Universal High-Efficiency Black Masterbatch

The cost comparison must be made at equivalent unit color strength, not at equivalent price per kilogram. If a 20%-concentration grade costs X per kg and a 40%-concentration grade costs 1.6X per kg, the 40% grade is still cheaper on a per-unit-of-color basis — because you use half the quantity. In practice, the price premium for high-concentration grades is rarely 2× the base price, meaning the higher-concentration option almost always delivers a lower total masterbatch cost per tonne of finished film. This benefit compounds over high-volume production: for a converter running 3,000 tonnes of film per year at 2% letdown, the difference between 20 kg/tonne and 40 kg/tonne of masterbatch consumed is 60 tonnes of material per year.

mLLDPE resins have a narrower molecular weight distribution than conventional Ziegler-Natta LLDPE, which produces higher film clarity, toughness, and seal strength at lower gauge — but also higher sensitivity to additive-related disruptions. The filler-free character of 6005 makes it better suited to mLLDPE than filled alternatives, since there are no mineral particles to interact with the tighter polymer matrix. However, the MFR of 6005 (>10 g/10min at 21.6 kg) is higher than most mLLDPE resins, which means the masterbatch acts as a slight viscosity modifier in the blend — acceptable in most cases but worth verifying at trial before committing to full production. Contact our technical team with your mLLDPE grade and processing conditions for a specific recommendation.

Streaking in black blown film has three primary causes: inadequate carbon black dispersion in the masterbatch, moisture-induced vapor streaks from the melt, and contamination from base resin or regrind. Grade 6005 directly addresses the first two. The twin-screw compounding process achieves sub-micron carbon black dispersion, which eliminates dispersion-origin streaks. The <0.5% moisture specification ensures no vapor streaking at the die. The third cause — contamination — is upstream of the masterbatch and requires attention to base resin storage and regrind cleanliness. If streaking persists after introducing 6005 under dry conditions, the root cause is almost certainly in the base resin handling rather than the masterbatch itself.

Grade 6005 is a pure color masterbatch — it contains no slip agents, anti-block additives, or processing aids. Whether separate functional masterbatches are needed depends on your base resin and finished bag specification. Black film produced with 6005 at 2% letdown typically shows lower blocking tendency than unfilled film due to the micro-roughness introduced by the carbon black particles at the film surface — but this is not a substitute for a formulated anti-block system on lines where film-to-film blocking is a documented production problem. For courier bags that require easy-open behavior at the production line or for retail end-use, adding a separate slip/anti-block masterbatch at 1–2% alongside 6005 is the standard practice. E-LUCK can supply compatible functional masterbatches on request.

E-LUCK offers flexible trial quantities for first-time buyers running production validation. For 6005, trial quantities can be arranged from single bag (25 kg) up to full-pallet level, depending on your location and logistics arrangement. Because 6005 is a standard stock grade — not a custom formulation — lead times for trial orders are typically 5–10 working days from order confirmation to factory gate. Contact our sales team with your delivery port and approximate annual volume to receive a trial quotation; we will match the trial pack size to your minimum meaningful production run.

The longer shelf life of 6005 — 24 months versus the typical 12-month recommendation for filled grades — results directly from the absence of calcium carbonate filler. CaCO₃ is mildly hygroscopic: over time, stored bags absorb ambient moisture through micro-permeation in the outer packaging, raising the moisture content of the masterbatch pellets beyond the <0.5% specification. This process is accelerated in humid climates or improperly sealed storage. Because 6005 contains no CaCO₃, its sealed moisture uptake rate is significantly lower, supporting a longer on-shelf guarantee. For importers maintaining 6–12 months of inventory, this extended shelf life reduces the risk of out-of-specification material and lowers the frequency of pre-use moisture testing required before production.