R912B

R912B belongs to the "halogen-free flame retardant" category; its official full name is "PET Halogen-Free Flame Retardant R912B"; it belongs to the flame retardant series (series slogan "halogen-free · transparent · synergistic"). Three core components: a phosphorus-based compound as the main flame-retardant component, together with a small amount of a nitrogen-based synergist and a non-ionic surfactant dispersant. (Data source: product handbook / official product data)

[Product Overview] Verbatim: "This product is a halogen-free flame retardant developed specifically for polyethylene terephthalate (PET) materials; it contains no halogen (chlorine, bromine, etc.) and meets environmental requirements. It is melt-incorporated into the PET resin system by internal addition, significantly improving the flame retardancy of PET materials while having little effect on their mechanical properties and processing properties; suitable for a variety of products such as PET fibers, films, and engineering plastics." (Data source: product handbook / official product data)

The positioning text on the official detail page states: "a halogen-free flame retardant developed specifically for polyethylene terephthalate (PET) — melt-incorporated into the PET resin system by internal addition, significantly improving flame retardancy while having little effect on its mechanical properties and processing properties"; the header reads "exclusive to PET fiber · film · engineering plastics · phosphorus-nitrogen synergistic system". (Data source: official product data)

Relationship to the R912 numbering: no naming explanation for the "B" suffix is found in the materials, nor do the materials place the two grades in the same sentence of relational description; the comparison between this page and R912 is presented throughout solely according to the independent records in the respective technical data sheets of the two products — comparison ≠ an interpretation of the meaning of the suffix. (Data source: product handbook / official product data)

• Halogen-free and environmentally friendly — "contains no halogen; when burned, it does not produce toxic or harmful hydrogen halide gases, and it complies with international environmental regulations such as RoHS and REACH".
• Flame-retardant efficiency — phosphorus-based main component: inhibits free-radical reactions, forms an intumescent char layer that blocks oxygen and heat transfer, and dripping carries away surface heat; a small amount of a nitrogen-based synergist "enhances flame-retardant efficiency and reduces the dosage".
• Property retention — "has little effect on the mechanical properties of PET materials (such as tensile strength and impact strength) and can maintain the material's original heat resistance and chemical resistance".
• Good compatibility — "excellent compatibility with the molecular structure of PET resin; not prone to exuding during melt processing, and does not affect PET's molding performance (such as spinning, injection molding, extrusion, etc.)".
• Clear processing window — recommended processing temperature 230℃-280℃ (20-30℃ lower than conventional PET processing temperature), avoiding the difficulty in molding caused by reduced PET viscosity at high temperatures.
• Rating and oxygen index — at a dosage of 1.5%-5%, PET materials can reach UL94 V-0 rating; the limiting oxygen index (LOI) is raised to above 38%.

Core components (three items, verbatim from the materials): ① main flame-retardant component "a phosphorus-based compound as the core, which achieves the flame-retardant effect by inhibiting free-radical reactions during combustion, forming an intumescent char layer that blocks oxygen and heat transfer, and carrying away surface heat through dripping"; ② synergist "a small amount of a nitrogen-based compound, which acts synergistically with the phosphorus-based component to enhance flame-retardant efficiency and reduce the dosage"; ③ dispersing aid "a non-ionic surfactant dispersant, which helps the flame-retardant components disperse uniformly in the PET resin, avoids agglomeration, and ensures consistency of the flame-retardant effect". (Data source: product handbook / official product data)

"Phosphorus-nitrogen synergy" has its direct source in items ①② of the paragraph above: phosphorus is the main mechanism (the three elements of free-radical inhibition + intumescent char layer + molten dripping carrying away heat), and nitrogen provides synergistic enhancement and dosage reduction. The official detail page likewise presents the component card under the theme of "phosphorus-nitrogen synergy"; its "addition requirement comparison" chart is marked in the official text as "schematic, not a measured ratio" — this page reproduces that annotation and does not treat the schematic as data. (Data source: official product data)

A supplementary sentence on flame-retardant performance: "effectively inhibits flame spread and accelerates dripping" — dripping is described in the materials as part of the mechanism; this grade's page does not provide a "dripping type" label, nor does it provide explanations of the kind "what to do if non-dripping is required" (the latter is an entry on other grades' pages and has not been carried over). The official "mechanism of action" field (supplemented on 2026-10-06 according to the product specification): originally a blank value, now recorded as "phosphorus-based + nitrogen-based synergist synergy" (derived from the two items ①② in the preceding paragraph), consistent with the main text of the materials. (Data source: product handbook / official product data)

1. Free-radical inhibition — phosphorus-based main componentThe phosphorus-based compound inhibits free-radical reactions during combustion (verbatim core component from the materials).
2. Intumescent char layer — blocks oxygen and heatAn intumescent char layer forms during combustion, blocking oxygen and heat transfer (verbatim core component from the materials).
3. Molten dripping carries heat — inhibits flame spreadDripping carries away surface heat, "effectively inhibits flame spread and accelerates dripping" (original sentence from the materials).
4. Nitrogen-based synergy — enhanced efficiency, reduced dosageA small amount of a nitrogen-based compound acts synergistically with the phosphorus-based component, enhancing flame-retardant efficiency and reducing the dosage; the non-ionic dispersing aid ensures uniform dispersion of the components and avoids agglomeration.

This grade does not include a separate physical/chemical specification table; the items below are taken verbatim from the source text and official product data (blanks are not filled in, values are not invented). The values in the table are those recorded in the source; before bulk use, small-scale testing with your own PET grade is recommended.

Reading notes: ① The flame retardant rating, dosage and article thickness are bound together ("adjusted according to article thickness"); ② This grade's page does not list physical/chemical indicators such as appearance, density, moisture, particle size / fineness, active content — pending supplementation in the source; this page does not fill them in with values from related grades; ③ The values in the table are those recorded in the source; small-scale testing is recommended before bulk use. (Data source: product handbook / official product data)

Recommended dosage quoted verbatim: 1.5%-5% ("according to the flame retardant rating requirements of the PET article... the optimal ratio can be determined through small-sample testing"), and is bound to the flame retardant rating and article thickness — "at a dosage of 1.5%-5%, the PET material can reach the UL94 V-0 flame retardant standard (adjusted according to article thickness)". The basis of the denominator is not stated in the source.

Dosage, target rating and article thickness are bound together: at a dosage of 1.5%-5%, UL94 V-0 can be achieved (adjusted according to article thickness). The source does not provide measured points for "thickness × dosage → rating", and this page does not extrapolate; the processing temperature window is given separately as 230℃-280℃ (20-30℃ lower than conventional PET processing temperature).

To be verified: ① The basis of the dosage denominator (relative to resin mass / total system mass) is not stated in the source; ② Measured points (thickness × dosage → rating) are not provided; ③ The above are values recorded in the source; for actual production, please confirm through small-scale testing with your own PET grade and article thickness.

The applicable substrate is PET as a single substrate (the source does not extrapolate to PETG / TPU / PE / PP); the handbook's [Scope of Application] is quoted item by item below.

PET fiber

Such as flame retardant apparel fabrics, curtain fibers, industrial filter media, etc.

PET film

Flame retardant packaging film, electrical insulating film, etc.

PET sheet

Decorative panel surfaces, etc.

Overview scenarios

"Applicable to PET fibers, films, engineering plastics and various other articles."

Official scenarios (detail page)

Flame retardant apparel fabrics / curtain fibers / industrial filter media / flame retardant packaging film / electrical insulating film / decorative panel surfaces.

Process

Internal addition via melt blending: mix thoroughly with PET chips, melt-blend in a twin-screw extruder and then pelletize, then shape (spinning, injection molding, extrusion).

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

Within-series comparison of the flame retardant range: substrate first, then grade; R912B and R912 differ by only one suffix, and the comparison of the two grades is based solely on the independent entries in their respective technical data sheets (comparison ≠ an interpretation of the suffix meaning).

Reading notes: (1) R218 belongs to the "flame retardant synergist" category (partial replacement for antimony trioxide) and is not included in this table; (2) the comparison of R912B and R912 offers no interpretation of the suffix and states no version relationship; (3) the values in each row come from that grade's own documentation and are not cross-applied to other grades. (Data source: product handbook / official product data)

The following points are taken item by item from the documentation; items not listed in the documentation are not drafted on the product's behalf.

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

• Product handbook: the full sections of this grade's technical data sheet (product overview / core components / main performance characteristics / scope of application / instructions for use / storage and precautions / packaging).
• Official product data: all fields for this grade (name, category, description, application, parameters, main components, recommended dosage); flame retardant range entries; official detail page copy.

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

• The meaning of the "B" suffix naming and its relationship to the two grades: not explained in the documentation; this page has stated it faithfully as "not clearly distinguished in the documentation."
• Missing items in the physicochemical specification table: appearance, density, moisture, particle size / fineness, active content—no specification table is attached to this grade's page.
• The denominator basis for the addition level (relative to resin mass / total system mass) is not stated in the documentation; measured data points (thickness × addition level → grade) are not given.
• Evidence for the flame retardant grade (test bars, thickness, testing institution, report number), LOI test method, halogen content threshold and test report — not given in the documentation.
• The transparency statement (not listed in the main body of the documentation / detail page scenario card "little effect on transparency") is pending a decision on the product side; quantitative data is not given.
• The quantitative data retained for mechanical / heat resistance / chemical resistance properties, and the test method and criteria for "not easily migrating" — not given in the documentation.
• How the shelf life is counted from and the period of validity after opening — not given in the documentation and not drafted on the product's behalf.