RIASORB® UV-328

Identification & Functionality

Chemical Family

Benzotriazoles

Chemical Name

2-(2H-Benzotriazol-2-yl)-4,6-ditertpentylphenol

CASE Ingredients Functions

Light Stabilizer,

UV Absorber

CAS No.

25973-55-1

EC No.

247-384-8

Technologies

CASE Ingredients

Product Families

CASE Ingredients — Additives

Functional Additives

Molecular Formula

C₂₂H₂₉N₃O

Chemical Structure

Features & Benefits

CASE Ingredients Features

Color Retention,

Crack Resistance,

Excellent Solubility,

Good Compatibility,

Good Gloss Retention,

Low Temperature Flexibility

Applications & Uses

Markets

Automotive & Transportation,

Paints & Coatings

Applications

Paints & Coatings — Automotive & Transportation

Automotive OEM Coatings

Paints & Coatings — Building & Construction

Wood Coatings & Finishes

Automotive & Transportation — Coatings & Finishes

Automotive OEM Coatings

Paints & Coatings — Industrial Coatings

Industrial Coatings

Compatible Substrates & Surfaces

Wood

Applications

• RIASORB® UV-328 is a benzotriazole UV absorber, providing strong absorption in UV region, and it has good compatibility, good solubility. RIASORB® UV-328 protects coatings from discoloration, gloss reduction, cracking. It is suitable for wood coatings, general industrial coatings, automotive coatings.
• RIASORB® UV-328 is recommended to use in combination with HALS such as RIASORB® UV-292, RIASORB® UV-123. RIASORB® UV-328 is better suited for ambient or low temperature systems.

Properties

Physical Form

Granules,

Solid

Appearance

White to slightly yellow granule

Typical Properties

	Value	Units	Test Method / Conditions
Molecular Weight	351	—	—

Solubility

	Value	Units	Test Method / Conditions
Acetone (at 25℃)	12	g/100g	—
Butyl Acetate (at 25℃)	35	g/100g	—
Diethylene Glycol Monobutyl Ether (at 25℃)	9	g/100g	—
Ethanol (at 25℃)	2	g/100g	—
Methyl N-Amyl Ketone (at 25℃)	35	g/100g	—
n-Hexane (at 25℃)	27	g/100g	—
PMA (at 25℃)	13	g/100g	—
Solvesso 100 (at 25℃)	min. 50	g/100g	—
Water Content (at 25℃)	max. 0.01	g/100g	—
Xylene (at 25℃)	min. 50	g/100g	—

Regulatory & Compliance

Certifications & Compliance

ISO 14001,

OHSAS

Technical Details & Test Data

UV Spectra

10 mg/L in Chloroform

Safety & Health

Handling & Safety

The use of proper protective equipment is recommended. Excess exposure to the product should be avoided. Wash thoroughly after handling.

Storage & Handling

Shelf Life

24 Months

Storage Conditions

Store the product in a cool, dry, well ventilated area away from incompatible materials, keep tightly closed. With proper storage, shelf life of this product is 24 months from the manufacture date.