Spectra Group Limited

About Us

"Spectra Photopolymers develops and manufactures photopolymer materials, including 3D printing resins, coatings, adhesives and other radiation curing materials. Our company serves the needs of many sectors, including but not limited to healthcare, transportation and national defense industries. Spectra Photopolymers operates in a 33,000 square-foot facility where we provide our customers with manufacturing options ranging from development all the way up to large scale manufacturing, including customized packaging and white labeling."

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Adhesives & Sealants

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Spectra Group Limited H-Nu 640MP banner

Spectra Group Limited H-Nu 640MP

Functions:Photoinitiator
End Uses:Radiation Curable Coating, Radiation Curable Adhesive, Radiation Curable Ink

Spectra Group Limited H-Nu 640MP can cure a wide range of acrylate resins via free-radical mechanism. It is a commercial photoinitiator with a broad absorbance range of 570 nm to 670 nm (λmax = 649nm in DMSO).

Spectra Group Limited H-Nu 470 banner

Spectra Group Limited H-Nu 470

Functions:Photoinitiator
CAS Number:161728-47-8
End Uses:Radiation Curable Coating, Radiation Curable Adhesive, Radiation Curable Ink

Spectra Group Limited H-Nu 470 initiates both free-radical and cationic photopolymerization, using a different set of co-initiators depending on the polymerization process • Type II photoinitiator: H-Nu 470 acts as a light harvester, followed by energy or electron transfer to a co-initiator molecule; produced reactive species activate photopolymerization • Commercial photoinitiator (TSCA status: LVE), non-toxic (LD50>5000 mg/kg).

Spectra Group Limited H-Nu 640 banner

Spectra Group Limited H-Nu 640

Functions:Photoinitiator
CAS Number:941694-83-3
End Uses:Radiation Curable Ink, Radiation Curable Coating, Radiation Curable Adhesive

Spectra Group Limited H-Nu 640 can cure a wide range of acrylate resins via free-radical mechanism. It is a commercial photoinitiator with a broad absorbance range of 570 nm to 670 nm (λmax = 649nm in DMSO).

Spectra Group Limited H-Nu 815 banner

Spectra Group Limited H-Nu 815

Functions:Photoinitiator
End Uses:Radiation Curable Coating, Radiation Curable Adhesive, Radiation Curable Ink

Spectra Group Limited H-Nu 815 can cure a wide range of acrylate resins via free-radical mechanism. It is a commercial photoinitiator with a broad absorbance range of 690 nm to 850 nm (λmax = 828nm in DMSO).

Spectra Group Limited H-Nu 535 banner

Spectra Group Limited H-Nu 535

Functions:Photoinitiator
CAS Number:142189-38-6
End Uses:Radiation Curable Coating, Radiation Curable Adhesive, Radiation Curable Ink

Spectra Group Limited H-Nu 535 initiates both free-radical and cationic photopolymerization, using a different set of co-initiators depending on the polymerization process • Type II photinitiator: H-Nu 535 acts as a light harvester, followed by energy or electron transfer to a co-initiator molecule; produced reactive species activate photopolymerization • Commercial photoinitiator, non-toxic (LD50>2500 mg/kg).

Spectra Group Limited H-Nu 780 banner

Spectra Group Limited H-Nu 780

Functions:Photoinitiator
End Uses:Radiation Curable Coating, Radiation Curable Adhesive, Radiation Curable Ink

Spectra Group Limited H-Nu 780 can cure a wide range of acrylate resins via free-radical mechanism. It is a commercial photoinitiator with a broad absorbance range of 650 nm to 810 nm (λmax = 791nm in DMSO).

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