Tripropylene Glycol Diacrylate (TPGDA)

Name: Tripropylene Glycol Diacrylate (TPGDA)
Brand: Royalchem
Rating: 5.0 (37 reviews)

CAS NO. 42978-66-5

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Model:
Industrial Grade TPGDA
Brand:
Royalchem
Code:
42978-66-5

Product Description

Product Name	Tripropylene Glycol Diacrylate (TPGDA) (Difunctional Acrylate Monomer / Reactive Diluent)
CAS NO.	42978-66-5
Formula & Molecular Weight	C₁₅H₂₄O₆ (MW: 300.35) \| EC: 256-032-2 \| MDL: MFCD00064598
Chemical Structure
Product Type	Difunctional acrylate reactive diluent / radiation-curing monomer TPGDA contains two polymerizable acrylate groups and is designed to participate in free-radical curing rather than function as a conventional evaporative solvent.
Typical Commercial Profile	Appearance: Colorless to pale yellow clear liquid Functionality: 2 Typical Viscosity: Low viscosity; commercial TPGDA grades are commonly around 10–15 mPa·s at 25°C Specific Gravity: Approximately 1.04–1.05 Refractive Index: Approximately 1.45 Water Solubility: Low / practically insoluble Inhibitor: Commercial grades are normally stabilized; inhibitor type and concentration should be confirmed against the applicable supplier specification Commercial TPGDA may contain related isomers. Assay, GC composition, color, acid value, moisture and inhibitor level vary by commercial grade. Final specification is subject to the applicable supplier TDS and batch COA.
Key Applications	TPGDA is a widely usedlow-viscosity difunctional reactive diluentfor free-radical radiation-curing formulations. UV / LED Curable Coatings:Used to reduce formulation viscosity while participating in the cured network. Relevant applications include wood, plastic, metal and other industrial coating systems. UV / EB Printing Inks:TPGDA is widely used as a reactive diluent in radiation-curable graphic arts, inkjet and other printing-ink formulations. UV Adhesives:Used with acrylate oligomers and other reactive monomers to adjust processing viscosity, cure response and final film properties. Electron-Beam Curing:The two acrylate groups participate directly in free-radical EB polymerization, allowing TPGDA to become part of the final polymer network. Polymer Synthesis:TPGDA may also be used as a difunctional co-monomer where controlled crosslinking is required.
Packaging, Storage & Shipping	Packaging:Commercial packaging is selected according to grade, order quantity and transport requirements. Final package size and container type are confirmed with the commercial order. Storage:Keep containers tightly closed in a cool, dry and well-ventilated area protected from direct light and excessive heat. Avoid conditions that may initiate uncontrolled free-radical polymerization. Follow the storage temperature and inhibitor requirements stated in the applicable TDS/SDS.

Sourcing TPGDA for UV, LED or EB Formulations?

Royalchem supplies Tripropylene Glycol Diacrylate (TPGDA, CAS 42978-66-5)for radiation-curable coatings, inks, adhesives and polymer formulations. TPGDA combines low viscosity, difunctional reactivity and useful formulation flexibility, making it a widely used reactive diluent for energy-curing systems. Batch-specific COA, SDS, specification confirmation and international logistics supportare available for commercial supply.
Contact Royalchem with your target application, viscosity, color, acid value, inhibitor requirement and quantity for grade matching and quotation.

Why Is TPGDA Called a Reactive Diluent?

Viscosity Reduction	TPGDA has a relatively low viscosity and can reduce the processing viscosity of higher-viscosity acrylate oligomers and resins.
Reactive During Cure	Unlike a conventional solvent, TPGDA contains polymerizable acrylate groups and participates in UV, LED or EB free-radical curing, becoming part of the final polymer network.
Difunctional Structure	Its two acrylate groups allow TPGDA to contribute to crosslinking while providing a useful balance between reactivity and flexibility in many radiation-curable formulations.

TPGDA vs Common UV Reactive Diluents

Monomer	Functionality	General Formulation Role
TPGDA	2	Low viscosity, high diluting power and balanced reactivity / flexibility
IBOA	1	Monofunctional reactive diluent useful where lower crosslink density and high Tg are desired
TMPTA	3	Higher-functionality monomer typically selected for higher crosslink density, fast surface cure and hardness
ACMO	1	Polar monofunctional monomer used where solvency, compatibility and adhesion-related formulation properties are important

What Specifications Matter When Buying TPGDA?

GC Composition / Assay	Commercial TPGDA may contain related structural isomers. Buyers should compare the supplier's GC method and definition rather than assuming that all commercial grades use the same purity basis.
Viscosity	Viscosity directly affects formulation handling and diluting power. Commercial TPGDA grades are typically low-viscosity liquids.
Color & Acid Value	These parameters can be important for clear coatings, sensitive resins and applications where appearance or formulation stability is critical.
Inhibitor	TPGDA is normally supplied with a polymerization inhibitor. Customers with specific curing or storage requirements should confirm inhibitor type and concentration before ordering.

Frequently Asked Questions

What is TPGDA?	TPGDA is the common abbreviation for Tripropylene Glycol Diacrylate, CAS 42978-66-5. It is a difunctional acrylate monomer widely used as a reactive diluent in UV, LED and EB curing systems.
Is TPGDA a solvent?	TPGDA is better described as a reactive diluent. It lowers formulation viscosity but, unlike a conventional volatile solvent, participates in polymerization and becomes part of the cured film.
Is TPGDA monofunctional or difunctional?	Difunctional. TPGDA contains two acrylate functionalities and is classified by major radiation-curing suppliers as a difunctional reactive diluent / acrylic monomer.
Is TPGDA the same as PHOTOMER® 4061?	PHOTOMER® 4061 is an IGM Resins commercial product based on TPGDA, CAS 42978-66-5. However, a generic TPGDA grade should not automatically be described as “equivalent” to PHOTOMER® 4061 unless its analytical specification and application performance have been compared.
Why shouldn't TPGDA always be described as 99.9% pure?	Commercial TPGDA can contain related isomers, and different suppliers use different analytical specifications. Product selection should therefore consider the stated GC method together with viscosity, color, acid value, water and inhibitor content rather than relying on a generic 99.9% purity claim.
What is the difference between TPGDA and TMPTA?	TPGDA is difunctional, whereas TMPTA is trifunctional. TMPTA generally provides higher crosslink density and fast cure, while TPGDA is commonly selected when low viscosity and a balance of reactivity and flexibility are required.
Can Royalchem provide COA and SDS?	Yes. Batch-specific COA, SDS and specification confirmation can be provided for commercial supply. For formulation-sensitive applications, please provide your viscosity, color, acid value, inhibitor and quantity requirements when requesting a quotation.