PU-Rubber-like-ShoreA
PU-Rubber-like-ShoreA is a flexible two-component polyurethane elastomer cast in hardnesses from Shore 40A to 90A (PX240, PX570) to simulate silicone or rubber over-moulded parts in vacuum casting.
Reference datasheet — PU-Rubber-like-ShoreA is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the A70 condition
PU-Rubber-like-ShoreA grades and fills
PU-Rubber-like-ShoreA is supplied in 7 conditions, soft to hard. A70 is the default FabDigit quotes; the values on this page are for it.
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 | |
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?
PU-Rubber-like-ShoreA is a flexible two-component polyurethane elastomer cast in hardnesses from Shore 40A to 90A (PX240, PX570) to simulate silicone or rubber over-moulded parts in vacuum casting. Typical values are 9 MPa tensile strength, 380 % elongation, Shore D 22, an elastic modulus of about 0.008 GPa and service to 75 °C, so it reproduces soft-touch feel and seal compression in prototypes. Machinability is poor (score 25) and the material is a thermoset, so it cannot be welded or remelted. A translucent condition is available; for production-representative elastomers, move to moulded LSR or TPU. PU-Rubber-like-ShoreA 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). PU-Rubber-like-ShoreA has a tensile strength of 9 MPa (1.31 ksi), weaker than 86% of polyurethane grades. Elongation at break is 380% and the elastic modulus is 0.01 GPa (0.0012 Msi).
What is PU-Rubber-like-ShoreA used for?
- Soft-touch grips
- Gaskets/seals prototypes
- Overmold simulation
- Wearable device housings
Advantages
- Forms and bends easily — 88/100, better than 91% of polyurethane grades
- Ductile — tolerates forming and impact — 380%, better than 88% of polyurethane grades
Limitations
- Difficult to machine — 25/100, worse than 90% of polyurethane grades
- Hard to polish — 25/100, worse than 90% of polyurethane grades
- Low stiffness — 0.01 GPa (0.0012 Msi), worse than 86% of polyurethane grades
PU-Rubber-like-ShoreA properties
Typical room-temperature values for PU-Rubber-like-ShoreA-A70; bars are the position among polyurethane grades.
Physical4
PU-Rubber-like-ShoreA 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 has a tensile strength of 9 MPa (1.31 ksi), weaker than 86% of polyurethane grades. Elongation at break is 380% and the elastic modulus is 0.01 GPa (0.0012 Msi).
Thermal8
PU-Rubber-like-ShoreA is rated for continuous service to 75°C (167 °F). It conducts heat at 0.2 W/m·K (0.116 BTU/hr·ft·°F), worse than 60% of polyurethane grades. Thermal expansion is 180 µm/m·K (100 µin/in·°F).
Electrical5
PU-Rubber-like-ShoreA 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 very good (70/100), worse than 74% of polyurethane grades. UV resistance is poor.
Sustainability4
Producing a kilogram of PU-Rubber-like-ShoreA 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's machinability is poor (25/100, worse than 90% of polyurethane grades); weldability not recommended (0/100); formability excellent (88/100).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the polyurethane family
Yield strength against density for every polyurethane grade FabDigit runs. PU-Rubber-like-ShoreA is highlighted; hover a dot for its name, or open the interactive family chart.
Working with PU-Rubber-like-ShoreA
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.
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) |
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.
Equivalent designations
Standards and trade names that resolve to PU-Rubber-like-ShoreA in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- Elastomeric PU Resin
How much does PU-Rubber-like-ShoreA cost?
PU-Rubber-like-ShoreA is a high-cost polyurethane ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
PU-Rubber-like-ShoreA — frequently asked
What is PU-Rubber-like-ShoreA used for?
PU-Rubber-like-ShoreA 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?
PU-Rubber-like-ShoreA has a typical tensile strength of 9 MPa (1.31 ksi) — weaker than 86% of polyurethane grades. Strength varies by condition: see the 7 listed tempers.
Is PU-Rubber-like-ShoreA easy to machine?
Not especially — machinability is rated poor (25/100, worse than 90% 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 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?
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 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?
PU-Rubber-like-ShoreA is rated for continuous use to about 75°C (167 °F), and briefly to 110°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does PU-Rubber-like-ShoreA cost?
PU-Rubber-like-ShoreA is a high-cost polyurethane ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.