Tiangang® MB570-20PET

What it is

Tiangang® MB570-20PET is a functional masterbatch. A masterbatch pre-disperses the active ingredient in a carrier resin and delivers it as pellets. The line simply blends it in, with no powder handling and no local over-concentration from weighing error.

Technical data

Where it is used, and at what loading

The carrier decides which polymer the masterbatch can go into: PE carrier for PE, PET carrier for PET. The wrong carrier gives poor dispersion, interfacial defects or haze.

Figures above are typical industry ranges, not guaranteed values. The actual loading depends on wall thickness, design life and the other additives in the system, and should be established by a loading ladder on the real formulation.

On the line

Divide the target loading by the active content to get the let-down ratio: a 20% masterbatch used at a 0.3% target means 1.5% let-down. Dry-blend with the base resin; no extra compounding step is needed. Dry hygroscopic carriers before running. When switching grades on the same line, confirm dispersion and surface appearance on a small batch first.

Choosing between similar grades

Three things decide the choice for MB570-20PET: carrier-to-matrix match, active content, and application fit. PET-carrier masterbatch with 20% UV-570 for polyester fibre and film; a PE carrier cannot substitute — the processing windows are too far apart.

Frequently asked questions

Masterbatch or powder — what is the real difference?

Three things: dispersion uniformity, dust, and weighing accuracy. Pre-dispersion puts the active at micron scale so thin parts do not show local defects; the line has no airborne powder; and blending a pellet ratio is far more accurate than weighing a trace of powder.

Why can the carrier not be swapped freely?

Carrier and matrix compatibility decides dispersion. A PE carrier in PP is tolerable; in PET it is not — the processing windows are too far apart and the carrier degrades first. We match the carrier to the matrix and show it in the grade code (MB6250PP20 is a PP carrier with 20% active).

How do I read the active content from the grade code?

From the numbers. MB570-20PET is 20% UV-570 in a PET carrier; MB6250PP20 is a PP carrier with 20% active. Divide the target loading by the active content to get the masterbatch let-down ratio.

The figures and guidance above follow Tiangang's published technical material and common industry practice. For a specific formulation, refer to the batch COA and the technical agreement between the parties.

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