QTS Flex 52D Slow Rebound Resin (Clear), Taiwan R&D & manufactured. Shore 52D memory foam-like viscoelastic behavior, notched impact strength 40~50 J/m, elongation >100%, ultra-low viscosity 140~180 cps. Energy absorbing, slow recovery like memory foam. Perfect for precision instrument damping feet

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🏆 QTS Technology — Taiwan-Based R&D & Manufacturing

30+Years Chemical Background

15+Years 3D Printing Experience

8000+Taiwan Customers

100%Made in Taiwan

QTS Technology brings 30+ years of chemical R&D expertise to 3D printing materials.
All resins are developed and manufactured in Taiwan with strict quality control, trusted by 8000+ customers.

QTS Flex 52D Slow Rebound Resin (Clear)

Memory Foam Effect × Energy Absorbing × High Toughness × Crystal Clear × Made in Taiwan

Shore 52D (Slow Rebound) 40~50 J/m Impact Strength >100% Elongation 140~180 cps Ultra-Low Viscosity Crystal Clear Made in Taiwan 405nm Compatible

52D Shore Hardness

Hard plastic-grade with slow rebound behavior

40~50 J/m Notched Impact

High toughness, no brittle fracture

>100% Elongation at Break

Tough yet flexible, bend without breaking

140~180 cps Viscosity (Ultra-Low)

Excellent flowability, easy to process

🔬 Slow Rebound (Memory Foam) Mechanism

🟦

① Original State

Shore 52D hardness, crystal clear, structurally stable

💥

② Impact Applied

External force applied, material begins absorbing impact energy

🌊

③ Slow Recovery

Impact energy converted to heat, slowly released — like memory foam

✅

④ Full Recovery

Gradually returns to original shape, reusable

This "Viscoelastic" behavior is the core soul of Flex 52D — a unique advantage that ordinary elastic resins cannot replicate

💎 Four Unique Characteristics of Flex 52D

🌊 Slow Rebound (Memory) Behavior — Core Identity

This is Flex 52D's core value — an extremely rare characteristic in photopolymer resins. Unlike ordinary elastomers that spring back immediately, it converts impact force to heat and releases it slowly. The perfect material for high-end vibration dampers, energy-absorbing pads, or mechanisms requiring slow return.

⚡ Perfect Balance of Rigidity & Toughness

Shore 52D hardness provides solid structural support, while >100% elongation and 40~50 J/m impact strength ensure tough deformation rather than brittle fracture under load. Ideal for clips, hinges, and fixtures requiring both structural strength and flexibility.

🔍 Optical Clarity — Visualize Everything

Crystal clear transparency lets you observe stress distribution and slow rebound deformation inside parts — an indispensable validation tool for academic research and product development. Directly verify that slow rebound behavior matches design intent.

💧 Ultra-Low Viscosity — 140~180 cps

Ultra-low viscosity of only 140~180 cps gives this high-performance material excellent flowability. High print success rates, sharp model details, and effortless post-processing cleaning. High performance, most user-friendly processing experience.

✨ Six Core Advantages

🌊

Globally Rare Slow Rebound Property

Extremely rare "Viscoelastic" behavior in photopolymer resins. Memory foam-like energy absorption and slow release brings unprecedented vibration damping applications to 3D printing — a unique advantage competitors cannot replicate.

💪

High Toughness — 40~50 J/m Impact Strength

Notched impact strength of 40~50 J/m combined with >100% elongation ensures tough deformation rather than brittle fracture under extreme impact. Ideal for high-toughness clips, hinges, and fixtures.

🔍

Crystal Clear — Visual Validation

Crystal clear transparency lets you observe stress distribution and slow rebound deformation — an indispensable tool for academic research, product development, and functional validation.

⚖️

Shore 52D — Rigid Yet Tough

Hard plastic-grade Shore 52D hardness provides solid structural support while maintaining >100% elongation — achieving the perfect "rigid yet tough" mechanical characteristic balancing structural strength and deformation capability.

💧

Ultra-Low Viscosity — 140~180 cps

Ultra-low viscosity ensures fast resin flow and fine detail filling, significantly improving print success rates and making post-processing cleaning effortless. High performance with the most user-friendly processing experience.

🇹🇼

Taiwan R&D & Manufacturing

100% Taiwan-developed and manufactured with strict quality control. QTS Technology's 30+ years of chemical expertise, trusted by 8000+ customers. Flex 52D's slow rebound is QTS's exclusive formula achievement.

🎯 Eight Core Application Areas

🎵

Precision Instrument & Audio Equipment Damping Feet

Custom vibration damping feet for precision measurement instruments, audio equipment, and optical devices. Slow rebound ensures vibration energy is fully absorbed rather than reflected, effectively isolating external vibrations to improve measurement accuracy and audio quality.

🏃

Sports Protective Gear High-End Cushioning

High-end cushioning inner layers for helmets, knee pads, and elbow guards. Shore 52D slow rebound fully absorbs impact energy, providing superior protection compared to ordinary elastomers. Clear appearance facilitates design validation.

🔗

High-Toughness Clips & Hinges (Joints)

Clips, hinges, and fixtures requiring repeated opening/closing without fracture. >100% elongation and 40~50 J/m impact strength ensure long-term fatigue resistance — the ultimate material for functional clips and living hinges.

🔧

Sealing Gaskets & Custom Washers

Custom gaskets requiring structural strength combined with excellent sealing performance. Shore 52D hardness provides sufficient structural support while slow rebound ensures tight sealing surface contact for various industrial sealing applications.

🔬

Viscoelastic Functional Prototypes

Prototypes for any application requiring "slow rebound" or "viscoelastic" behavior simulation. Transparent appearance allows direct observation and validation of slow rebound behavior — ideal for academic research and new material development.

🤖

Soft Robotics & Wearable Devices

Joint and actuator prototypes for soft robotics; cushioning structures for wearable devices. Slow rebound behavior simulates biological tissue viscoelasticity — ideal for biomimetic design applications.

🎮

Consumer Electronics Cushioning Structures

Cushioning structure prototypes for phone cases, earphones, and game controllers. Slow rebound provides superior drop protection; transparent appearance lets designers directly evaluate cushioning structure effectiveness.

🏭

Industrial Buffering & Vibration Damping

Buffer stops, damping pads, and anti-vibration mounts for industrial equipment. Slow rebound ensures lasting protection under repeated impacts; Shore 52D hardness provides sufficient structural strength for various industrial buffering scenarios.

📊 Complete Technical Specifications

Photopolymer Resin Basic Properties (Liquid Material)

Test Item	Value	Test Method
Appearance	Flowable Liquid	Visual
Color	Clear (Transparent)	Visual
Viscosity @25°C	140 ~ 180 cps (Ultra-Low)	Viscometer
Wavelength	395 ~ 405 nm	—
Volume	500 g	—

Mechanical Properties After Curing

Test Item	Value	Test Method
Shore Hardness D	52 D (Hard plastic-grade with slow rebound)	ASTM D2240
Notched Izod Impact Strength	40 ~ 50 J/m (High toughness)	ASTM D256
Elongation at Break	>100% (Rigid yet tough)	ASTM D638
Tensile Strength	2.7 MPa	ASTM D638
Print Technology	LCD / DLP / SLA	—

📌 Understanding Shore 52D:
Shore D hardness measures harder materials (hard rubber, rigid plastics). Shore 52D corresponds to hard plastic hardness range (similar to hard PVC, rigid rubber). What makes Flex 52D extraordinary: it has hard plastic hardness while simultaneously exhibiting >100% elongation and slow rebound behavior — a combination virtually non-existent in traditional materials, representing a breakthrough in photopolymer technology.

⚙️ Recommended Exposure Parameters

⚠️ Flex 52D Critical Note: Slow rebound properties are highly sensitive to post-cure time. Over-curing will reduce slow rebound effect, making the material behave like ordinary hard resin. Strictly control post-cure time within 10~30 minutes to preserve optimal slow rebound characteristics.

Printer Model	Screen Type	Bottom Exposure	Normal Layer Exposure	Layer Height
Phrozen Make	Color-LCD	35 ~ 45 sec	8 ~ 11 sec	50 μm
Phrozen Sonic mini	Mono-LCD	25 ~ 35 sec	4 ~ 6 sec	50 μm
Miicraft 125	DLP	9 ~ 12 sec	0.9 ~ 1.2 sec	50 μm

📋 Usage Steps

Shake the Resin

Shake thoroughly before use. Flex 52D has ultra-low viscosity (140~180 cps) — excellent flowability at room temperature, no warming required.

Set Print Parameters

Use recommended exposure parameters above. Flex 52D's ultra-low viscosity enables fast detail filling with high print success rates. Clear resin has good light penetration — avoid over-exposure.

Remove Print

Flex 52D has good toughness — use a thin spatula to assist removal. Clear appearance lets you observe model integrity before removal.

Wash

Wash with 95% Alcohol or IPA or dedicated cleaning solution, gently agitate for 1~2 minutes. Ultra-low viscosity makes cleaning easier — residual resin removed more readily, helping maintain crystal clear appearance.

Post-Cure (Critical Step — Time Control is Key)

Post-cure using a UV curing station (365~405nm) for 10~30 minutes (adjust based on model thickness). ⚠️ Critical: Flex 52D's slow rebound properties are highly sensitive to post-cure time. Excessive post-curing significantly reduces slow rebound effect. Strictly keep within 30 minutes.

📊 Flex 52D vs Standard Elastic Resin vs Traditional Memory Foam vs Hard Resin

Comparison	QTS Flex 52D	Standard Elastic Resin	Traditional Memory Foam	Standard Hard Resin
Slow Rebound	✅ Unique Slow Rebound ⭐⭐⭐	❌ Fast rebound	✅ Slow rebound	❌ No elasticity
Print Precision	Ultra-High (Photopolymer) ⭐⭐⭐	Ultra-High (Photopolymer)	Cannot 3D print	Ultra-High (Photopolymer)
Transparency	Crystal Clear ✅	Depends on color	Opaque	Depends on color
Toughness (Elongation)	>100% ✅	50~700%	High	<10%
Structural Strength	Shore 52D (Hard) ✅	Shore 8~85A (Soft)	Low	Shore 70~90D (Hard)
Custom Geometry	✅ Any complex shape	✅ Any complex shape	❌ Difficult to customize	✅ Any complex shape
Taiwan Local Support	✅ QTS Professional	Depends on brand	—	Depends on brand

❓ Frequently Asked Questions

Q: What is "slow rebound"? How slow is Flex 52D's recovery?

A: Slow rebound means the material doesn't spring back immediately after compression or impact like ordinary elastomers — instead it slowly recovers its original shape. This stems from the material's "viscoelastic" behavior, similar to memory foam. Flex 52D's recovery speed depends on post-cure time and model thickness, typically recovering slowly over several seconds to tens of seconds.

Q: What's the difference between Shore 52D and the Shore A values in the Flex series?

A: Shore A and Shore D are two different hardness measurement scales. Shore A measures softer rubbers and elastomers (Flex 8A~85A); Shore D measures harder materials (hard rubber, rigid plastics). Shore 52D corresponds to hard plastic hardness — much harder than Shore 85A. What makes Flex 52D special: it has hard plastic hardness while simultaneously exhibiting slow rebound behavior and >100% elongation.

Q: How significantly does post-cure time affect slow rebound performance?

A: Very significantly. Longer post-cure time pushes the material toward ordinary hard resin with weaker slow rebound effect. Strictly control post-cure time within 10~30 minutes to preserve optimal slow rebound characteristics. For stronger slow rebound, try shorter post-cure time (but not below 10 minutes — surface may remain tacky).

Q: Can it be used for sports protective gear cushioning?

A: Yes, Flex 52D is excellent for sports protective gear cushioning prototyping and small-batch production. Slow rebound fully absorbs impact energy, providing superior protection compared to ordinary elastomers. Clear appearance lets designers directly evaluate cushioning structure effectiveness.

Q: What's the fundamental difference between Flex 52D and the Flex series (Flex 8A~85A)?

A: The fundamental differences are "rebound speed" and "hardness scale." Flex 8A~85A uses Shore A scale — soft elastomers that spring back quickly after loading; Flex 52D uses Shore D scale — hard material with slow rebound (viscoelastic) behavior. Choose Flex series for fast-rebounding soft materials; choose Flex 52D for energy-absorbing, slow-recovering hard materials.

Q: What practical advantages does the clear appearance offer?

A: Clear appearance brings multiple practical advantages: 1) Visual validation — directly observe if slow rebound behavior matches design intent; 2) Stress distribution observation — observe internal stress distribution under load; 3) Academic research — visualized experiments in materials mechanics; 4) Design aesthetics — transparency itself is a design language, suitable for consumer electronics and premium design.

Q: Which 3D printers is this resin compatible with?

A: QTS Flex 52D is compatible with all 405nm light source LCD/DLP/SLA 3D printers, including Phrozen, Anycubic, Elegoo, Creality, FlashForge, eSUN, Miicraft, and other mainstream brands.

🏆 Why Choose QTS Technology?

🧪 Taiwan R&D & Manufacturing

QTS brings 30+ years of chemical expertise. Flex 52D's slow rebound behavior is QTS's exclusive formula achievement, developed and manufactured entirely in Taiwan.

🔧 Professional Technical Support

Complete printing parameter guidance and troubleshooting — especially precise post-cure time control for Flex 52D to help you achieve optimal slow rebound performance.

🖨️ Universal Printer Compatibility

Compatible with all 405nm printers including Phrozen, Anycubic, Elegoo, Creality, FlashForge, and Miicraft.

🛡️ Trusted by 8000+ Customers

Long-term trust from 8000+ Taiwan customers spanning designers, engineers, research institutions, and manufacturers across industries.

🌊 Experience Flex 52D — The "Memory Foam" of 3D Printing!

Made in Taiwan × Shore 52D Slow Rebound × Energy Absorbing × Crystal Clear

📧 Technical Support: info@qts.tw ｜ 🌐 Official Store: shop.qts.tw

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