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Water-Washable Resin

What is Water-Washable Resin?

Water-Washable Resin is a photosensitive resin that can be cleaned with water instead of alcohol (IPA). Its core technology lies in incorporating hydrophilic groups or water-soluble components into the formulation, making uncured liquid resin soluble in water. After printing, simply rinse with water or use an ultrasonic water bath to remove surface residue — no large quantities of isopropyl alcohol (IPA) are needed. The post-curing step is identical to that of standard resins.

Traditional UV-curable resins rely on large amounts of IPA for cleaning, which is costly, odorous and flammable. Water-washable resin solves this problem at the formulation level: hydrophilic components allow uncured resin to disperse and dissolve in water, dramatically reducing cleaning costs and safety risks. The low-viscosity formulation also offers easy release and high print success rates, driving rapid growth in the consumer-grade UV-curable market.

Hydrophilic Formulation

Hydrophilic groups or water-soluble components incorporated into the formulation make uncured resin soluble in water, fundamentally eliminating the dependence on IPA.

Water Replaces Alcohol

Simply rinse with water or use an ultrasonic water bath to remove surface residue. The post-curing step is identical to standard resin.

Low Viscosity, Easy Release

Low-viscosity formulation provides good flow and easy release, resulting in high print success rates and shorter resin recovery time between layers.

Safe and Eco-Friendly

Eliminates the need for large quantities of IPA, reducing cleaning costs and flammability risks. No specialized ventilation equipment required, improving the working environment.

Why Water-Washable Resin for 3D Printing?

01No Alcohol Cleaning Needed

Water-washable — simply rinse with water or use an ultrasonic water bath to remove surface residue, eliminating the alcohol cleaning step and improving print efficiency.

02Lower Cleaning Costs

No need to purchase large quantities of IPA. Water alone completes the cleaning, significantly reducing consumable costs over long-term use.

03Safe and Eco-Friendly

Avoids the flammability risks and pungent odor of IPA. No specialized ventilation equipment needed, improving the working environment — ideal for home and education.

04High-Precision Forming

High forming precision with smooth surfaces and excellent detail, meeting the fine-resolution requirements of figurines, jewelry and miniature models.

05Balanced Mechanical Properties

Strength, toughness and rigidity are well balanced, combining model aesthetics with structural reliability.

06Low Viscosity, High Success Rate

Low-viscosity formulation ensures easy release and good flow, resulting in high print success rates and less material waste from failed prints.

07CE Certified

The eSUN water-washable resin series is CE-certified, ensuring reliable quality and meeting global market access requirements.

eSUN and Water-Washable Resin: Material Innovation

eSUN's water-washable resin product line includes three models — W100, W200 and W300 — targeting general-purpose functional parts, low-odor figurine printing and high-precision miniature/dental applications respectively. Together they form a complete water-washable resin matrix spanning entry-level to professional use. The entire series is CE-certified, combining water washability, low viscosity, high precision and balanced mechanical properties.

From IPA Dependence to Water Cleaning Traditional UV-curable resins require large amounts of IPA for cleaning — costly, odorous and flammable — which is the core bottleneck limiting UV printing from reaching home and education settings. By incorporating hydrophilic groups into the formulation, eSUN makes uncured resin soluble in water. A simple water rinse or ultrasonic water bath completes the cleaning, fundamentally solving the IPA dependence problem.
Three Products, Precise Positioning W100 is positioned for general-purpose functional parts with balanced mechanical properties, covering machinery, molds, toys, automotive and electronics. W200 is a low-odor resin for poorly ventilated environments with exceptionally easy cleaning. W300 targets high-precision miniatures and dental applications, with 16K-level precision for lifelike models and dental scan accuracy reaching 99% within 0.1mm deviation.
Full Series CE-Certified W100, W200 and W300 are all CE-certified, sharing the core benefits of water washability, low viscosity, high precision and balanced strength, toughness and rigidity — ensuring reliable quality and global market access.

Pros and Cons of Water-Washable Resin

Pros

Water-Washable, No Alcohol

Clean with water instead of IPA, eliminating the alcohol cleaning step and reducing consumable costs and operational barriers.

Safe and Eco-Friendly

Avoids IPA flammability risks and pungent odor. No specialized ventilation needed — suitable for home and education.

High Precision and Detail

High forming precision with smooth surfaces and excellent detail, meeting the fine-resolution needs of figurines, jewelry and miniatures.

Balanced Mechanical Properties

Strength, toughness and rigidity are well balanced, combining model aesthetics with structural reliability.

Low Viscosity, High Success Rate

Low-viscosity formulation ensures easy release and good flow, resulting in high print success rates and less waste.

Cons

Feature Description Impact
Mechanical properties slightly below standard resin The introduction of hydrophilic components may affect crosslink density to some extent, and some water-washable resins have slightly lower mechanical properties than traditional resins Not suitable for engineering load-bearing parts with extremely high mechanical requirements
Water resistance concerns Hydrophilic formulations may cause moisture absorption and performance degradation under prolonged water exposure or high-humidity environments Not suitable for parts used in long-term immersion or humid environments
Wastewater requires treatment Wash water contains uncured resin and cannot be discharged directly; it requires settling or curing treatment Adds a wastewater treatment step; cannot be discharged like ordinary domestic sewage
Post-curing cannot be skipped Water washing only replaces the cleaning step; the post-curing step is identical to standard resin and UV post-curing is still required to reach final performance UV post-curing equipment is required; the process cannot be simplified

Water-Washable Resin-Derived Materials by eSUN

eSUN's water-washable resin product line includes three models — W100, W200 and W300 — targeting general-purpose functional parts, low-odor figurine printing and high-precision miniature/dental applications. The entire series is CE-certified.

W100 (Water Washable Resin)

W100 is the general-purpose model in eSUN's water-washable resin series. It is water-washable, eliminating the alcohol cleaning step and improving print efficiency. It offers high forming precision with smooth surfaces and excellent detail. Strength, toughness and rigidity are well balanced. The low-viscosity formulation ensures easy release and high print success rates. Suitable for machinery parts, molds, toys, automotive and electronic components.

Water-Washable

Clean with water to complete the process, eliminating the alcohol cleaning step and improving print efficiency.

Low Viscosity

Low-viscosity formulation ensures easy release and good flow, resulting in high print success rates.

Balanced Mechanics

Strength, toughness and rigidity are well balanced, combining aesthetics with reliability.

W200 (Low-Odor Water-Washable Resin)

W200 is eSUN's low-odor water-washable resin, especially suitable for use in poorly ventilated environments. Compared to other water-washable resins, W200 is exceptionally easy to clean — no prolonged soaking or secondary cleaning is required. Suitable for anime figurines, craft ornaments and jewelry making.

Low Odor

Especially suitable for poorly ventilated environments, improving the operating experience.

Extremely Easy to Clean

No prolonged soaking or secondary cleaning required, significantly improving cleaning efficiency.

High Precision

High forming precision with smooth surfaces, suitable for fine-resolution applications like figurines and jewelry.

W300 (16K Water-Washable Resin)

W300 is the high-precision model in eSUN's water-washable resin series, combining high print precision with broad application scenarios. It is especially suitable for printing miniature models, accurately reproducing fine details for lifelike results. It also performs outstandingly in dental applications — printed dental models achieve excellent results, with scan accuracy reaching 99% within 0.1mm deviation.

16K-Level Precision

High print precision accurately reproduces the finest details of miniature models for lifelike results.

Dental-Grade Performance

Outstanding dental model printing, with scan accuracy reaching 99% within 0.1mm deviation.

Broad Application Range

Combines high precision with water-washable convenience, suitable for users needing both precision and water washing.

Series Highlights W100 / W200 / W300 all feature water washability, low viscosity, high precision and balanced strength, toughness and rigidity, and are CE-certified — ensuring reliable quality and meeting global market access requirements.

Industry Applications

Industry Typical Applications Material Value
Education & Makers School STEAM education, maker training, individual creative model printing. Water-washable, low-odor, safe and eco-friendly. No specialized ventilation needed — suitable for classroom and home environments.
Figurines & Crafts Anime figurine prototyping, craft ornaments, miniature models, personalized collectibles. High precision, smooth surface, excellent detail with convenient water washing — ideal for fine figurine production (W200/W300).
Jewelry Making Jewelry design prototypes, wax pattern replacement, custom accessory prototyping. High-precision forming and water-washable convenience shorten the jewelry design validation cycle (W200).
Digital Dentistry Dental model printing, orthodontic models, restorative models. 16K-level precision, with dental scan accuracy reaching 99% within 0.1mm deviation (W300).
Machinery & Automotive Parts Machinery part prototypes, mold validation, automotive functional parts, electronic components. Balanced mechanical properties with water-washable efficiency, suitable for functional part prototype validation (W100).

eSUN Case Studies

Anime Figurines

Using W200 low-odor water-washable resin to print anime figurines and craft ornaments. Safe to operate even in poorly ventilated environments, with exceptionally easy cleaning.

Dental Models

Using W300 16K water-washable resin to print dental models with outstanding results — scan accuracy reaches 99% within 0.1mm deviation.

Machinery Parts

Using W100 water-washable resin to print machinery parts and mold prototypes with balanced mechanical properties. Water washing improves print efficiency.

Base Material Comparison

Compared with: Standard Resin, Dental Resin

Dimension Water-Washable Resin Standard Resin Dental Resin
Cleaning Method Water rinse or ultrasonic water bath, no IPA needed Must use IPA (isopropyl alcohol) for cleaning Requires specialized cleaning agent or IPA
Operating Environment & Safety Low odor, non-flammable, no specialized ventilation needed — suitable for home and education Requires ventilation; IPA is flammable and odorous Requires professional environment with strict compliance
Forming Precision High precision; W300 reaches 16K level, suitable for miniatures and dental models Good precision, suitable for appearance parts and concept prototypes Extremely high precision, designed for stringent dental tolerances
Mechanical Properties Balanced strength, toughness and rigidity; slightly below traditional resin Medium mechanical properties, somewhat brittle Meets dental functional requirements, not for general load-bearing parts
Cost Positioning Medium-low, eliminates IPA consumable costs, consumer-friendly Low, consumer-grade general purpose High, professional dental-grade formulation
Typical Applications Education, figurines, jewelry, dental models, machinery part prototypes Appearance display parts, concept models, figurines Orthodontic models, restorative models, dental functional parts
Key Advantage Water-washable resin replaces IPA with water for cleaning, combining low viscosity, high precision and balanced mechanical properties — offering the lowest operational barrier and best safety and environmental performance among the three resins. As environmental regulations tighten, water-washable resin has become one of the fastest-growing categories in the consumer-grade UV-curable market. W300 further combines water-washable convenience with 16K-level dental precision, expanding the application boundaries of water-washable resin.

Water-Washable Resin Printing Tips

Warning Wastewater from water-washable resin cleaning contains uncured resin and must not be discharged directly. Allow the wastewater to settle and separate solids from liquid, or cure the residual resin in sunlight and dispose of it as solid waste. Additionally, water washing only replaces the cleaning step — post-curing cannot be skipped. Printed parts still require UV post-curing to reach their final mechanical properties. Water-washable resin may absorb moisture under prolonged water exposure or high-humidity conditions, and is not recommended for parts used in long-term immersion.
Parameter / Action Recommended Notes
Layer Thickness 0.025 - 0.05 mm Thinner layers improve detail; W300 recommends thin layers to leverage 16K precision
Bottom Layer Exposure 20 - 40 s Ensures first layers firmly adhere to the build platform
Normal Layer Exposure 4 - 10 s Fine-tune based on light source power and layer thickness; low-viscosity resin may need slightly shorter exposure
Light Source Wavelength 405 nm Compatible with mainstream LCD / DLP / SLA resin printers
Bottom Layers 4 - 8 layers Ensures solid bottom adhesion
Cleaning Method Water rinse / ultrasonic water bath No IPA needed; W200 requires no prolonged soaking or secondary cleaning
Cleaning Time 1 - 5 min Avoid prolonged soaking to prevent water absorption and swelling in fine-detail areas
Post-Curing Time 5 - 15 min UV post-curing cannot be skipped; ensures final mechanical properties are reached
Wastewater Treatment Settling / sunlight curing Wastewater containing uncured resin must not be discharged directly

Settings should be adjusted according to your printer model, light source power and model geometry. This guide does not replace the official parameter sheet for a specific grade.