Carbon Black for Agricultural Film and Packaging
Mulch film, silage covers, greenhouse covers, drip irrigation pipes and heavy-duty sacks. The UV blocking of carbon black for agricultural film determines how long a film standing in the sun for years will last.
Agricultural plastics work in direct sunlight, exposed to temperature changes and agrochemicals. Polyethylene inevitably degrades under ultraviolet light; carbon black is the most effective and most economical way to delay this degradation.
How UV protection works
Carbon black protects in two ways: it physically absorbs incoming UV radiation so that it does not reach the polymer chain, and it traps the free radicals formed during degradation to stop the chain reaction. This second mechanism turns carbon black from a mere "shade" into an active stabilizer.
Applications
- Mulch film: Keeps soil temperature and suppresses weed growth. The black color provides both UV protection and opacity.
- Silage covers: An oxygen and light barrier, usually in a black-and-white multilayer structure.
- Drip irrigation pipes: Exposed to UV above ground throughout a long season.
- Heavy-duty sacks and FIBC: Durability for products stored outdoors.
- Water and fertilizer tanks: Thick-walled, long-life products.
The right dosage
The typical carbon black level in agricultural films is about 2–3% by weight. Raising the level does not extend protection linearly; beyond a certain point, the film starts to lose its mechanical properties. What matters is dispersing the right dosage very well.
What to Watch For in This Industry
Film thickness and pigment level are calculated together
Thin films need a higher pigment concentration for the same protection; the level can be reduced in thick-walled products.
Agrochemicals can deactivate UV stabilizers
Pesticides containing sulfur and chlorine break down some UV stabilizers. Carbon black is more resistant to this effect, which is an advantage of black films.
Gels and fish-eye defects come from dispersion
Black specks in a film are usually undispersed pigment agglomerates, and they also act as tear initiation points.
Recommended Products for This Industry
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Industry-Specific Questions
How many years of UV resistance does an agricultural film get?
With the right dosage and good dispersion, several seasons of durability are typical for black PE films; for thick-walled pipes this period is much longer. The exact duration depends on film thickness, the regional UV load and the additive system.
Can carbon black be used in transparent film?
No. Carbon black is opaque; transparent greenhouse covers use transparent stabilizer systems such as HALS and UV absorbers.
We see black specks in our film.
These are undispersed pigment agglomerates. We recommend reviewing the masterbatch quality, the screen pack mesh size and the extrusion shear.
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