3D printing in FR42 | Manufacturing Materials

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FR42

Material type: UV-curable resin / photopolymer (for SLA)

FR42 is a UV-curable resin for SLA 3D printing. This environmentally friendly, halogen-free flame-retardant material holds UL-94 V0 certification. It combines excellent toughness with superior accuracy and good surface quality, and is designed for large-format SLA printing.

Process compatibility

SLA

Material Color

Beige

Material advantages

- UL-94 V0 flame retardant certification: meets stringent safety standards for flame resistance.
- Halogen-free and environmentally friendly: safe for use across a range of applications.
- Excellent toughness: elongation at break of 35% and impact strength of 18 J/m.
- Superior accuracy and good surface quality: ideal for detailed, precise parts.
- Large-format SLA compatible: suitable for large-scale printing projects.
- Good dimensional stability: low warpage and reliable mechanical properties.

Material shortcomings

- Low heat resistance: HDT is only 53 °C @ 0.455 MPa, so it is unsuitable for high-temperature applications.
- Moderate mechanical strength: tensile strength (28 MPa) and flexural strength (38 MPa) are relatively low compared with engineering-grade materials.
- Higher viscosity: at 1250 cps @ 30 °C, it is more viscous than many other SLA resins and may require careful handling.
- Limited application scope: best suited to non-structural, aesthetic, or flame-retardant parts rather than load-bearing applications.

Recommended description

FR42 is a flame-retardant, halogen-free UV-curable resin for SLA 3D printing, certified to UL-94 V0 at 2.5 mm thickness. It combines excellent toughness (35% elongation at break), superior accuracy, and good surface quality. It is especially recommended for applications requiring flame retardancy, such as in the home appliance, electronics, and transportation industries. As the first flame-retardant material available for large-format SLA printing, it is ideal for producing large, safe, and detailed parts.

Properties

Name
Density	1.22 g/cm³ @ 25 °C
Critical Exposure (Ec)	25.69 mJ/cm²
Penetration Depth (Dp)	0.119 mm
Exposure for 0.254 mm thickness (E10)	217.2 mJ/cm²
Tensile Strength	28 MPa
Tensile Modulus	1300 MPa
Elongation at Break	35%
Flexural Strength	38 MPa
Flexural Modulus	1300 MPa
Impact Strength	18 J/m
Hardness (Shore D)	79
HDT @ 0.455 MPa	53 °C
HDT @ 1.82 MPa	43 °C
Flame Retardancy (UL-94, 2.5 mm)	V0