Kraiburg · Thermolast K TC5FTZ (FR2)
A flame-retardant thermoplastic elastomer with a Shore hardness of 50 A – about as yielding as an eraser. The combination of elasticity and flame retardancy is rare in 3D printing; for the FR2 series Kraiburg additionally declares fire classes to the railway standard EN 45545-2.
Rated 1 to 5 relative to the other materials in our range. This is an experience-based orientation aid, not a measured value – the hard numbers are in the table below.
| Property | Value | Source |
|---|---|---|
| Material class | Thermoplastic elastomer (TPE) | grade designation |
| Hardness (DIN ISO 48-4) | 50 Shore A | Kraiburg TDS |
| Density (DIN EN ISO 1183-1) | 1.090 g/cm³ | Kraiburg TDS |
| Tensile strength (ISO 37, S2 at 200 mm/min) | 3.5 MPa | Kraiburg TDS |
| Elongation at break (ISO 37, S2 at 200 mm/min) | 650 % | Kraiburg TDS |
| Tear resistance (DIN ISO 34-1, Graves) | 13.5 N/mm | Kraiburg TDS |
| Compression set, 72 h / 23 °C (DIN ISO 815-1) | 15 % | Kraiburg TDS |
| Compression set, 24 h / 70 °C (DIN ISO 815-1) | 65 % | Kraiburg TDS |
| Fire behaviour (UL 94, 1.5 mm) | V-0 | Kraiburg TDS |
| Railway standard (DIN EN 45545-2) | R22 HL2, R23 HL3, R26 | Kraiburg TDS |
| Glow wire flammability index (IEC 60695-2-12, 2 mm) | 960 °C | Kraiburg TDS |
| Halogen-free (IEC 61249-2-21) | halogen-free | Kraiburg TDS |
| Temperature stability | up to 85 °C | Kraiburg TDS |
| Adhesion | bonds to polypropylene | Kraiburg TDS |
| Colour | black | Kraiburg TDS |
| Drying before processing | 80 °C, 4 – 6 h, residual moisture max. 0.05 % | Kraiburg TDS |
| Shelf life | 24 months in unopened original packaging | Kraiburg TDS |
These values are taken from the manufacturer datasheet and apply to the material, not to the printed part. In 3D printing the achievable properties depend on part orientation, layer height and process parameters – in the Z direction in particular they are lower. Please talk to us before relying on them for design.
“Qualified for functional parts” is a general classification. A functional part can be a simple clip or a main load-bearing member – the forces and load cases differ fundamentally. We therefore always assess in each individual case whether a material is suitable for your part.
Source: KRAIBURG TPE, product information and datasheet THERMOLAST® K TC5FTZ (FR2 series) · retrieved 2026-09-21
Produced on: Bosch pellet printer — More about this machine
We are happy to advise on material selection and to review your part for manufacturability.
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