R912

R912 belongs to the "halogen-free flame retardant" category; official full name "Transparent Halogen-Free Flame Retardant R912"; page product name "Transparent Flame Retardant for PET/PETG/TPU"; series affiliation: flame retardant series (series slogan "Halogen-free · Transparent · Synergistic"). Main component: tris(xylene lithium carbonate) phosphate (novel organophosphorus lithium salt flame retardant system). The company product overview paragraph in the handbook records in a parallel sentence "PE halogen-free flame retardant: R911, transparent halogen-free flame retardant: R912 & R915". (Data source: product handbook / official product data)

[Product Overview] verbatim: "Product model: R912; Product name: Transparent Flame Retardant for PET/PETG/TPU; Main component: tris(xylene lithium carbonate) phosphate (novel organophosphorus lithium salt flame retardant system); Product form: white crystalline powder; Applicable substrates: PET, PETG, TPU thermoplastic polymer materials; Product features: halogen-free and environmentally friendly, excellent heat resistance, excellent substrate compatibility, not prone to precipitation, low migration; controllable impact on material transparency, substrate light transmittance attenuation of about 20%, suitable for semi-transparent, low-transmittance flame retardant modification scenarios." (Data source: product handbook / official product data)

Official positioning line "Transparent halogen-free flame retardant, substrate light transmittance attenuation of about 20%"; official applications field: PET flame retardant / PETG flame retardant / TPU flame retardant. (Data source: official product data)

This grade and R915 share the "transparent" selling point, with partial overlap in substrate coverage (PET / PETG); the two grades are differentiated by "substrate + transparency level": R912 additionally covers TPU, with light transmittance attenuation of about 20%, falling under the semi-transparent, low-transmittance scope; R915 does not include TPU and falls under the high-transmittance scope. The values of the two grades are independent and are not cross-applied. (Data source: product handbook / official product data)

• Halogen-free and environmentally friendly—"halogen-free, no heavy metals, low smoke and non-toxic, complies with RoHS and REACH environmental requirements, suitable for chemical fiber, wire, film, and other compliant products".
• Controllable transparency—"unlike the high opacity problem of traditional powder flame retardants, this product is a modified transparent phosphorus-based powder and causes only about 20% light transmittance loss, meeting the production needs of semi-transparent flame retardant products".
• Processing thermal safety—"high initial decomposition temperature, fully compatible with the conventional extrusion, injection molding, and pelletizing processes of PET (230–280℃), PETG (190–250℃), and TPU (160–225℃); no decomposition, no yellowing, no smoking during high-temperature processing".
• Substrate compatibility—"no blooming, no exudation, no mold sticking"; Feature 1 records "little damage to the substrate's original mechanical properties, toughness, and weather resistance".
• Flame retardant efficiency—"the dual mechanism of condensed-phase char formation + gas-phase flame retardancy can rapidly increase the limiting oxygen index of the material, and with a reasonable formulation can easily achieve UL94V2 V0 flame retardant rating".
• Pre-use note—this product is a white crystalline powder; the powder is used after direct high-speed mixing with the base resin until uniform; before bulk use, it is recommended to conduct small-scale trial verification based on your own substrate and product thickness.

Composition and system: the main component is tris(xylene lithium carbonate) phosphate (novel organophosphorus lithium salt flame retardant system); the product form is white crystalline powder; the handbook table of contents line records it as "transparent halogen-free flame retardant". (Data source: product handbook / official product data)

Mechanism (unified after correction according to the product specification on 2026-10-06): Feature 1 "organophosphorus-lithium salt synergy" and Feature 5 "dual mechanism of condensed-phase char formation + gas-phase flame retardancy" form the main mechanism line; the official mechanism field has been corrected accordingly to read "organophosphorus-lithium salt synergy + dual mechanism of condensed-phase char formation / gas-phase flame retardancy + transparency compatibility" (in the original "phosphorus-nitrogen synergy + transparent compatibility", "phosphorus-nitrogen synergy" is not recorded on this grade's body page—the word "nitrogen" has 0 hits, and this has been corrected). (Data source: product handbook / official product data)

Transparency route and flame retardant pathway (handbook Features 3 / 5, verbatim): "unlike the high opacity problem of traditional powder flame retardants, this product is a modified transparent phosphorus-based powder and causes only about 20% light transmittance loss"; "dual mechanism of condensed-phase char formation + gas-phase flame retardancy, can rapidly increase the limiting oxygen index of the material". The product's compounding attribute is also recorded verbatim: "This product is a dripping-type flame retardant; where non-dripping is required, this product can only be used as a flame retardant synergist in combination." (Data source: product handbook / official product data)

1. Condensed-phase char formation — Char layer barrierPromotes char formation during combustion; the char layer blocks the transfer of oxygen and heat (mechanism statement in handbook Feature 5).
2. Gas-phase flame retardancy — Inhibition of chain reactionsGas-phase flame retardancy works in synergy with char formation to rapidly increase the limiting oxygen index of the material (mechanism statement in handbook Feature 5).
3. Transparent compatibility — Low light transmittance loss routeModified transparent phosphorus-based powder causes only about 20% light transmittance loss, meeting the needs of semi-transparent flame retardant products (handbook Feature 3).
4. Formulation pairing — Compounding as needed"Can be combined with charring agents and anti-dripping additives to further improve the V0 pass rate and anti-dripping performance." (handbook compounding recommendation, verbatim)

The core physicochemical indicators recorded in the official product data and the product handbook are as follows (enterprise-standard items are transcribed verbatim). The values in the table are as recorded in the materials; before bulk use, bench-scale verification with your own formulation is recommended.

Reading notes: 1) The two solubility records contradict each other (product handbook "soluble in water" / official product data "insoluble in water"); this table transcribes the current wording of the official product data, registering both side by side; 2) Two wordings coexist for the core component ("xylene" / "dimethylbenzene"); this page transcribes the wording of the main component field, without making any unifying inference; 3) The "lithium ion active content" column is a non-numeric item, and its measurement basis is to be confirmed; 4) The values in the table are as recorded in the materials; before bulk use, bench-scale verification is recommended. (Data source: product handbook / official product data)

The recommended dosage for this grade is tiered by substrate: TPU 2%–7% (of which polyester type 2-4%, polyether type 5-7%), PETG 1.5%–3%, PET 1.5%–3%, with the note "fine-tune according to article thickness and flame retardant rating requirements." The denominator basis is not stated in the materials — this page transcribes the tiers as recorded, does not presume a denominator, and does not convert across substrates.

The logic of the tiers is differentiation by substrate and TPU type: polyether-type TPU and polyester-type TPU have different recommended ranges (5-7% and 2-4%), while PETG and PET are the same (1.5%–3%). The materials also note that fine-tuning is required according to article thickness and flame retardant rating requirements; the denominator basis for the dosage is not stated in the materials, and the tiers must not be converted into one another.

To be verified: 1) The dosage denominator basis (relative to resin mass / total system mass) is not stated in the materials; 2) Measured data points are not given (substrate × thickness → dosage → rating); 3) All of the above are values as recorded in the materials; for actual production, please confirm by bench-scale testing with your own substrate and article thickness.

The official applicable substrates are the three classes of thermoplastic polymer materials PET, PETG, and TPU; the itemized list from the handbook's [Scope of Application] is transcribed as follows.

PET

Flame retardant film, sheet, spinning, thread.

PETG

Flame retardant transparent panels, decorative profiles, thick packaging sheets, optical semi-transparent parts.

TPU

Flame retardant cable sheathing, flame retardant film, hoses, footwear materials, elastomer products.

Scenario supplement

Feature 4 records "suitable for chemical fiber, wire, film, and other compliant products"; the page's scenario bar lists the same: PET flame retardant film·sheet / PET spinning·thread / PETG transparent panels / optical semi-transparent parts / TPU cable sheathing·hose / TPU footwear·elastomer.

Process and feeding

Conventional extrusion, injection molding, and pelletizing processes suffice: "no additional equipment modification is needed; standard processes are sufficient; low-temperature mixing and uniform-rate extrusion are recommended to ensure complete dispersion of the powder"; the feeding method is direct powder addition and mixing (see the "Reference Dosage Window" section).

Processing temperature window (by substrate)

PET 230–280℃ / PETG 190–250℃ / TPU 160–225℃; Feature 2 records "does not decompose, yellow, or smoke during high-temperature processing".

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

R912's comparative position in the flame retardant series: the series description "from transparent halogen-free to brominated synergist — covering all PE / PP / PET / PETG scenarios". For selection within the series, first look at the substrate, then at the transparency grade and flame retardant mode. The comparison is as follows:

Reading notes: (1) R218 belongs to the "flame retardant synergist" category (partial replacement for antimony trioxide), not a halogen-free flame retardant main agent, and is not included in this comparison table; (2) R912 and R915 share the "transparent" selling point but differ in substrate coverage (R912 includes TPU, R915 does not); the two are divided by "substrate + transparency grade"; (3) the values in each row come from each grade's own documentation and are not interchangeable; (4) for selection, always defer to the official full name and the category field. (Data source: product handbook / official product data)

The following points come item by item from the documentation; items not listed in the documentation are not drafted here.

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

• Product handbook: all sections of this grade's technical data page (product overview / core physicochemical property table / five features / scope of application / process recommendations / packaging / storage conditions); the table-of-contents line and the company product overview sentence.
• Official product data: all fields of this grade (name, category, positioning, description, mechanism, application, parameters, main components, recommended dosage); flame retardant series entries (tagline / description / signature grades).

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

• The two solubility records contradict each other (soluble in water / insoluble in water): presented side by side; the documentation side is advised to unify its external wording.
• Mechanism field: corrected on 2026-10-06 according to the product specification (original "phosphorus-nitrogen synergy + transparency compatibility" → "organophosphorus-lithium salt synergy + dual mechanism of condensed-phase char formation / gas-phase flame retardancy + transparency compatibility") — this item is closed (decided, effective from 2026-10-06).
• Wording difference in the core component ("xylene" / "dimethylbenzene"): the main component field is reproduced verbatim; the documentation side is advised to unify it.
• The denominator basis for the addition amount (relative to resin / total system mass) is not stated in the documentation; measured points (substrate × thickness × addition amount → rating) are not given.
• Flame retardant rating evidence (test bars, thickness, testing institution, report number), specific LOI values, quantified transparency conditions, mechanical property retention rate, halogen content threshold — not given in the documentation.
• Handling protection items, shelf-life start-counting method, post-opening validity period — not listed on this grade's page and not drafted.