M922

M922 belongs to the functional masterbatch category; its Chinese name is "PP Flame Retardant Masterbatch M922"; the handbook table-of-contents line, verbatim: "M922: PP low-halogen flame-retardant masterbatch — PP corrugated pipes, hollow sheets, spinning, films, injection molding". The official English positioning line, verbatim: "Low-halogen flame-retardant PP masterbatch for corrugated pipes, hollow sheets, spinning, films and injection molding." — This product is a "low-halogen" masterbatch (phosphorus, nitrogen and bromine compound system, containing bromine); the page describes it under a low-halogen framing and makes no "halogen-free"-type claims. (Data source: product handbook / official product data)

System self-description, verbatim: "M922 masterbatch is processed from our company's self-produced flame retardant R912; it is a flame retardant of the phosphorus, nitrogen and bromine compound system, antimony-free, and complies with the ROHS standard." (This sentence is the source's own wording; this page reproduces it verbatim and does not extrapolate the properties of other grades.) (Data source: product handbook / official product data)

Mechanism, verbatim: "Its flame-retardant mechanism is a dual solid-phase and gas-phase synergy that improves flame-retardant efficiency, supplemented by an appropriate catalytic reaction that accelerates resin dripping and rapidly carries heat away, thereby achieving a highly efficient flame-retardant effect." The page labels the mechanism as "solid phase + gas phase dual synergy + catalytic melt-drip heat removal". (Data source: product handbook / official product data)

Comparison with conventional systems (source, verbatim): "Compared with conventional octabromodiphenyl ether system masterbatches, M922 features low halogen content, no antimony, low specific gravity, no migration, low smoke emission and low mold corrosiveness; the product has high gloss and is easy to process." The page summarizes the differences as six comparison items: halogen content / antimony content / specific gravity / migration·blooming / smoke emission / mold corrosion. (Data source: product handbook / official product data)

• Low-halogen system — phosphorus, nitrogen and bromine compound (containing bromine); "low halogen content" relative to conventional octabromodiphenyl ether systems; antimony-free, RoHS compliant.
• Six comparison items (relative to conventional octabromodiphenyl ether systems) — low halogen content, antimony-free, low specific gravity, no migration / no blooming, low smoke emission, low mold corrosiveness.
• Processing performance (as stated on the page) — high surface gloss of the finished article, good melt flow, easy processing; extremely low corrosiveness to processing molds and equipment.
• Application breakdown (page) — PP corrugated pipes (conduit and other construction and industrial pipes); PP hollow sheets (flame-retardant packaging boards, hollow partitions, etc.); spinning and films (PP flame-retardant filament, staple fiber, packaging film, etc.); injection-molded articles (electronic and electrical plastic housings, automotive parts and various engineering injection-molded parts).
• Three dosage levels — homopolymer PP 3.5% / homopolymer-copolymer blend systems 4%–6% / copolymer PP 8%.
• Documents shipped with the goods — the page states "a COA test report is enclosed with each batch".

System: a phosphorus, nitrogen and bromine compound flame-retardant system (the source states it is processed from a self-produced flame retardant), antimony-free — antimony is a synergist metal, not a halogen, so "antimony-free" and the halogen tier are two independent matters: this product's halogen direction is described as "low halogen content" (relative to conventional octabromodiphenyl ether systems). (Data source: product handbook / official product data)

Flame-retardant mechanism: a dual solid-phase and gas-phase synergy that improves flame-retardant efficiency; supplemented by an appropriate catalytic reaction that accelerates resin dripping and rapidly carries heat away, thereby achieving a highly efficient flame-retardant effect. The page labels the mechanism as "solid phase + gas phase dual synergy + catalytic melt-drip heat removal". (Data source: product handbook / official product data)

The six-item summary of differences from conventional systems is given in section 1; the page additionally notes of this product "contains no heavy-metal antimony, RoHS compliant", "low smoke emission, extremely low corrosiveness to processing molds and equipment", "low specific gravity, good compatibility, no migration or blooming in long-term use, high surface gloss of the finished article, good melt flow, easy processing". The source gives no ppm-level measured values of halogen content, and gives no oxygen index (LOI) or quantitative mechanical data — this page does not supply them on the source's behalf. (Data source: product handbook / official product data)

1. Solid phase + gas phase dual synergySource mechanism sentence: "The flame-retardant mechanism is a dual solid-phase and gas-phase synergy that improves flame-retardant efficiency."
2. Catalytic dripping heat removal"Supplemented by an appropriate catalytic reaction that accelerates resin dripping and rapidly carries heat away, thereby achieving a highly efficient flame-retardant effect."
3. Internal addition into the systemAdded according to the masterbatch's "internal addition ratio" general rule (the denominator being the total mass of the resin system); good compatibility with PP systems, no migration or blooming in long-term use.
4. Three dosage levelsSelect the level by PP type: homopolymer 3.5%, homopolymer-copolymer blend 4%–6%, copolymer 8%; the flame-retardant rating is recorded in the source as UL94 V2 (no separate rating is given per level).

The product specifications recorded in the product handbook and official product data are as follows. The values in the table are as recorded in the documentation; before bulk use, it is recommended to run a small-scale trial with your own PP system to confirm.

Reading notes: (1) "effective flame retardant content 25" — the handbook specification table gives no unit, while the official product data records 25%; the two are shown side by side; (2) no oxygen index (LOI) data is recorded for this grade; (3) another column header in the specification table is an undefined internal code, not used on this page and not replaced with a fabricated value; (4) the masterbatch concentration is a property of the masterbatch itself and is a separate matter from the end-use addition ratio. (Data source: product handbook / official product data)

The dosage is divided into three tiers by PP type (verbatim from the documentation); the denominator follows the masterbatch series' "internal addition ratio" convention — total mass of the resin system (example from the general rules: raw material 95% + masterbatch 5% = 100%).

Trial dosage method (general rules for masterbatches): it is recommended to try several formulations to select the most suitable addition ratio; if the sample is only enough for one trial, use the highest recommended dosage; for a first trial, do not add other auxiliaries or additives at first, and add them gradually after a successful trial; when testing, take several sample sections for measurement. It is also recorded that "trial results vary; production equipment, process temperature, product formulation and other factors all affect the result — please run more trials, adjust the process, and patiently experiment to choose the optimal solution".

To be verified: (1) the tiering rationale for the three dosages (3.5% / 4-6% / 8%) and the corresponding product thickness conditions; (2) the maximum processing temperature for this grade is not listed; (3) the test thickness, specimen preparation and testing organization for UL94 V2; (4) all of the above are values recorded in the documentation; the actual formulation should be determined by small-sample testing.

The official application list is PP corrugated pipe, PP hollow board, chemical fiber, PP film, injection molding; the page's application breakdown is given item by item below.

PP corrugated pipe

Conduit pipes, corrugated pipes and other construction and industrial pipes (page application breakdown).

PP hollow board

Flame retardant packaging boards, hollow partition boards, etc. (page application breakdown).

Spinning and film

Flame retardant PP filament, staple fiber, packaging film, etc. (page application breakdown); the official application list includes chemical fiber.

Injection molded parts

Plastic housings for electrical and electronic appliances, automotive parts and various engineering injection molded parts (page application breakdown).

Compatibility note

The page records "low specific gravity, good compatibility, no migration in long-term use, no blooming"; the documentation does not provide a separate compatibility matrix entry.

Alignment with general rules for masterbatch use

Drying is required before trial (the drying list in the general rules covers PET / PA6 / PETG / PU / TPU, etc., not including PP; follow the original production process); the processing temperature must not exceed the maximum temperature recommended in the documentation; keep the remaining unused masterbatch sealed and protected from moisture.

Field issues & application examples (as recorded in the source material)

On the functional masterbatch side, lines are divided by substrate; this table gives the coordinates of this grade together with the boundaries of adjacent grades in the same series (the comparison columns are the original text of each respective document, and the values are not transferred between them).

Reading notes: (1) The two grades differ in halogen tier (low-halogen vs halogen-free direction) — choose a side according to compliance requirements; neither replaces the other; (2) The numerical basis for the addition ratio differs, so do not substitute one for the other; (3) The thickness-direction clause is independent for each grade (no direction is given for this grade). (4) The comparison columns are the original text of each respective document. (Data source: product handbook / official product data)

The following points are taken item by item from the documented records (including the general instructions for using the masterbatch series).

The data on this page comes from two types of documents, each traceable item by item:

• Product handbook: the full entry for this grade (title / overview / physicochemical properties / application fields / product specifications / packaging); the general instructions for the masterbatch series (material drying, hard requirements on processing temperature, definition of the internal addition ratio, trial-dosage method, moisture-proof storage); the comparison entry and catalog line for the same series.
• Official product data: all fields for this grade (name, category, positioning, description, mechanism, application, specifications, main components, dosage); page-level copy (positioning line, six-item comparison, application breakdown, dosage basis, packaging and storage, COA notes).

Not covered by the source material (not written on this page — to be added later)

• Measured halogen content at the ppm level and the third-party test report number; the threshold and test method for determining "low-halogen" — not provided in the documentation.
• The specific name and proportion of the bromine-containing component; its compounding relationship with the flame retardant source grade self-described in the documentation — not elaborated in the documentation.
• The unit and conversion basis for "effective flame retardant content 25" — the handbook does not specify a unit, while the official record states 25%, and the two are listed side by side.
• Upper limit of processing temperature, oxygen index (LOI), quantified mechanical data, UL94 V2 test details, shelf life — not listed in the documentation.
• The tiering rationale for the three dosage tiers and the corresponding article thickness conditions — not provided in the documentation.