Clear Rubber-Like · hardness band
Clear Rubber-Like Shore A 70
Properties of the Shore A 70 condition, compared with the other Clear Rubber-Like grades.
Choose when the part must hold shape under load — bumpers, wheels, press-fit seals.
What is Clear Rubber-Like Shore A 70?
Clear Rubber-Like Shore A 70 is Clear Rubber-Like heat treated to Shore A 70 — choose when the part must hold shape under load — bumpers, wheels, press-fit seals. Clear Rubber-Like Shore A 70 has a tensile strength of 7 MPa (0.943 ksi), weaker than 83% of polyurethane grades. Elongation at break is 150% and the elastic modulus is 0.01 GPa (0.0013 Msi). Clear Rubber-Like Shore A 70 has a density of 1.13 g/cm³ (0.0408 lb/in³), lighter than 54% of polyurethane grades. Its glass-transition temperature is -15°C (5 °F). Shore A 60 is the default condition FabDigit quotes; Shore A 70 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 82/100, better than 90% of polyurethane grades
- Ductile — tolerates forming and impact — 150%, better than 78% of polyurethane grades
Limitations
- Difficult to machine — 20/100, worse than 96% of polyurethane grades
- Absorbs moisture — dry before molding — 1.2%, worse than 91% of polyurethane grades
- Low stiffness — 0.01 GPa (0.0013 Msi), worse than 83% of polyurethane grades
- Limited service temperature — 68°C (154 °F), worse than 83% of polyurethane grades
- High mold shrinkage — 0.6%, worse than 75% of polyurethane grades
Clear Rubber-Like Shore A 70 properties
Typical room-temperature values for Clear Rubber-Like Shore A 70 — 8 properties are specific to this condition; the rest are grade-level values shared by every Clear Rubber-Like grade. Each bar shows where the value sits among the polyurethane grades in FabDigit's library — further right is higher.
Physical6
Clear Rubber-Like Shore A 70 has a density of 1.13 g/cm³ (0.0408 lb/in³), lighter than 54% of polyurethane grades. Its glass-transition temperature is -15°C (5 °F).
Mechanical7
Clear Rubber-Like Shore A 70 has a tensile strength of 7 MPa (0.943 ksi), weaker than 83% of polyurethane grades. Elongation at break is 150% and the elastic modulus is 0.01 GPa (0.0013 Msi).
Thermal8
Clear Rubber-Like Shore A 70 is rated for continuous service to 68°C (154 °F). It conducts heat at 0.2 W/m·K (0.116 BTU/hr·ft·°F), worse than 57% of polyurethane grades. Thermal expansion is 180 µm/m·K (100 µin/in·°F).
Electrical6
Clear Rubber-Like Shore A 70 is an electrical insulator with a dielectric strength of 20 kV/mm (508 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 90% of polyurethane grades. UV resistance is poor.
Sustainability4
Producing a kilogram of Clear Rubber-Like Shore A 70 takes about 115 MJ of energy and emits 5.6 kg of CO₂ — more than 89% of polyurethane grades. Typical recycled content is 0%.
Manufacturability3
Clear Rubber-Like Shore A 70's machinability is poor (20/100, worse than 96% of polyurethane grades).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Clear Rubber-Like grades and fills
Clear Rubber-Like is also supplied in 6 other conditions. The full side-by-side table is on the Clear Rubber-Like overview.
- Shore A 60DefaultDefault balance of grip, resilience and tear strength for most rubber-like prototype parts.5 MPa tensile
- Shore A 90The stiffest rubber-like grade; use for snap features, tough housings and parts near a rigid TPU feel.13 MPa tensile
- Shore A 80For living hinges, tough over-mould shells and load-bearing pads needing high tear strength.9 MPa tensile
- Shore A 70Choose when the part must hold shape under load — bumpers, wheels, press-fit seals.7 MPa tensile
- Shore A 50General-purpose stretchy grade for handles, straps, wearables and prototype seals.4 MPa tensile
- Shore A 40Use for flexible bellows, soft grips and gaskets that must conform to rough mating faces.3 MPa tensile
- Shore A 30Pick for soft-touch skins, squeezable bulbs and low-force sealing lips where maximum stretch matters.3 MPa tensile
Working with Clear Rubber-Like Shore A 70
Is Clear Rubber-Like easy to machine?
Essentially unmachinable by conventional tools — trim with sharp blades, die cutting or waterjet; freeze or fixture in wax for any milling.
Can Clear Rubber-Like be welded?
Thermoset — cannot be heat welded; join by cyanoacrylate, UV-cure acrylate adhesive or by printing/casting as one piece.
Can Clear Rubber-Like be formed, bent or molded?
Vat photopolymerization (SLA/DLP/PolyJet) with heavy support on overhangs; thin walls ≥1 mm, allow 0.3–1 % cure shrinkage and post-cure fully to reach quoted Shore and tear values.
What surface finishes work on Clear Rubber-Like?
Clarity comes from a sprayed clear urethane or dip coat rather than sanding; keep parts out of sunlight and store dark to slow yellowing.
Clear Rubber-Like 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 |
|---|---|---|
| aliphatic urethane-acrylate oligomerflexible soft-segment backbone; ratio sets Shore hardness | 45 – 70 | 60 |
| monofunctional/difunctional acrylate dilviscosity control and crosslink density | 25 – 45 | 35 |
| photoinitiator (acyl phosphine oxide typ385/405 nm cure | 0.5 – 3 | 2 |
| stabilizers / UV absorber / optical brigshelf life and clarity | 0.1 – 1.5 | 0.5 |
Clear Rubber-Like Shore A 70 — frequently asked
What is Clear Rubber-Like Shore A 70 used for?
Clear Rubber-Like Shore A 70 is typically used for clear seals, wearables and light diffusers. In short: transparent flexible PU.
What is the tensile strength of Clear Rubber-Like Shore A 70?
Clear Rubber-Like Shore A 70 has a typical tensile strength of 7 MPa (0.943 ksi) — weaker than 83% of polyurethane grades. Strength varies by condition: see the 7 listed tempers.
Is Clear Rubber-Like Shore A 70 easy to machine?
Not especially — machinability is rated poor (20/100, worse than 96% of polyurethane grades). Essentially unmachinable by conventional tools — trim with sharp blades, die cutting or waterjet; freeze or fixture in wax for any milling.
Can Clear Rubber-Like Shore A 70 be welded?
Thermoset — cannot be heat welded; join by cyanoacrylate, UV-cure acrylate adhesive or by printing/casting as one piece.
What surface finishes work on Clear Rubber-Like Shore A 70?
Clarity comes from a sprayed clear urethane or dip coat rather than sanding; keep parts out of sunlight and store dark to slow yellowing.
Can Clear Rubber-Like Shore A 70 be formed, bent or molded?
Vat photopolymerization (SLA/DLP/PolyJet) with heavy support on overhangs; thin walls ≥1 mm, allow 0.3–1 % cure shrinkage and post-cure fully to reach quoted Shore and tear values.
What is the maximum service temperature of Clear Rubber-Like Shore A 70?
Clear Rubber-Like Shore A 70 is rated for continuous use to about 68°C (154 °F), and briefly to 90°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in Clear Rubber-Like Shore A 70?
Yes — Clear Rubber-Like Shore A 70 is available for urethane casting with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Elastic 50A / Flexible 80A photopolymer resin data — Formlabs (2023)
- Agilus30 and Tango family rubber-like PolyJet materials — Stratasys (2023)
- ASTM D412 / D624 / D395 / D2240 (elastomer tensile, tear, compression set, durometer) — ASTM (2021)
- Polyurethane Handbook (property ranges for cast/UV-cured urethane elastomers) — Hanser (1994)
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.