M918

M918 belongs to the functional masterbatch category (functional masterbatch series); its Chinese name is "PA6 Nylon Halogen-Free Flame Retardant Masterbatch M918" (handbook title) / "PA6 Nylon Spinning Halogen-Free Flame Retardant Masterbatch M918" (official name). The handbook table-of-contents line, verbatim: "M918: PA6 halogen-free flame retardant masterbatch (spinning) — PA spinning halogen-free flame retardant, PA film halogen-free flame retardant (phosphate type)". The official tagline line: "Dripping-type flame retardancy · drips do not ignite absorbent cotton · 350 mesh filter screen". (Data source: product handbook / official product data)

Composition and process, verbatim: "M918 nylon halogen-free flame retardant masterbatch is compounded from phosphate flame retardant, hyperdispersant, PA6 resin, etc., passed through high-speed shearing and a 350 mesh filter screen, and pelletized." Function statement: "M918 is a fully organic flame retardant, and the flame retardant mechanism is the dripping type. It can effectively retard flame and achieve good compatibility performance." (Data source: product handbook / official product data)

Page positioning statement, verbatim: "A halogen-free flame retardant masterbatch developed specifically for PA6 nylon fiber spinning — high-shear granulated and passed through a 350 mesh filter screen, retaining agglomerates and ensuring continuous spinning; it is a dripping-type flame retardancy, the falling melt drips carry away the combustion and promote self-extinguishing, and the drips do not ignite the absorbent cotton below, meeting the UL94 V-0 restriction on dripping." (Data source: official product data)

Halogen statement: the product name itself is "halogen-free flame retardant masterbatch"; the English name contains Halogen-free; the page notes "free of chlorine and bromine · low smoke · no hydrogen halide" and "dripping type · halogen-free · low smoke". This product is a halogen-free grade, and the page's compliance wording is written in the halogen-free direction. Note: the correspondence between this grade and any additive grade is not given in the materials (the official "MXXX internally uses RXXX" phrasing is explicitly stated for other grades, while this grade has no such field); this page does not infer or supply any such relationship. (Data source: product handbook / official product data)

• Dripping-type flame retardancy — "During combustion, melt drips form and fall, carrying away heat and combustible decomposition products, so that the flame loses the conditions to sustain itself and self-extinguishes. Dripping is the normal flame retardant behavior of this system, not a defect."
• V-0 dripping criterion — "UL94 V-0 permits dripping, but requires that the drips must not ignite the absorbent cotton below; at the same time, afterflame ≤10s per single occurrence, ≤50s in total for 5 specimens, afterglow ≤30s, and the flame must not spread to the clamping end." The actual rating is given in the COA accompanying the shipment.
• 350 mesh filter screen process — high-shear dispersion granulation and passage through a 350 mesh filter screen ensure spinning continuity; the page notes "conventional granulation is only 40–80 mesh and leaves residual agglomerates", and gives the demonstrative comparison statement of "6/6 orifices extruding filament uniformly in the continuous state".
• Spinning suitability — good compatibility with PA6 resin and uniform dispersion, "while ensuring flame retardancy it does not degrade the spinnability and mechanical properties of the fiber" (qualitative statement; quantitative data not given).
• Application list (four official items) — PA6 industrial filament / webbing · safety belt yarn / ropes · fishing nets / luggage fabric · engineering spinning.
• Numerical statements (two sets coexist) — the handbook specification table and the official fields give values such as 8%-12% / <325℃ / UL94V0 / 1.22g/cm³ / 1.9DI/g; the page, however, takes the conservative position of "see the COA accompanying the shipment / the original TDS" for numerical indicators. The two are presented side by side.

System and process: compounded from phosphate flame retardant, hyperdispersant, PA6 resin, etc., and pelletized after high-speed shearing and filtration through a 350 mesh filter screen. The filtration mesh rating is directly related to spinning: the higher the filtration precision, the fewer the residual agglomerates and the more continuous the spinning — this is an entry condition for high-precision processes such as spinning. (Data source: product handbook / official product data)

The flame retardant mechanism is the dripping type (fully organic system): during combustion, melt drips form and fall, carrying away heat and combustible decomposition products, so that the flame loses the conditions to sustain itself and self-extinguishes. The page states explicitly that "dripping is the normal flame retardant behavior of this system, not a defect"; it also gives the general dripping criterion for V-0 — the drips must not ignite the absorbent cotton below, and requires afterflame ≤10s per single occurrence, ≤50s in total for 5 specimens, afterglow ≤30s, and the flame must not spread to the clamping end. (Data source: product handbook / official product data)

Compatibility: the masterbatch has good compatibility with PA6 resin and disperses uniformly; the page's statement on the retention of spinnability and mechanical properties is qualitative — "does not degrade the spinnability and mechanical properties of the fiber". The materials do not give a detailed elaboration of the combustion mechanism, do not give the limiting oxygen index (LOI), and do not disclose the specific chemical name and proportion of the phosphate flame retardant — this page neither drafts them on the product's behalf nor applies the disclosed values of other grades. (Data source: product handbook / official product data)

1. Compounding and filtration — high shear + 350 mesh filter screenPhosphate flame retardant, hyperdispersant, PA6 resin, etc. are compounded, dispersed under high shear, and then pelletized through a 350 mesh filter screen; agglomerates are retained, preventing spinneret orifice blockage.
2. Dry blending and spinning — dry blending with PA6 chipsPage usage statement: dry-blend uniformly with PA6 chips → spinning extrusion; equipped with a 350 mesh filter screen to prevent agglomerates from blocking the orifices.
3. Flame retardancy achieved — dripping-type self-extinguishingCombustion forms melt drips that fall, carrying away heat and combustible decomposition products, so the flame loses the conditions to sustain itself and self-extinguishes; the drips do not ignite the absorbent cotton below, meeting the V-0 restriction on dripping.
4. Boundary — rating subject to the COA accompanying the shipmentPage statement: the measured flame retardant rating is given in the COA accompanying the shipment; the handbook specification table states "flame retardant effect UL94V0" — the two are presented side by side.

The parameters recorded in the handbook specification table and in the official fields are as follows (the column headers are product code / addition ratio / processing temperature / flame-retardant effect / specific gravity / viscosity). The page separately carries the conservative wording "for numerical values, refer to the COA supplied with the goods"; the two are presented side by side. The values in the table are those recorded in the source materials; confirming with a small-scale trial before batch use is recommended.

Reading notes: (1) For the viscosity item, the source text writes "1.9DI/g" (the unit written as DI/g, visually similar to the conventional dL/g) — copied as is under the never-rewrite principle; the meaning of the unit and the test conditions are listed as pending verification; (2) The specific gravity of 1.22 g/cm³ is the highest tier among the flame-retardant masterbatches of the same series for which specific gravity data are available; (3) This grade is not accompanied by a complete physical and chemical specification table (water content, melting point, decomposition temperature, etc. are not listed), and this page does not draft one on its behalf. (Data source: product handbook / official product data)

The addition ratio follows the masterbatch series' "internal addition ratio" basis: calculated on the total mass of the resin system (example in the general rules: raw material 95% + masterbatch 5% = 100%). The range for this grade is 8%-12%.

Addition method: dry-blend uniformly with PA6 chips, then spin and extrude; fit a 350 mesh filter screen to eliminate agglomerates plugging the holes. Processing temperature: the source gives the upper limit "<325℃"; the page's wording is "refer to the conventional PA6 spinning temperature (see COA)" — the two are stated side by side, and the specific window value is not given in the source. Hard requirement in the general rules: "the processing temperature must not be higher than the maximum temperature recommended in the product brochure, otherwise it will damage the masterbatch's performance!"

Pending verification: (1) The thickness–dosage direction is not given in the source materials (whether it follows a ratio-setting route of the "determined by small-scale trial according to product specifications" type is to be confirmed with the product side); (2) the relationship between the two temperature wordings "<325℃" and "refer to the conventional PA6 spinning temperature (see COA)"; (3) the measured application points (thickness × addition level → rating) are not given in the source materials; (4) all of the above are values recorded in the source materials, and for the actual formulation please determine by small-scale trial.

The four items of the official application list and the application cards are given item by item below; the main line of use is PA6 nylon spinning and related fiber products.

PA6 industrial filament

"Industrial nylon filament requiring both flame retardancy and spinnability" (verbatim from the application card).

Webbing · seat belt yarn

"Fire-safety scenarios such as automotive seat belts and industrial webbing" (verbatim from the application card).

Ropes and cables · fishing nets

"Nylon fiber products requiring flame retardancy, such as marine ropes and fishing nets" (verbatim from the application card).

Luggage fabric · engineering spinning

"High-strength nylon fabrics and engineering plastics spinning systems" (verbatim from the application card).

Scenarios outlined in the handbook

"Mainly used in products such as spinning, films, extrusion casting and injection molding, with a significant effect on the fire and flame retardancy of the products."

Adaptation of the general masterbatch usage rules

Drying: PA6 at 100 degrees for 5 hours (or mix and dry according to the original process); for the first trial, add no other auxiliary materials / additives; store the remaining unused masterbatch sealed, to prevent moisture from affecting its next use.

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

On the functional masterbatch side, the four halogen-free flame retardant grades are divided by substrate (PE / PETG / PA6 / PP); this table gives the coordinates of this grade, and the comparison columns are the original text of the respective documents—values are not interchangeable.

Reading notes: (1) The four grades differ in substrate, system, ratio and temperature—values are not interchangeable; (2) The thickness-direction clauses are independent for each grade (three cases coexist: add / reduce / not given), and must not be elevated to a series-wide general rule, nor applied to one another; (3) The comparison columns are the original text of the respective documents. (Data source: product handbook / official product data)

The following points come item by item from the recorded materials; the masterbatch general usage rules and the product requirements are listed side by side.

The data on this page come from two types of materials, traceable item by item:

• Product handbook: the entry for this grade (TDS title / Chinese and English overview / specification table rows); the handbook table-of-contents line (including the phosphate-type suffix); the masterbatch series general usage rules (drying / hard requirement on processing temperature / definition of internal addition ratio / trial discipline / moisture-proof storage).
• Official product data: all fields of this grade (name, category, description, mechanism, application, specs); page-level copy (positioning statement, badge row, four application cards, V-0 criterion, 350 mesh process description, TDS table, usage recommendation section); the functional masterbatch series entry (list of externally released grades, series description).

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

• The correspondence between M918 and any additive grade—not given in the materials (this grade has no "internal use RXXX" field; R-series grades with the same number do not exist in any source); no inference is made.
• Thickness-dosage direction—not given in the materials (it can be neither said to be "add" nor "reduce").
• The unit meaning and test conditions of the viscosity "1.9DI/g"—copied as is without rewriting.
• UL94 V0 test specimens, thickness and testing institution; halogen-free determination threshold, RoHS / REACH statements and report numbers—not recorded in the materials.
• Specific values for packaging specification, shelf life and storage conditions, the chemical name and ratio of the phosphate flame retardant, and the oxygen index—not listed in the materials.