helps customer review, procurement, regulatory review, and internal approval move forward more smoothly. It also gives your team a stronger basis for subsequent product validation and material selection.