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SL-UV HTR250 High Heat-Resistant UV-curing Resin
SL-UV HTR250 高耐熱性紫外線硬化樹脂
SL-UV HTR250 高耐熱性紫外線硬化樹脂Stereolithography (SLA) is a method of 3D-printing that specializes in a low-cost, high-precision fabrication of complex forms in a minimal number of steps. Compared to materials used for other fabrication techniques,  the conventional UV-curing epoxy resin used in SLA had suboptimal mechanical properties.

Fabricating parts for automobiles requires a fabrication method that  1) produces parts with high heat resistance and dimensional accuracy, 2) must be able to  accommodate frequent changes to the design and 3) has a short turn-around time.  Difficulties in satisfying all these requirements have meant the need to use expensive fabrication methods and materials leading to higher testing costs.

SL-UV HTR250 has enabled us to take full advantage of SLA while achieving high heat resistance and impact resistance in the fabricated parts.   We can do tapping and also tighten screws.  By using our resin, one can expect to cut costs and achieve shorter turn-around time while producing high quality end products with the desired mechanical properties. 

Mechanical Properties (ASTM)
Environmental response Water-soluble
Safety Antimony-free
No bisphenol A (BPA)
High toughness Tapping
Accuracy Parts can be assembled.
Special note High precision (JIS precision grade)
non-filler
Viscosity (cps) 970
Sensitivity (mJ/cm^2) 13
  Before heat treatment After heat treatment
Yield point tensile strength (MPa)
Tensile strength at break (MPa) 80.3 108
Growth (%) 4.5 3.8
Bending strength (MPa) 142.6 193.3
Flexural modulus of elasticity (MPa) 5240 6270
Izod impact strength (J/m) 23.3 62.7
Heating deformation temperature
(℃@0.46 MPa)
126 252以上
Heating deformation temperature
(℃@1.81 MPa)
81 129
Features
  • Heat resistance HDT (low load) 252°C or more
  • High accuracy (JIS precision grade)
  • High airtightness (no impregnation required)
  • Integrated processing is possible even if the shape is complicated
  • Quick delivery, low cost
  • Tap processing is possible
  • High impact resistance
  • No filler is included, so it is possible to make a visual model
Main applications
  • Trial manufacture of plastic parts that require heat resistance
  • Injection molding simple type
  • Visualization model of fluid and gas control components
Soluble and biocompatible epoxy resin
水溶性エポキシ生体適合性樹脂
水溶性エポキシ生体適合性樹脂Thus far, acrylic resin has been the material of choice for use with 3D printing when biocompatibility is the most important consideration.  However, it lacks the durability required for use in the medical field. RMAKB developed its own soluble epoxy resin which has high flexural strength as well as high impact resistance.  In addition, low viscosity enables printing with high dimensional accuracy, reproducibility, and increased productivity.  With this material, it is possible to print components that must be able to withstand significant mechanical stress.

We did not use antimony (a heavy metal) nor the environmental hormone bisphenol-A in our epoxy resin, achieving the safest rating according to GHS categorization.

The structural formula has already been defined and patented.  It is currently being tested for biocompatibility using the ISO10993-1 toxicity test and the  ISO20795-1 physical property test, and upon FDA approval, the compound will be officially available for medical use.

It is the safest organic compound and has three to four times the advanced physical properties of acrylic resin.
Mechanical Properties (ASTM)
Environmental response Water-soluble
Safety Antimony-free
No bisphenol A (BPA)
Accuracy High precision
Special note Low moisture absorption
Viscosity (cps) 256
Sensitivity (mJ/cm^2) 13
Yield point tensile strength (MPa) 71
Tensile strength at break (MPa) 66
Growth (%) 6.3
Bending strength (MPa) 130.8
Flexural modulus of elasticity (MPa) 4016
Izod impact strength (J/m) 46.5
Heating deformation temperature
(℃@0.45 MPa)
50.5
Heating deformation temperature
(℃@1.80 MPa)
54.4
Chemical safety
Elemental alert word Warning
Hazardous Information Contact with the skin can cause irritation.May be harmful to aquatic life.
Acute toxicity (Oral) Oral LD50 Rats>2,000mg/kg
Unclassified
Acute toxicity (transdermal) Oral LD50 Rats>2,000mg/kg
Unclassified
Acute toxicity (inhalation: vapor) Unclassified
Skin corrosion, skin irritation LLNA-DA method (TG442A simple method): positive (weakly sensitized)
Eye damage/eye irritation Unclassified
Fire Service Act Dangerous goods
Class 4 and 4 oils
Hazardous material class 3
Poisonous Dramatic Act not applicable
Substances indicated under the Occupational Health and Safety Law Not applicable
Substances to be notified Not applicable
PRTR Law Not applicable
Class 2 Designated Chemical Substances Not applicable
Ship Safety Law (1951) Not applicable
Civil Aeronautics Act Not applicable
Soluble and Biocompatible Epoxy Resin:Frequently Asked Questions
Which characteristics of the epoxy resin qualified it for a patent?
Conventional soluble epoxy resins cure very slowly, which made it unsuitable for 3D printing which requires rapid hardening. We formulated a new epoxy resin that cures much faster, making it suitable for use in 3D printing.
What are the merits of using epoxy resins for 3D printing?
Epoxy resins have a wide range of application and huge developmental potential.  The final products can be made to be soft or hard; in addition, the material can withstand significant amount of mechanical stress without breaking. 
Would it be possible to make artificial bones, for example?
It is definitely possible, but we will need to conduct more research and development for this application. Please contact us for more details.
Could you develop a new resin to make implants that will naturally dissolve overtime within the human body?
This is also feasible, but we will need to conduct more research on how to control the rate of dissolution of implants.   Please contact us for more details.
How would you demonstrate that a newly developed material is safe?
LD50 (LD50 acute oral toxicity test)
The biocompatibility of medical devices is evaluated by a series of tests described under ISO10993. In the case of our new epoxy resin where the material will have a wide range of application, the exact tests to be performed will depend on the specific properties required by a particular application. In other words, one must first determine the application of the new material before appropriate biocompatibility tests can be performed.

Once we find a corporate partner  that requests a specific application and is willing to sell the fabricated products, we will tailor our epoxy resin formulation to achieve the physical and mechanical properties required for each application,  and then have it tested for biocompatibility in a timely manner. 

Unlike other 3D printing materials, our epoxy resin does NOT contain bisphenol-A, a compound which is often used to increase durability but also has undesirable effects as an environmental hormone.   This means that our products can be used safely for neonatal medical device applications.

How is the printing carried out?
We use a 3D printing method called SLA (stereolithography)  to print organic and complex forms in a short amount of time.  Our epoxy resin requires laser beam of 365 nm wavelength for curing, which means it cannot be used with many of the personal 3-D printers that require 405nm wavelength.
What type of applications was this material developed for?
We developed it for oral cavity applications which requires high flexural strength and impact resistance. In addition, the material does not have environmental hormones, which makes it ideal for fabricating medical devices for newborns.
Will the patient die if s/he imbibes or ingests this material?
No, s/he will not die.
Will the new resin be available for purchase?
Yes, either through licensed resellers or an OEM. Please inquire for details.
Materials for desktop printers
Okamoto Chemical Industry’s materials are water-soluble, gentle on the skin, and have little environmental impact.
Contact
Please feel free to contact us.
If you have any questions about 3D printers or materials, please feel free to contact us.
Click here to request a 3D printing prototype.
株式会社快速成形秋葉原
Rapid Manufacturing Akihabara Inc.
2-6-4,Chuo,Warabi-City,Saitma Pref,Japan 335-0004