RPU TB-0.8
Grade
TB-0.8 = high-density / high-temperature tooling board, 0.7–1.0 g/cm³
Pick for check fixtures, foundry patterns, vacuum-forming and low-run composite layup tools needing 90–150 °C stability.
Values for the TB-0.8 condition
Other RPU grades and fills
RPU is listed in 10 conditions; see the grade overview at RPU.
Compare all 10 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Flame-retardant rigid PU / polyisocyanurate | Pick for building panels, transport and electrical enclosures needing UL 94 V-0 or GB 8624 B1 fire performance. | — | 0.25 | 6 | — |
Rigid closed-cell insulation foam, 30–45 kg/m³ | Pick for thermal insulation of panels, pipes, cold rooms and refrigerators where the lowest λ per unit weight matters. | — | 0.28 | — | — |
Rigid structural pour foam, 0.1–0.3 g/cm³ | Pick for buoyancy blocks, core material, packaging inserts and low-cost model stock needing some load capacity. | — | 2 | 5 | 40 Shore D |
Modelling / tooling board, 0.45–0.60 g/cm³ | Pick for styling models, master patterns and vacuum-forming tools where fast, fine-detail CNC machining is the priority. | — | 9 | — | 62 Shore D |
Integral-skin (self-skinning) rigid foam | Pick for one-shot mouldings that need a tough dense skin over a light core — housings, armrests, medical equipment covers. | — | 10 | 10 | 55 Shore D |
TB-0.8This page High-density / high-temperature tooling board, 0.7–1.0 g/cm³ | Pick for check fixtures, foundry patterns, vacuum-forming and low-run composite layup tools needing 90–150 °C stability. | — | 22 | — | 74 Shore D |
Rigid spray polyurea / polyurethane-urea hybrid | Pick for fast-set, seamless protective linings and abrasion coatings on tanks, decks and concrete where instant cure and toughness are needed. | — | 25 | 20 | 60 Shore D |
Mineral (CaCO₃ / alumina / talc) filled cast RPU | Pick for cost-reduced, low-shrink, high-stiffness cast tools, machine bases and thermally conductive backing masses. | — | 30 | 2 | — |
CastDefault As cast | Pick for solid cast parts, jigs, gauges, potting and machined blocks where full-density stiffness and hardness are needed. | — | 55 | 6 | 80 Shore D |
30% glass-fiber / milled-glass reinforced RIM-SRIM | Pick for stiff, dimensionally stable structural mouldings — body panels, housings, fixture plates — where CTE must be reduced. | — | 70 | 2 | — |
What is RPU TB-0.8?
RPU TB-0.8 is RPU in the TB-0.8 grade — pick for check fixtures, foundry patterns, vacuum-forming and low-run composite layup tools needing 90–150 °C stability. RPU TB-0.8 has a tensile strength of 22 MPa (3.19 ksi), weaker than 71% of polyurethane grades. Elongation at break is 6% and the elastic modulus is 2.4 GPa (0.348 Msi). RPU TB-0.8 has a density of 0.8 g/cm³ (0.0289 lb/in³), lighter than 90% of polyurethane grades. Its glass-transition temperature is 95°C (203 °F). Cast is the default condition FabDigit quotes; TB-0.8 is available on request or by drawing note.
Advantages
- Easy to machine — 90/100, better than 105% of polyurethane grades
- Lightweight — 0.8 g/cm³ (0.0289 lb/in³), better than 90% of polyurethane grades
- High service temperature — 95°C (203 °F), better than 86% of polyurethane grades
- Low moisture uptake — 0.3%, better than 81% of polyurethane grades
Limitations
- Low fracture toughness — 1.3 MPa·√m (1.18 ksi·√in), worse than 90% of polyurethane grades
- Poor heat conductor — 0.14 W/m·K (0.0809 BTU/hr·ft·°F), worse than 90% of polyurethane grades
- Limited ductility — 6%, worse than 83% of polyurethane grades
- High mold shrinkage — 0.9%, worse than 83% of polyurethane grades
RPU TB-0.8 properties
Typical room-temperature values for RPU TB-0.8; 11 are specific to this condition. Other listed values are RPU reference data and may not represent this condition. Bars are the position among polyurethane grades.
Physical4
RPU TB-0.8 has a density of 0.8 g/cm³ (0.0289 lb/in³), lighter than 90% of polyurethane grades. Its glass-transition temperature is 95°C (203 °F).
Mechanical16
RPU TB-0.8 has a tensile strength of 22 MPa (3.19 ksi), weaker than 71% of polyurethane grades. Elongation at break is 6% and the elastic modulus is 2.4 GPa (0.348 Msi).
Thermal10
RPU TB-0.8 is rated for continuous service to 95°C (203 °F). It conducts heat at 0.14 W/m·K (0.0809 BTU/hr·ft·°F), worse than 90% of polyurethane grades. Thermal expansion is 48 µm/m·K (26.7 µin/in·°F).
Electrical7
RPU TB-0.8 is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil) and a resistivity of 1×10¹¹ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 74% of polyurethane grades. UV resistance is poor.
Sustainability4
Producing a kilogram of RPU TB-0.8 takes about 103 MJ of energy and emits 4.6 kg of CO₂ — less than 62% of polyurethane grades. Typical recycled content is 3%.
Manufacturability7
RPU TB-0.8's machinability is excellent (90/100, better than 105% of polyurethane grades); weldability not recommended (5/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with RPU TB-0.8
Is RPU easy to machine?
Machines fast and cleanly with sharp carbide or HSS tooling at high spindle speed and low feed pressure; use dust extraction and a respirator, and seal machined foam faces before painting.
Can RPU be welded?
Not weldable — thermoset; join with PU or epoxy adhesives, or cast in inserts during pour.
Can RPU be formed, bent or molded?
Two-component open pour, closed-mould casting, RIM/SRIM or spray; degas and preheat components, hold mould 40–70 °C, and demould after 20–120 min with full cure at 60–80 °C.
What surface finishes work on RPU?
Sand progressively, fill pinholes with PU putty, then prime and paint; aromatic systems need an aliphatic PU or acrylic topcoat for outdoor colour stability.
RPU chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| polymeric MDI (4,4'-diphenylmethane diisisocyanate component; index typically 105–120 for PU, 200–350 for PIR | 40 – 60 | 50 |
| blowing agent (HFC/HFO, cyclopentane or foamed grades only; 0 for solid cast | 0 – 15 | 4 |
| silicone surfactantcell regulator | 0.5 – 2.5 | 1.5 |
| amine / tin catalyst | 0.3 – 2.5 | 1.2 |
| flame retardant (TCPP / phosphate ester)FR and B1 grades | 0 – 15 | 0 |
| mineral or glass fillerfilled/reinforced variants | 0 – 40 | 0 |
| polyether / polyester polyol (combined psucrose/sorbitol-initiated high-functionality polyol for rigid systems | ≥ 35 (balance) | — |
RPU TB-0.8 — frequently asked
What is RPU TB-0.8 used for?
RPU TB-0.8 is typically used for tooling boards, structural foam cores, rigid insulation panels and model/pattern making. In short: rigid tooling-board polyurethane; wide density and fill range; fast, clean machining.
What is the tensile strength of RPU TB-0.8?
RPU TB-0.8 has a typical tensile strength of 22 MPa (3.19 ksi) — weaker than 71% of polyurethane grades. Strength varies by condition: see the 10 listed tempers.
Is RPU TB-0.8 easy to machine?
Yes — machinability is rated excellent (90/100, better than 105% of polyurethane grades). Machines fast and cleanly with sharp carbide or HSS tooling at high spindle speed and low feed pressure; use dust extraction and a respirator, and seal machined foam faces before painting.
Can RPU TB-0.8 be welded?
Not readily — weldability is rated not recommended (5/100). Not weldable — thermoset; join with PU or epoxy adhesives, or cast in inserts during pour.
What surface finishes work on RPU TB-0.8?
Sand progressively, fill pinholes with PU putty, then prime and paint; aromatic systems need an aliphatic PU or acrylic topcoat for outdoor colour stability.
Can RPU TB-0.8 be formed, bent or molded?
Two-component open pour, closed-mould casting, RIM/SRIM or spray; degas and preheat components, hold mould 40–70 °C, and demould after 20–120 min with full cure at 60–80 °C.
What is the maximum service temperature of RPU TB-0.8?
RPU TB-0.8 is rated for continuous use to about 95°C (203 °F), and briefly to 130°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASTM D1622 / D1621 — Density and Compressive Properties of Rigid Cellular Plastics — ASTM (2020)
- EN 14315-1 — In-situ formed sprayed rigid polyurethane foam products — CEN (2013)
- Engineered Materials Handbook Vol.2 — Engineering Plastics (Polyurethanes) — ASM International (1988)
- Rigid polyurethane systems and tooling board technical data — Huntsman / Covestro / RAMPF / Sika Axson (2023)
- CES/Ashby polymer property records — rigid PU foam and cast PU — Granta Design (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.