SLA Resin · Elastomeric

SLA Flexible 80A Rubber-Like Resin 3D Printing

Name: SLA Flexible 80A Rubber-Like Resin 3D Printing
Brand: RYSE 3D

A true elastomer for stereolithography — Shore A 83, 230% elongation at break and 28 kN/m tear strength. Flexible 80A resin 3D printing gives you the look, feel and function of an 80A cast urethane or hard rubber, without a mould and without a tooling lead time. RYSE 3D prints it on the Formlabs Form 4L in Shipston-on-Stour — gaskets, seals, soft-jaw jigs, grips and shock-absorbing bumpers, from one part to a production batch.

Quote in Flexible 80A → All SLA resins Flexible 80A datasheet (PDF) ↓

Also known as flexible resin · rubber-like resin · elastomeric SLA resin · 80A soft resin · cast urethane alternative · soft-touch 3D printing resin

Overview

A genuine elastomer, printed not moulded

Most flexible 3D printing sits in an awkward middle ground — bendy, but not really rubber. Flexible 80A is different. It is formulated to rival 80A cast urethanes, TPUs and hard rubbers, and it behaves like them: parts stretch to more than twice their length before failing, snap back into shape, and survive repeated bending, tension and compression rather than taking a permanent set on the first cycle.

That makes it the right call for anything that has to seal, cushion, grip or conform. A gasket that has to sit in a groove and stay there. A soft jaw that has to hold a machined component without marking it. A bumper that takes a knock and recovers. Because it is printed rather than moulded, there is no tool to pay for and no tool to wait for — geometry that would need a complex multi-part mould in silicone comes off the machine in a single piece, and a design change costs a re-slice rather than a re-cut.

The trade is thermal. Flexible 80A is an ambient-temperature material with a glass transition at −49 °C, and its compression set climbs sharply with heat. It is specified for handling, sealing and cushioning at room temperature, not for hot service — the honest limits below set out exactly where it stops.

Technical data

Flexible 80A material properties

Headline properties for our SLA Flexible 80A elastomeric resin, post-cured.

Reviewed by the RYSE 3D engineering team · August 2026. Figures from the manufacturer's technical data sheet (V2). Elastomer values are quoted to ASTM D412 and D624 and cannot be ranked against rigid tensile figures. Values vary with geometry and orientation.

Property	Value	Method
Shore A hardness	83	ASTM D2240
Ultimate tensile strength	10.0 MPa	ASTM D412-16
Elongation at break	230%	ASTM D412-16
Tear strength	28 kN/m	ASTM D624-00
Compression set (23 °C, 22 h)	32%	ASTM D395-03 (B)
Bayshore resilience	58%	ASTM D2632
Glass transition (Tg)	−49 °C	DMA, tension mode
Colour	Black	—

Download Flexible 80A datasheet (PDF) ↓

Applications

What flexible 80A resin is used for

Where a part has to seal, grip, cushion or conform — and a mould is not worth cutting.

SLA Flexible 80A rubber-like resin 3D printed seals and gaskets

Seals and gaskets — conforming to the mating face

SLA Flexible 80A rubber-like resin 3D printed soft-touch grip component

Soft-touch grip — moulded-feel handle surface

SLA Flexible 80A rubber-like resin 3D printed soft jaw fixture protecting a finished component

Soft-jaw fixture — protecting a finished surface

Gaskets & sealsSoft jaws & fixture insertsGrips & handle overlaysShock-absorbing bumpersVibration pads & isolatorsCustom covers & bootsCast-urethane prototypesWearable & ergonomic mock-upsProtective inserts & trays

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Why Flexible 80A

Why choose flexible 80A resin

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Rubber-like at 83 Shore A

Measured at 83 Shore A post-cured (ASTM D2240) — firm rubber territory, the same hand-feel as an 80A cast urethane rather than a soft gel.

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Stretches past twice its length

230% elongation at break to ASTM D412-16. Parts deform, recover and go back on rather than tearing off during fitting.

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Tear resistance that survives fitting

28 kN/m to ASTM D624-00 — the figure that decides whether a thin gasket lip survives being stretched over a flange.

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Snaps back, doesn't sag

58% Bayshore resilience and 32% compression set at room temperature — it returns to shape after load instead of staying squashed.

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No mould, no tooling wait

Geometry that would need a multi-part silicone mould prints in one piece. Design changes cost a re-slice, not a re-cut.

●

Flexes repeatedly without failing

Ross flex fatigue of 2,808 cycles at 23 °C and 37,619 cycles at −10 °C (ASTM D1052) — quantified flex life, not a marketing claim.

Design guidance

Designing for flexible 80A resin

Elastomeric SLA behaves differently from a rigid resin. These are the guidelines we work to on the Form 4L — we'll confirm the specifics for your part with a free design-for-additive review at quote.

Design feature	Typical guideline
Build envelope (Form 4L)	353 × 196 × 350 mm
Layer thickness	100 microns is the standard setting for this resin
Wall thickness	Thicker than a rigid resin — thin unsupported sections tear during support removal. Send the CAD and we'll advise a minimum for your geometry.
Tolerance	Elastomeric parts relax after cure, so dimensional tolerance is confirmed per part at quote rather than quoted as a blanket figure
Supports	Required, and they touch the part. Soft material shows witness marks more than a rigid resin does — tell us which faces are sealing or cosmetic
Orientation	We orient in PreForm to keep supports off sealing faces and to avoid peel forces stretching thin flexible sections
Sealing faces	Design a defined lip or bead rather than relying on a flat face — a compressible bead seals far more reliably on a printed part
Service temperature	Ambient only. Compression set rises from 32% at 23 °C to 85% at 70 °C — a hot static seal will take a permanent set
Post-cure	Hardness and strength both come from post-cure. Green parts measure 68 Shore A and 4.0 MPa; fully post-cured parts reach 83 Shore A and 10.0 MPa
Finish	Matte black as printed. Flexible resin does not sand or paint like a rigid part — plan the geometry to be right off the machine

Our SLA platform

Printed on the Formlabs Form 4L in open mode

Every Flexible 80A part we ship is printed on the Formlabs Form 4L, washed on the Form Wash L and post-cured on the Form Cure L — print, wash, cure and finish all in-house, so nothing leaves the building between the CAD and the finished part. Build envelope is 353 × 196 × 350 mm, large enough for a full-size gasket, boot or cover in a single piece rather than split and bonded.

We run the Form 4L in open mode, which means we are not restricted to a single supplier's resin range. That is what lets us offer a true elastomeric grade like Flexible 80A alongside the rest of our resin range, and choose the right resin for your part rather than the one the machine came with.

Formlabs Form 4L SLA 3D printer with a large printed part on the build platform, the stereolithography process used for Flexible 80A resin at RYSE 3D — A large-format build coming off the Form 4L platform.

PreForm build layout showing an SLA part oriented and supported inside the Formlabs Form 4L build volume at RYSE 3D — The same job in PreForm — oriented and supported before it prints.

Formlabs Form 4L printer with Form Wash L and Form Cure L post-processing stations used for flexible resin parts at RYSE 3D — Print, wash and cure — the full SLA workflow under one roof.

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Full data

Flexible 80A full technical data

Green and post-cured values from the manufacturer's technical data sheet (V2), with the test method quoted against every figure. Post-cured is the condition every part we ship is delivered in.

Property	Green	Post-cured	Method
Shore A hardness	68	83	ASTM D2240
Ultimate tensile strength	4.0 MPa	10.0 MPa	ASTM D412-16
Stress at 50% elongation	1.5 MPa	2.9 MPa	ASTM D412-16
Stress at 100% elongation	2.3 MPa	4.7 MPa	ASTM D412-16
Stress at 200% elongation	3.8 MPa	8.6 MPa	ASTM D412-16
Elongation at break	210%	230%	ASTM D412-16
Tear strength	11 kN/m	28 kN/m	ASTM D624-00
Compression set (23 °C, 22 h)	Not tested	32%	ASTM D395-03 (B)
Compression set (70 °C, 22 h)	Not tested	85%	ASTM D395-03 (B)
Pendulum rebound (Schob type)	Not tested	56%	ASTM D7121
Bayshore resilience	Not tested	58%	ASTM D2632
Ross flex fatigue at 23 °C	2,808 cycles	2,808 cycles	ASTM D1052
Ross flex fatigue at −10 °C	37,619 cycles	37,619 cycles	ASTM D1052
Glass transition (Tg)	Not tested	−49 °C	DMA, tension mode
Solid density	1.09 g/cm³		ASTM D792-20

Tensile testing to ASTM D412 used a Die C specimen at a 500 mm/min pull rate; tear testing used a directly printed Die C tear specimen at the same rate. Ross flex fatigue was run at 90° deflection, notched, at 100 cycles/min with no initial heat ageing. No heat deflection temperature is published for this resin — the glass transition figure above is the only thermal value on the datasheet, and it is a cold-side transition, not a service ceiling. Elastomer figures quoted to ASTM D412 and D624 are not comparable with rigid tensile figures quoted to ASTM D638 or ISO 527, or with notched impact figures from any process.

Accelerated heat ageing to ASTM D3045 (six weeks at 50 °C, interpreted by the standard as roughly one year at ambient) and indoor UV ageing to ASTM D4459 have both been evaluated for this resin. Ask us for the ageing curves if long-term property retention matters for your part.

Honest limits

Where flexible 80A resin is the wrong call

Flexible 80A buys you rubber behaviour without a mould. It is not a hot material, not a strong one and not a chemical-resistant one. These are the cases where something else wins — told straight, so you don't find out after the first batch.

Hot static seals

Compression set rises from 32% at 23 °C to 85% at 70 °C (ASTM D395-03 B). A gasket held compressed at temperature will take a near-permanent set and stop sealing. For a warm sealing application, a moulded elastomer or SLS TPU 90A is the safer specification.

Any sustained heat at all

There is no published heat deflection temperature for this resin — the only thermal figure is a −49 °C glass transition. Treat it as an ambient material. Anything near a motor, power supply or engine bay wants PET-CF at 205 °C or PPA-CF at 192 °C.

Solvent contact

Chemical testing to ASTM D471 shows heavy swelling in acetone, ethanol, IPA and xylene — over 100% volume change in a day, with hardness dropping by tens of Shore A points. It holds up far better in motor oil and IRM reference oils. Tell us the fluid at quote and we'll tell you honestly whether it survives.

Carrying load

10 MPa tensile is an elastomer figure, not an engineering one. Nothing here should be taking load or holding alignment — that is a job for PA6-CF at 109 MPa or SLS PA12.

High-volume flexible parts

SLA needs supports on every part and hand finishing after. For flexible parts in real quantity, SLS TPU 90A nests in the powder bed with no supports at all and scales far better — same rubber behaviour, different economics.

Outdoor and UV exposure

The published ageing data covers indoor xenon-arc exposure to ASTM D4459 — light through glass, not direct weathering. There is no outdoor weathering data for this resin, so we won't specify it for exterior service. For UV-stable outdoor parts, FDM ASA is the grade built for it.

Compare

SLA Flexible 80A vs SLS TPU 90A vs SLA Black PU

Two questions decide this one. First, how soft does the part actually need to be — if it only has to flex rather than seal or cushion, SLA Black PU is tougher and stronger while still being ductile. Second, how many do you need — for flexible parts at volume, SLS TPU 90A prints without supports and scales better. Full range on all 3D printing materials.

Property	Flexible 80A (this page)	SLS TPU 90A	SLA Black PU
Process	SLA	SLS	SLA
Character	True elastomer, rubber-like	True elastomer, firmer	Tough but rigid
Hardness	83 Shore A (ASTM D2240)	90 Shore A	Rigid — not measured on the Shore A scale
Elongation at break	230% (ASTM D412-16)	See TPU 90A page	79%
Ultimate tensile strength	10.0 MPa (ASTM D412-16)	See TPU 90A page	40 MPa
Tear strength	28 kN/m (ASTM D624-00)	See TPU 90A page	Not applicable
Supports required	Yes	No	Yes
Surface finish	Smooth, fine detail	Matte, grainy	Smooth, fine detail
Scales to volume	Moderate	Strong — nests in the powder bed	Moderate
Best for	Seals, gaskets, grips, soft jaws, cushioning	Flexible parts in quantity	Detail plus handling toughness

Note: elastomer figures on this page are quoted to ASTM D412 and D624. Black PU tensile is a rigid-resin figure to a different method, and SLS grades are quoted to different standards again — these are indicative of family, not a like-for-like ranking. Where a cell reads "see TPU 90A page", the figure is published there against its own test method rather than restated here out of context.

SLA

All SLA Resins

Tough, clear, flexible, high-temp, flame-retardant and ESD resins.

See SLA resins → SLS

SLS TPU 90A

Flexible elastomer parts at volume, printed without supports.

See TPU 90A → All

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Every material across SLS, MJF, FDM and SLA.

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FAQ

SLA Flexible 80A FAQ

What is flexible 80A resin?

Flexible 80A is an elastomeric SLA resin formulated to rival 80A cast urethanes, TPUs and hard rubbers. Parts stretch, compress and snap back rather than cracking. RYSE 3D prints it on the Formlabs Form 4L, and post-cured parts measure 83 Shore A with 10.0 MPa tensile strength, 230% elongation at break and 28 kN/m tear strength.

How soft is flexible 80A resin?

Post-cured parts measure 83 Shore A to ASTM D2240 — firm rubber, roughly the feel of a shoe sole or a heavy-duty seal, not a soft squishy gel. Green parts straight off the printer measure 68 Shore A; the hardness comes up during post-cure, which is why every part we ship is fully cured before it leaves.

Is flexible 80A resin the same as rubber?

It behaves like one. It is a photopolymer, not a vulcanised rubber, but it is formulated to match the look, feel and function of an 80A cast urethane or hard rubber — and the published figures are quoted to the same rubber test standards (ASTM D412 for tensile, D624 for tear, D395 for compression set, D2240 for hardness). The main practical difference from moulded rubber is heat: compression set rises steeply above room temperature.

Can you 3D print gaskets and seals in the UK?

Yes. Flexible 80A is the grade we use for printed gaskets, seals, boots and covers, printed and finished in-house in Shipston-on-Stour and shipped UK-wide. Design a defined lip or compressible bead rather than a flat sealing face, keep the service temperature at ambient, and tell us any fluid the part will contact so we can check compatibility before you commit.

How strong is flexible 80A resin?

10.0 MPa ultimate tensile strength to ASTM D412-16, with 230% elongation at break and 28 kN/m tear strength to ASTM D624-00. Those are elastomer figures and should not be compared against rigid materials — the point of Flexible 80A is that it stretches and recovers, not that it carries load. For load-carrying parts use PA6-CF or SLS PA12 instead.

What is flexible 80A resin used for?

Gaskets and seals, soft jaws and fixture inserts that protect finished components, grips and handle overlays, shock-absorbing bumpers, vibration pads, custom covers and boots, cast-urethane prototypes, wearable and ergonomic mock-ups, and protective inserts and trays.

How heat resistant is flexible 80A resin?

It isn't. No heat deflection temperature is published for this resin — the only thermal figure on the datasheet is a −49 °C glass transition, which is a cold-side transition rather than a service ceiling. Compression set rises from 32% at 23 °C to 85% at 70 °C, so a compressed seal at temperature will take a permanent set. Specify it for ambient service only.

Should I choose SLA Flexible 80A or SLS TPU 90A?

Choose on quantity and finish. Flexible 80A gives a smoother surface, finer detail and a softer 83 Shore A feel, so it wins on sealing faces, cosmetic parts and one-offs. SLS TPU 90A is firmer at 90 Shore A but prints with no supports at all and nests in the powder bed, so it scales far better for flexible parts in real quantity. Send the CAD and the batch size and we'll recommend one.

What machine do you print SLA on?

The Formlabs Form 4L, with a 353 × 196 × 350 mm build envelope, running in open mode so we are not tied to one supplier's resin range. Parts are laid out and supported in PreForm, washed on the Form Wash L and post-cured on the Form Cure L, then supports are removed and the part finished by hand — all in-house in Shipston-on-Stour.

How do I order flexible 80A resin parts in the UK?

Upload your CAD to our instant online quote and select SLA Flexible 80A. As a UK 3D printing service bureau we print, finish and inspect every part in-house in Shipston-on-Stour, Warwickshire, and ship UK-wide — from a single prototype seal through to a production batch.

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Upload your CAD for an instant online quote in SLA Flexible 80A rubber-like resin — gaskets, seals, grips and soft jaws, from one part to a production batch. Printed and finished in the UK.

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Printed and finished at our own ISO 9001 facility in Shipston-on-Stour, Warwickshire. Call us on 024 7736 0144.