APPLICATION INFORMATION
LIGHT STABILIZATION FOR POLYPROPYLENE AND COMPOUNDS

TP-A 5

02

Light stabilization for polypropylene and compounds

Contents
03 The challenge
04 The solution
05 Excellent long-term stabilization
06 High concentration of active ingredients
06 Easy to handle
06 Conclusion

03

The challenge
Polypropylene is commonly used in the automotive industry,construction materials, agricultural films, consumer and recreational
goods as well as fibers and textiles. Polypropylene-based articles aresubject to property and surface quality degradation when exposed tolight over time. Prolonged exposure to light can cause color andgloss change in addition to physical property degradation.

NoteTo ensure the best appearance
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open in Adobe Acrobat.

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Light stabilization for polypropylene and compounds

The solution
BYK-MAX LS 4125 is a pelletized organic UV stabilizer
system that can mitigate the property and surface­degradation caused by light exposure. This product is asynergistic blend of highly concentrated stabilizers that­inhibit the light-induced reactions leading to decompositionof the PP material. BYK-MAX LS 4125 also acts as a radical
scavenger and peroxide decomposer. Due to it’s outstanding
UV stability for thick-film PP products, this additive is highly
recommended for outdoor applications including deck,
patio, and garden furniture, automotive interior and exterior
parts, carpets, films, tapes, and more.
Typical applications require between 0.5 % – 2.0 %dosage depending on durability requirements and color.
BYK-MAX LS 4125 can be added via volumetric orgravimetric dosing units during processing in compounding,tape/film extruders, spinning plants, and injection moldingmachines. It is suitable for processing temperatures up to290 °C (554 °F).

BYK-MAX LS 4125
Product typeUV/Light Stabilizer
Application
Exterior and interiorpoly­propylene articles
exposed to intense light
Key benefits• Excellent long-term lightstabilization• High concentration ofactive ingredients• Easy to handle/feed05

Light stabilization for polypropylene and compounds

Excellent long-term stabilization
BYK-MAX LS 4125 – Weathering studies 1 % dosage on PP in 30 % GFPP
Delta-E/gloss measured using SAE J2527 (Exposure in kJ)

32,5202
Delta-E151,510

150,50Many non-automotive durable goods markets
require weathering in excess of that shown
above. BYK-MAX LS 4125 has proven effectivein systems requiring exceptionally long-term
durability.

00500

Average Delta-E of 3 samples   

1.000

1.500

2.000

2.500

3.000

3.500

4.000

4.500

5.000

5.500

G. 01

Average 60-Degree gloss of 3 samples

BYK-MAX LS 4125 – Weathering studies 2 % dosage on PP in 40 % GFPP
Delta-E/gloss measured using SAE J1960 (Exposure in hours)

76Delta-E

560-Degree gloss

Typical automotive testing requires samples towithstand stimulated outdoor exposure up to4,000 kJ with color change no greater than aDelta-E of 3.0. Additionally, significant changes
in gloss are also not acceptable. When properly
applied, BYK-MAX LS 4125 easily meets andexceeds these requirements.

25

60-Degree gloss

The combination of stabilization technologies
in BYK-MAX LS 4125 work synergistically toprovide long-term light stabilization to meetthe requirements of both automotive and othermarkets.

432100

1.000

2.000

3.000

Average Delta-E of 4 samples cut from sheets   

4.000

5.000

6.000

7.000

8.000

9.000

Average 60-Degree gloss of 4 samples cut from sheets

10.00011.00012.00013.00014.000G. 02

06Light stabilization for polypropylene and compounds

High concentration ofactive ingredients
BYK-MAX LS 4125 has a 50 % active ingredient level, minimizing
the amount of carrier resin needed. The typical amount ofcarrier resin required adds unnecessary cost for the customer.
Due to the product form of the stabilizers required for thisperformance, this level of activity is difficult to achieve using
standard manufacturing processes. BYK’s proprietary processes
minimize the use of carrier resin required to produce theseconcentrates leading to the lowest total cost.

Easy to handle
Providing easy to use products is key to customer satisfaction.
Controlled migration of key active ingredients to the exposed
areas of the product is essential to the performance of
BYK-MAX LS 4125. While this migration is necessary anddesirable in the molded article, the concentration of these lowmelting point ingredients in the concentrate would create
challenges in customer manufacturing processes were it not for
proprietary BYK manufacturing technology. This technology
enables the high active ingredient level of BYK-MAX LS 4125
and minimization of total cost to the customer while maintaining
free-flowing and easy to handle finished products.

Conclusion
BYK-MAX LS 4125 is an excellent UV stabilization system forpolypropylene-based outdoor articles from furniture to interior and exterior automotive parts. Its high active ingredientlevel minimizes the amount of carrier resin needed, reducing
total cost for the customer.

Due to BYK’s proprietary technology, B­ YK-MAX LS 4125 is afree-flowing, easy to handle product that provides superior
long-term performance, minimizing color and gloss changeover time.

11/2021
TP-A 5BYK-Chemie GmbH
P.O. Box 10 02 4546462 Wesel
GermanyTel +49 281 670-0
Fax +49 281 65735

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The information herein is based on our present knowledge and experience. The information merely describes the properties of our products but noguarantee of properties in the legal sense shall be implied. We recommend testing our products as to their suitability for your envisaged purpose
prior to use. No warranties of any kind, either express or implied, including warranties of merchantability or fitness for a particular purpose, are maderegarding any products mentioned herein and data or information set forth, or that such products, data or information may be used without infringing
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This issue replaces all previous versions.