Tiangang® MB6251PP20

Tiangang® MB6251PP20

Functional masterbatch · MB6251PP20

light stabilizing masterbatch designed to fulfill the requirement to protect the PP non-woven fabrics used as agricultural films against strong UV sunlight. It is particularly effective when used in thick long-life films

In one sentence: A PP-carrier UV masterbatch with 20% active content, aimed at a different nonwoven process window from 6250PP20.

  • Active content: 20% (source: grade description on this page)
  • Film and nonwoven let-down ratio: 2 – 5% (source: recommended dosing table on this page)
  • Injection moulding and extrusion let-down ratio: 2 – 4% (source: recommended dosing table on this page)

What it is

Tiangang® MB6251PP20 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

Product NameTiangang® MB6251PP20
DescriptionTiangang® MB6250PP21 is a light stabilizing masterbatch designed to fulfill the requirement to protect the PP non-woven fabrics used as agricultural films against strong UV sunlight. It is particularly effective when used in thick long-life films, > 100 micron, and expected service life of 2-3 seasons. MB6251PP20 also features improved resistance against acidic chemicals containing sulfur and chloride.
Dosage RecommendationsUsually 2% - 5% for greenhouse films (0.4 - 1% concentration of HALS), though exact dosage amount are affected by a number of factors, and should be determined by experiments.
ItemPercentage, %Description
1.Active Light Stabilizers20Light stabilizer blend
3.Active Antioxidants3Antioxidant providing protection during extrusion
4.Carrier77High melt index PP
TOTAL100

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.

Film and nonwoven2 – 5%
Moulding and extrusion2 – 4%
Based on active contentback-calculate from the target loading

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 MB6251PP20: carrier-to-matrix match, active content, and application fit. Same PP-carrier 20% family as 6250PP20, tuned for a different nonwoven process window; settle it on the line.

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.

Technical reviewTiangang Technical CenterVersion2026-11-07
Specifications and application notes on this page are compiled from Tiangang's published technical data. Actual values are governed by the COA shipped with each lot and the technical agreement confirmed by both parties.

Certifications

  • National High-Tech Enterprise
  • Vice Chairman Unit, China Plastics Processing Industry Association (CPPIA)
  • Vice Chairman Unit, Agricultural Plastics Branch, China Agricultural Plastics Application Technology Society
  • Member, Ageing Methods Subcommittee, National Technical Committee on Plastics (SAC/TC15/CS5)
  • Member, Society of the Plastics Industry (SPI), USA

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