PU-Rubber-like-ShoreA A50
Hardness band
A50 = shore A50
Use where A40 is too floppy but a clearly rubbery, low-modulus part is still wanted.
Values for the A50 condition
Other PU-Rubber-like-ShoreA grades and fills
PU-Rubber-like-ShoreA is listed in 7 conditions; see the grade overview at PU-Rubber-like-ShoreA.
Compare all 7 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Shore A40 | Pick for soft-touch skins, squeezable bulbs and gaskets that must feel like soft silicone. | — | 3 | 600 | 9 Shore D |
A50This page Shore A50 | Use where A40 is too floppy but a clearly rubbery, low-modulus part is still wanted. | — | 5 | 520 | 12 Shore D |
Shore A60 | Common choice for grips, bumpers and seals replicating EPDM/TPE over-moulds. | — | 7 | 450 | 16 Shore D |
Translucent / water-clear elastomeric grade | Aliphatic or low-colour elastomeric PU for translucent light guides, soft lenses and clear over-mould mock-ups; slightly lower tear strength and higher cost. | — | 8 | 400 | 22 Shore D |
A70Default Shore A70 | Default all-round rubber-like casting grade: best balance of feel, tear strength and dimensional stability. | — | 9 | 380 | 22 Shore D |
Shore A80 | Choose for stiff seals, wheels, feet and semi-rigid hinges needing high tear resistance. | — | 14 | 340 | 30 Shore D |
Shore A90 | Upper end of the rubber-like range for tough snap features, rollers and impact pads bordering on rigid PU. | — | 20 | 290 | 38 Shore D |
What is PU-Rubber-like-ShoreA A50?
PU-Rubber-like-ShoreA A50 is PU-Rubber-like-ShoreA heat treated to A50 — use where A40 is too floppy but a clearly rubbery, low-modulus part is still wanted. PU-Rubber-like-ShoreA A50 has a tensile strength of 5 MPa (0.653 ksi), weaker than 95% of polyurethane grades. Elongation at break is 520% and the elastic modulus is 0 GPa (5.08×10⁻⁴ Msi). PU-Rubber-like-ShoreA A50 has a density of 1.09 g/cm³ (0.0394 lb/in³), lighter than 76% of polyurethane grades. Its glass-transition temperature is -35°C (-31 °F). A70 is the default condition FabDigit quotes; A50 is available on request or by drawing note.
Advantages
- Forms and bends easily — 92/100, better than 106% of polyurethane grades
- Ductile — tolerates forming and impact — 520%, better than 98% of polyurethane grades
Limitations
- Low stiffness — 0 GPa (5.08×10⁻⁴ Msi), worse than 100% of polyurethane grades
- Difficult to machine — 18/100, worse than 95% of polyurethane grades
- Hard to polish — 25/100, worse than 90% of polyurethane grades
PU-Rubber-like-ShoreA A50 properties
Typical room-temperature values for PU-Rubber-like-ShoreA A50; 16 are specific to this condition. Other listed values are PU-Rubber-like-ShoreA reference data and may not represent this condition. Bars are the position among polyurethane grades.
Physical4
PU-Rubber-like-ShoreA A50 has a density of 1.09 g/cm³ (0.0394 lb/in³), lighter than 76% of polyurethane grades. Its glass-transition temperature is -35°C (-31 °F).
Mechanical8
PU-Rubber-like-ShoreA A50 has a tensile strength of 5 MPa (0.653 ksi), weaker than 95% of polyurethane grades. Elongation at break is 520% and the elastic modulus is 0 GPa (5.08×10⁻⁴ Msi).
Thermal8
PU-Rubber-like-ShoreA A50 is rated for continuous service to 72°C (162 °F). It conducts heat at 0.19 W/m·K (0.11 BTU/hr·ft·°F), worse than 90% of polyurethane grades. Thermal expansion is 180 µm/m·K (100 µin/in·°F).
Electrical5
PU-Rubber-like-ShoreA A50 is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil) and a resistivity of 1×10¹⁰ Ω·m.
Chemical & Environmental3
Corrosion resistance is good (67/100), worse than 95% of polyurethane grades. UV resistance is poor.
Sustainability4
Producing a kilogram of PU-Rubber-like-ShoreA A50 takes about 105 MJ of energy and emits 4.6 kg of CO₂ — more than 64% of polyurethane grades. Typical recycled content is 0%.
Manufacturability6
PU-Rubber-like-ShoreA A50's machinability is poor (18/100, worse than 95% of polyurethane grades); weldability not recommended (0/100); formability excellent (92/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PU-Rubber-like-ShoreA A50
Is PU-Rubber-like-ShoreA easy to machine?
Trim flash with sharp blades or die-cut; milling/drilling smears and tears — freeze or use cryogenic/waterjet cutting for clean edges.
Can PU-Rubber-like-ShoreA be welded?
Thermoset — not weldable; join by PU adhesive, cyanoacrylate or two-shot casting against a previously cured shot.
Can PU-Rubber-like-ShoreA be formed, bent or molded?
Degas both components, mix 1:1-type ratios by weight, vacuum-cast into silicone tools at 60–70 °C; short pot life (2–5 min) and moisture sensitivity demand dry, pre-warmed moulds and post-cure of 4–16 h.
What surface finishes work on PU-Rubber-like-ShoreA?
Colour is best pigmented in the resin; surfaces take the silicone tool texture directly, and only flexible/PU-based paints or flock adhere reliably — no plating or anodising.
PU-Rubber-like-ShoreA 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 |
|---|---|---|
| isocyanate prepolymer (MDI/TDI based)component A | 35 – 55 | 45 |
| chain extender (diol/diamine) | 1 – 6 | 3 |
| catalyst, pigment, UV stabiliser, defoam | 0.5 – 3 | 2 |
| polyol (polyether or polyester)component B; polyester = higher strength/oil resistance, polyether = better hydrolysis resistance | ≥ 40 (balance) | — |
PU-Rubber-like-ShoreA A50 — frequently asked
What is PU-Rubber-like-ShoreA A50 used for?
PU-Rubber-like-ShoreA A50 is typically used for soft-touch grips, gaskets/seals prototypes, overmold simulation and wearable device housings. In short: softest PU casting range; simulates silicone overmoulds; shore 40A–90A on demand.
What is the tensile strength of PU-Rubber-like-ShoreA A50?
PU-Rubber-like-ShoreA A50 has a typical tensile strength of 5 MPa (0.653 ksi) — weaker than 95% of polyurethane grades. Strength varies by condition: see the 7 listed tempers.
Is PU-Rubber-like-ShoreA A50 easy to machine?
Not especially — machinability is rated poor (18/100, worse than 95% of polyurethane grades). Trim flash with sharp blades or die-cut; milling/drilling smears and tears — freeze or use cryogenic/waterjet cutting for clean edges.
Can PU-Rubber-like-ShoreA A50 be welded?
Not readily — weldability is rated not recommended (0/100). Thermoset — not weldable; join by PU adhesive, cyanoacrylate or two-shot casting against a previously cured shot.
What surface finishes work on PU-Rubber-like-ShoreA A50?
Colour is best pigmented in the resin; surfaces take the silicone tool texture directly, and only flexible/PU-based paints or flock adhere reliably — no plating or anodising.
Can PU-Rubber-like-ShoreA A50 be formed, bent or molded?
Degas both components, mix 1:1-type ratios by weight, vacuum-cast into silicone tools at 60–70 °C; short pot life (2–5 min) and moisture sensitivity demand dry, pre-warmed moulds and post-cure of 4–16 h.
What is the maximum service temperature of PU-Rubber-like-ShoreA A50?
PU-Rubber-like-ShoreA A50 is rated for continuous use to about 72°C (162 °F), and briefly to 110°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Axson UP/PX vacuum casting elastomeric polyurethane data sheets — Axson Technologies / Sika (2021)
- Hei-Cast polyurethane casting resin series technical data — H&K / Hei-Cast (2020)
- Smooth-On urethane rubber (Vytaflex / Simpact) technical bulletins — Smooth-On Inc. (2023)
- Engineered Materials Handbook Vol. 2: Engineering Plastics (polyurethane elastomers) — ASM International (1988)
- ASTM D2240 / D412 / D624 — durometer hardness, tension and tear of rubber — ASTM (2021)
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.