Applications

TINUVIN® 400-DW is a versatile light stabilizer which can be used in a variety of waterborne coating systems. It has been designed to fulfill the high cost/performance and durability requirements of Interior and exterior industrial, decorative and automotive coatings. The high thermal stability and photo-permanence makes it suitable for coatings exposed to high bake temperatures and/or to extreme environmental conditions. It is not sensitive to metal ions and amines and does not form colored complexes in their presence. TINUVIN® 400-DW is ideal for applications where strong protection from UV-B radiation is required. In general, it fully keeps dry film optics such as self-color, gloss and transparency. Other coating film properties such as water impermeability and blocking resistance, hardness and scratch resistance are not reduced. Its use is recommended for clear and lightly pigmented coatings.

TINUVIN® 400-DW is especially suited for waterborne acrylics and PUD dispersions or where traditional 2-(2-hydroxy-phenyl)-benzotriazole UVA fail due to metal and/or amine interactions with color formation.

For outdoor applications TINUVIN® 400-DW should be combined with hindered amine light stabilizers (HALS) such as TINUVIN® 123-DW or TINUVIN® 292 to enhance performance. Such synergistic combinations exhibit excellent protection against surface defects like loss of gloss, chalking and cracking, blistering and delaminating as well as preventing color change for both the coating and the substrate.

The amount of TINUVIN® 400-DW required for optimum performance depends on film thickness and pigmentation. It should be determined by a series of trials covering a concentration range.

Features and Benefits

• Encapsulated hydroxyphenyl-triazine UVA with high extinction in the UV-B region
• Low color, low migration
• Excellent photopermanence