PET / PETG transparent halogen-free flame retardant masterbatchPolyol phosphate × super dispersant × PETG resin · 200-mesh filter, extrusion pelletised
A high-efficiency flame retardant developed for highly transparent polyester materials: it achieves UL94 V-0 while not affecting the light transmission or haze of the substrate at all — no whitening, no yellowing, no exudation during processing, ideal for optical-grade transparent products.
- 💎 Transparency completely unaffected
- 🔥 Flame retardant rating UL94 V-0
- 🌿 Halogen-free (no halogens / heavy metals)
- ✨ No exudation / no whitening
Product overview · the limits of transparency
The whitening, hazing and rainbow streaks of conventional flame retardants vs the optical-grade clarity of M915 — switch the optical bench to compare.
M915 is a compound of our own high-efficiency additive organophosphorus flame-retardant system (polyol phosphate), a super dispersant and PETG resin, produced by high-speed shearing and 200-mesh filtration with extrusion pelletising. The molecular structure of the active flame-retardant component matches the polarity of polyester closely, so the finished part shows no rise in haze and no loss of light transmission, completely solving the whitening, hazing and rainbow streaks caused by conventional flame retardants and perfectly suited to optical-grade transparent products.
Halogen-free, environment friendly, low smoke
A purely organophosphorus system that contains no halogens such as chlorine or bromine, nor antimony or heavy metals; it produces no toxic hydrogen halide smoke when burned and has a low smoke density, fully meeting IEC 61249, RoHS and REACH and other international halogen-free environmental and safety requirements.
Core performance advantages · five in one
Clarity retention × halogen-free low smoke × no migration × mechanical retention × high-temperature compatibility.
Outstanding clarity retention
No rise in haze, no loss of light transmission, completely solving whitening, hazing and rainbow streaks, suitable for optical-grade transparent products.
Purely organophosphorus system
No chlorine, bromine, antimony or heavy metals; no toxic hydrogen halide smoke when burned, meeting IEC 61249 / RoHS / REACH.
No exudation · no blooming
The high-molecular-weight polyol phosphate ensures compatibility: no blooming or exudation at room temperature or under 85/85 damp-heat ageing, with a clean, oil-free surface.
Minimal mechanical impact
Does not noticeably reduce impact, tensile or flexural performance and does not harm printing, bonding or heat sealing.
Covers 240–280℃
The thermal stability range fully covers PET/PETG processing temperatures: during extrusion, injection moulding and casting it will not decompose, smoke or discolour.
Technical specification · six at a glance
The exact dosage can be adjusted slightly according to product thickness, equipment and process and the co-additive system; a small trial is recommended.
Applicable substrates and typical applications
Four families of transparent products, with zero compromise on optical performance.
Lighting / electronic housings
Lighting housings, transparent electronic housings, cosmetic packaging, instrument windows and more.
Advertising light panels
Advertising light panels, decorative transparent boards, equipment protection panels.
Cast PET film
Cast PET film, high-clarity flame-retardant packaging film, optical protective film.
Tube / profile
Transparent flame-retardant polyester tubes, profiles and 3D printing PETG filament.
Processing guidance and precautions
Drying is the key prerequisite; process in the 240–275℃ window and never let the material dwell above the 290℃ red line.
Disclaimer · sample request
Submit the form and a technical consultant will contact you within 24 hours to arrange a sample.
Recommended dosage
01Product positioning
M915 belongs to the "functional masterbatch" category; its official full name is "PETG transparent halogen-free flame retardant masterbatch M915", and its series attribution is the functional masterbatch series. Handbook table-of-contents line, verbatim: "M915: PETG transparent halogen-free flame retardant masterbatch — PETG pipes, PETG films, injection-molded parts (phosphorus-nitrogen type)"; official tagline line "PETG pipes, films, injection-molded parts, transparent flame retardant". (Data source: product handbook / official product data)
[Product Overview] Verbatim: "The PETG transparent halogen-free flame retardant masterbatch is compounded from phosphorus-nitrogen flame retardant, hyperdispersant, PETG resin, etc., passed through high-speed shearing and a 200 mesh filter, then extruded and pelletized. The PETG transparent halogen-free flame retardant masterbatch can effectively flame-retard and achieve good transparency. It is mainly used in PETG pipes, PETG films, injection-molded parts and other products, and has a notable effect on the fire and flame retardancy of the products." (Data source: product handbook / official product data)
This product is in finished masterbatch form; the official record states "M915 internally uses R915 PET/PETG dedicated transparent halogen-free flame retardant" — the corresponding additive model on the powder side is R915; the official FAQ states "when a powder-side system is required, select the corresponding flame retardant model". (Data source: official product data)
Two substrate statements coexist: the handbook and the catalog focus on PETG; the official detail page writes "PET / PETG transparent halogen-free flame retardant masterbatch" and lists "homopolymer PET, modified PET, PETG copolyester". The two are presented side by side without choosing one. (Data source: product handbook / official product data)
- Transparency retention — the detail page states "after addition, the haze of the article does not increase and the light transmittance does not decrease"; processing shows "no whitening, no yellowing, no precipitation", suitable for transparent article scenarios.
- Halogen-free and low smoke — "pure organophosphorus system, free of halogens such as chlorine, bromine and antimony and of heavy metals"; on burning there is no halogenated toxic smoke and smoke density is low.
- Non-migrating — a high-molecular-weight flame retardant system, "no frost precipitation at room temperature or under dual 85 damp-heat aging, and no oil mist on the surface".
- Minimal mechanical impact — "does not noticeably reduce impact, tensile or flexural properties, and does not impair printing, bonding or heat-sealing performance".
- High-temperature compatibility — the thermal stability range covers the processing temperatures of PET/PETG; "no decomposition, no fuming and no discoloration in extrusion, injection molding or casting".
- Retestable indicators — specific gravity 1.21 g/cm³ and melt index 62.8 g/10min; these two retestable indicators can be checked batch by batch.
02Formulation system & mechanism of action
Composition and process verbatim: "The PETG transparent halogen-free flame retardant masterbatch is compounded from phosphorus-nitrogen flame retardant, hyperdispersant, PETG resin, etc., passed through high-speed shearing and a 200 mesh filter, then extruded and pelletized." The composition statement on the official detail page is "a high-efficiency additive-type organophosphorus flame retardant system (polyol phosphate ester), hyperdispersant, PETG resin, etc., compounded and, after high-speed shearing and a 200 mesh filter, extruded and pelletized" — presented side by side with the handbook's single statement "phosphorus-nitrogen flame retardant" (both are qualitative differences of the system); this page presents them side by side without choosing one; the formulation route is subject to the technical documents accompanying the shipment. (Data source: product handbook / official product data)
Transparency mechanism sentence (detail page): "The molecular structure of the built-in effective flame retardant component is highly matched to the polarity of the polyester; after addition, the haze of the article does not increase and the light transmittance does not decrease." Quantitative data (light transmittance / haze percentage) is not provided in the source material; this page relays it qualitatively. (Data source: official product data)
Data boundaries: the handbook page for this model does not elaborate the combustion mechanism (does not mark attributes such as "dripping type") and does not give the oxygen index (LOI) — this page does not draft them on its own behalf and does not transplant the mechanism statements of other models. (Data source: product handbook)
- Polarity matching — compatible with polyester systemsThe molecular structure of the flame retardant component is highly matched to the polarity of the polyester: after addition, haze does not increase and light transmittance does not decrease (detail page statement).
- Flame retardancy — additive-type organophosphorus systemThe flame retardant serves as the main body to impart flame retardant performance; achieves UL94 V-0 (the handbook indicator table and the official field give the same value).
- Dispersion — 200 mesh filter pelletizing"High-speed shearing and a 200 mesh filter, then extruded and pelletized" — dispersion is completed in the pelletizing stage, and the customer simply blends it in.
- Non-migrating · mechanically friendly — end-use performanceThe high-molecular-weight flame retardant system shows no frost precipitation; it does not noticeably reduce impact, tensile or flexural properties, and does not affect printing, bonding or heat sealing.
03Key parameters
Items recorded in the handbook specification table and official product data are transcribed as follows (three coexisting sets of stated figures for processing temperature are registered; the values in the table are as recorded in the source documents, and small-batch trial verification is recommended before bulk use).
| Item | Value / description |
|---|---|
| Main component | Phosphorus-nitrogen flame retardant, hyperdispersant, PETG resin |
| Addition ratio | 6%-10% |
| Processing temperature | < 280 °C |
| Flame retardant performance | UL94 V-0 |
| Specific gravity | 1.21 g/cm³ |
| Melt index | 62.8 g/10min |
| Processing temperature (coexisting stated figures) | Handbook and official fields: <280℃; detail page: processing window 240–275℃, prolonged residence at high temperature above 290℃ prohibited (to avoid slight thermal degradation and yellowing of the flame retardant components) |
| Process keywords | High-speed shear + 200 mesh filter screen + extrusion pelletizing |
| Flame retardancy and compliance (qualitative) | Pure organophosphorus system, containing no chlorine, bromine, antimony or other halogens and no heavy metals; on combustion, no halogenated toxic smoke and low smoke density; compliance statements include IEC 61249, RoHS, REACH |
| Migration behavior | At room temperature and under dual 85 damp-heat aging: no frost precipitation, no oil mist on the surface |
| Appearance | Not listed in the source documents (recorded neither on this grade's page nor on the detail page) — not filled in with values from other grades of the same series |
Reading notes: 1) Three sets of stated figures for processing temperature coexist (upper limit <280℃ / processing window 240–275℃ / prolonged residence above 290℃ prohibited); this table registers them in parallel and does not select one; 2) the test conditions (temperature, load) for the melt index 62.8 g/10min are not listed in the source documents; 3) no complete physical and chemical specification table is attached for this grade (appearance, moisture content, melting point, decomposition temperature, etc. are not listed) — not drafted in its place; 4) the values in the table are as recorded in the source documents; small-batch trial verification is recommended before bulk use. (Data source: product handbook / official product data)
04Recommended dosage window
Handbook specification table [Addition ratio]: 6%-10%; the denominator is the internal addition ratio — "for example, taking 5% masterbatch addition: 95% raw material + 5% masterbatch = 100%", calculated on the total mass of the resin system. The detail page records "the specific addition amount may be slightly adjusted according to product thickness, equipment process and synergistic system" and "determination by small-scale trial is recommended".
| Scenario | Dosage | Conditions & notes |
|---|---|---|
| PETG / PET system (internal addition) | 6% – 10% | Same value as the [Addition ratio] in the handbook specification table and the official dosage field; denominator = total mass of the resin system (internal addition: raw material + masterbatch = 100%) |
The source documents for this grade give no directional clause for "thickness–dosage" (no statement of "thinner = more addition / thinner = less addition") — the thickness-direction rules of other grades do not apply to this product. The detail page only states "may be slightly adjusted according to product thickness, equipment process and synergistic system" and "determination by small-scale trial is recommended". Fixed-ratio method (general rules): when samples are sufficient, try several formulations and select the best; when samples are only sufficient for one trial, use the highest recommended addition ratio; for the first trial, do not add other auxiliaries or additives. Actual measured application points (thickness × addition amount × rating) are not given in the source documents, and this page does not extrapolate them.
To be verified: 1) the thickness–dosage direction is not given in the source documents (this grade has no such clause); 2) actual measured points (thickness × addition amount → rating) are not given in the source documents; 3) the above are as recorded in the source documents; for actual production, please conduct a small-scale trial confirmation in combination with your own polyester grade and equipment process.
05Applications
The official application list is "PETG flame retardant / transparent PET products / PETG tubing / PETG film"; the official detail page gives four application groups, and the handbook overview scenarios are PETG tubing, PETG film, injection-molded parts and other products — transcribed as follows.
- Transparent injection-molded parts
- Lighting housings, transparent electronic housings, cosmetic packaging, instrument windows.
- Extruded transparent sheet / board
- Advertising light-transmitting panels, decorative transparent sheets, equipment protective panels.
- Films
- Cast PET film, high-transparency flame-retardant packaging film, optical protective film.
- Other profiles
- Transparent flame-retardant polyester tubing, profile shapes, 3D printing PETG filament.
- Handbook overview scenarios
- PETG tubing, PETG film, injection-molded parts and other products.
- Feeding and screw (detail page)
- Masterbatch and raw material are high-speed mixed and then fed directly to the machine; compatible with "low-shear screw dedicated to polyester"; for the pre-drying stated figures, see the "Use, Storage and Transportation" section.
Field issues & application examples (as recorded in the source material)
| Field issue | What the source material states |
|---|---|
| Is there really no haze in transparent products? | The detail page records "no increase in haze and no decrease in light transmittance of the product after addition" and "no whitening, no yellowing, no exudation during processing"; quantitative data (light transmittance / haze percentage) are not given in the source documents; for products with high optical requirements, a small-scale trial comparison is recommended first. |
| What is the difference from R915? | The official record states "M915 uses R915 internally" — M915 is a finished masterbatch-line product (addition 6%-10%, dispersion completed at the pelletizing stage), while R915 is a flame-retardant-line raw material (powder, added at 1%–4%, pre-mixed by the customer). Both grades are named with 915, but their form and dosage basis differ; before inquiry, sample request and production line switching, confirm the form and dosage basis first. |
| How should the processing temperature be controlled? | The handbook and official fields give an upper limit of <280℃; the detail page gives a processing window of 240–275℃ and draws a red forbidden line — prolonged residence at high temperature above 290℃ is prohibited, to avoid slight thermal degradation and yellowing of the flame retardant components. "The processing temperature must not exceed the maximum temperature recommended in the product introduction, otherwise the properties of the masterbatch will be damaged." |
| How should the drying conditions be determined? | Two sets of stated figures are given in parallel: the general rules' separate material-drying figures for PETG "80 degrees for 5 hours"; the detail page's pre-processing figures "120℃ drying for 4–6 h, moisture ≤0.03% (to prevent whitening from hydrolysis during processing)". The two are given in parallel; confirm according to your own equipment and process. |
06How it differs from related grades
Within the functional masterbatch series, first match by substrate: PE→M911 / PETG→M915 / PA6→M918 / PP→M933; then look at grade, transparency statement and processing conditions. The comparison is as follows:
| Model | Substrate · Positioning | System | Addition ratio | Grade · Processing |
|---|---|---|---|---|
| M915 | PETG · Transparent halogen-free flame retardant masterbatch | Phosphorus-nitrogen flame retardant (detail page statement: polyol phosphate ester) + hyperdispersant + PETG resin (200 mesh filter) | 6%-10% (internally added) | UL94 V-0; <280℃ (detail page 240–275℃); specific gravity 1.21 g/cm³ |
| M911 | PE · Halogen-free flame retardant masterbatch | Hindered amine flame retardant + light stabilizer + LLDPE resin | 10%-25% (the thinner (5–10 si), the higher the ratio) | UL94V1 / UL94 V-2 film grade; <250℃ |
| M918 | PA6 · Halogen-free flame retardant masterbatch | Phosphate + hyperdispersant + PA6 resin (350 mesh filter) | 8%-12% | UL94 V-0; <325℃; specific gravity 1.22 g/cm³; dripping type |
| M933 | PP · Halogen-free V0 flame retardant masterbatch | Phosphorus-based + small amount of synergist (surface-coated, PP carrier) | 15-25% (the thinner the thickness, the smaller the addition ratio) | Records state it meets halogen-free, melamine-free and sulfate-residue-free |
| M922 | PP · Flame retardant masterbatch (low-halogen) | Phosphorus, nitrogen and bromine compound (antimony-free) | homopolymer 3.5% / blend 4%-6% / copolymer 8% | UL94 V2; specific gravity 1.10 g/cm³ |
Reading notes: ① The thickness-dosage direction follows each model's own documented statement—this model's documentation gives no direction (the two opposing rules of M911 "the thinner, the higher the ratio" and M933 "the thinner the thickness, the smaller the addition ratio" both do not apply to this product); ② M922 follows the low-halogen statement and is not combined with this product (halogen-free) in wording; ③ Values in each row come from that model's own documentation and are not interchanged; ④ The same-numbered model in the additive line is R915 (the internal correspondence is explicitly stated). (Data source: product handbook / official product data)
07Usage & storage
The following points are taken item by item from the documentation; items not listed in the documentation are not drafted on its behalf.
Dosage and ratio determination
- Internal addition ratio: 6%-10% (the handbook specification table and the official field give the same value).
- Detail page: may be adjusted slightly according to article thickness, equipment process and synergistic system; a small-scale trial is recommended to determine it.
- Ratio determination method (general rules): if sample is sufficient, try several formulations and select the best; if only enough for one run, use the highest recommended addition ratio; for the first trial, add no other auxiliaries / additives.
Processing and use
- Processing temperature: upper limit <280℃; detail page processing window 240–275℃, prolonged high-temperature residence above 290℃ is prohibited.
- Feeding: mix the masterbatch and raw material at high speed, then feed directly to the machine; compatible with the low-shear screw dedicated to polyester.
- Drying: general rules 80℃×5 hours (PETG); detail page pre-drying at 120℃ for 4–6 h, moisture ≤0.03%. Both are listed side by side.
Moisture-proof clause
- Store any remaining unused masterbatch in a sealed container to prevent moisture from affecting its next use.
Not stated in the documentation (not drafted on this page)
- Packaging, shelf life and storage conditions (not listed on this model's page; statements from other models of the same series are not applied); accompanying document description (not listed on this model's detail page)—please request the accompanying technical documents for the specific item number.
08FAQ
Is M915 truly halogen-free?
Yes. The product name "PETG transparent halogen-free flame retardant masterbatch M915", the English name (Halogen-free) and the official detail page "pure organophosphorus system, free of halogens such as chlorine, bromine and antimony, and of heavy metals" corroborate each other in three places; combustion produces no halogenated toxic fumes and low smoke density; compliance statements include IEC 61249, RoHS, REACH. (Data source: product handbook / official product data)
How much is added?
Internal addition ratio 6%-10% (denominator = total mass of the resin system: raw material + masterbatch = 100%); it may be adjusted slightly according to article thickness, equipment process and synergistic system; a small-scale trial is recommended to determine it.
Do thick articles and thin articles require a change in dosage?
This model's documentation gives no directional clause for "thickness-dosage" (there is neither a statement of "thinner means more addition" nor "thinner means less addition"); the thickness-direction rules of other models do not apply to this product; the specifics are to be determined by a small-scale trial.
Is the substrate PETG or PET?
Both appear: the handbook and catalogue focus on PETG; the official detail page writes "PET / PETG" and lists homopolymer PET, modified PET and PETG copolyester. Both are listed side by side, without choosing one; please confirm the applicable boundary with the supplier.
What is its relationship with R915?
The official record states "M915 internally uses R915, a transparent halogen-free flame retardant dedicated to PET/PETG"—M915 is a finished masterbatch-line product (6%-10% loading, dispersion completed during pelletizing), while R915 is a powder additive (1%–4% loading, pre-mixed at the customer side). Their form and dosage basis differ, and they are not interchangeable.
What are the specific gravity and melt index?
Specific gravity 1.21 g/cm³, melt index 62.8 g/10min (the handbook specification table and the official field give the same values; both can be retested). The test conditions for the melt index are not listed in the documentation. (Data source: product handbook / official product data)
AppendixData sources
The data on this page come from two types of documentation and are traceable item by item:
- Product handbook: the catalogue row, specification table and general-rule clauses of the masterbatch booklet in which this model appears (internal-addition denominator basis, general processing-temperature rules, drying clause, moisture-proof clause).
- Official product data: all fields for this model (name, category, tagline, description, applications, parameters, main components, addition ratio); the functional masterbatch series entries and FAQ; the official detail page copy.
Not covered by the source material (not written on this page — to be added later)
- Halogen-free determination threshold (halogen ppm value) and third-party test report number—the documentation provides only qualitative statements.
- Quantitative data for light transmittance / haze and mechanical retention—the detail page gives only qualitative statements.
- Test specimen, specimen thickness and testing organization for UL94 V0—not stated in the documentation.
- Test conditions for the melt index 62.8 g/10min (temperature, load)—not listed in the documentation.
- The relationship among the three processing-temperature statements (upper limit <280℃ / processing window 240–275℃ / no prolonged residence above 290℃)—applicable conditions to be confirmed.
- Difference in substrate statements (handbook PETG vs detail page PET / PETG)—applicable boundary to be confirmed by the product side.
- Difference in drying statements (general rules 80℃×5h vs detail page 120℃ 4–6h)—applicable conditions to be confirmed.
- Missing items in the complete physicochemical specifications: appearance, moisture content, melting point, decomposition temperature, etc. (no specification table is attached for this model).
- The ratio and process for "M915 internally uses R915"—the official data gives the correspondence but does not elaborate.
- Packaging, shelf life and storage conditions—not listed on this model's page, not drafted on its behalf.