PP halogen-free V0 flame-retardant masterbatchWhite cylindrical pellets · phosphorus synergy · special surface coating
A high-efficiency phosphorus flame retardant is compounded with a small amount of synergistic additives and given a special surface coating, then mixed and pelletised with a PP carrier; this overcomes the traditional phosphorus drawbacks of high water absorption and poor compatibility, keeping flame-retardant efficiency very high while preserving the mechanical properties of the resin to the greatest extent.
- ✓ Halogen-free / melamine-free
- ✓ No residual sulphate
- 🔥 UL94 V0 (measured on 0.4 mm sheet)
- 💧 Low water absorption · easy processing
Coated pellet · the source of low water absorption
Toggle the comparison: traditional phosphorus absorbs water and hydrolyses, while the M933 coating makes droplets bead up; hover the cross-section to see the three layers.
Phosphorus synergy · special surface coating
M933 is made by compounding a high-efficiency phosphorus flame retardant with a small amount of synergistic additives, then applying a special surface coating treatment, and finally mixing and pelletising with a polypropylene (PP) carrier.
Overcomes high water absorption and poor compatibility
Developed for demanding PP flame-retardant applications, it overcomes the high water absorption and poor compatibility of traditional phosphorus flame retardants; the coating process gives it excellent dispersion in the resin and avoids the problems caused by hydrolysis and moisture pick-up.
Flame retardancy and mechanical properties together
While keeping very high flame-retardant efficiency it minimises the effect on the mechanical properties of the resin itself; compatibility with PP resin is improved, dispersion is extremely easy, and finished parts keep a high level of mechanical performance.
Specification and physical indicators · six tiles
The two-column parameter table transposed into six tiles.
Main benefits and advantages
Environment / efficiency / processing / mechanics — four dimensions.
Three-free environmental compliance
Fully complies with the halogen-free (Halogen-free) and melamine-free (Melamine-free) requirements and leaves no residual sulphate.
High flame-retardant activity
The flame-retardant activity is high, so compared with ordinary flame retardants the dosage can be reduced.
Coating lowers water absorption
The special surface coating effectively lowers the water absorption of the powder and greatly improves the melt flow of plastics, avoiding the problems caused by hydrolysis and moisture pick-up.
High mechanical retention
It improves compatibility with PP resin and is extremely easy to disperse, so finished parts keep a high level of mechanical performance.
Applications · thickness–dosage curve
Thinner is better for flame retardancy: a 0.4 mm sheet with 25 phr measured V0 (cotton does not burn).
High-end FR PP products
Suitable for polypropylene parts facing demanding environmental requirements.
Board and sheet industry
PP boards, extruded sheet, thermoformed packaging and the like.
Spinning industry
PP flame-retardant fibre, nonwovens and chemical fibre spinning.
Reference dosage × thickness relationship (qualitative indication)
Packing and storage · sample request
25 kg with a double-layer PE moisture barrier; samples answered within 24 hours.
Packing and storage
01Product positioning
M933 belongs to the "functional masterbatch" category; its official full name is "PP Halogen-free V0 Flame Retardant Masterbatch M933", and it belongs to the functional masterbatch series. The handbook table of contents line verbatim: "M933: PP halogen-free flame retardant masterbatch — high-end flame retardant PP requirements: sheet, spinning, etc."; the official positioning line "high-end flame retardant PP requirements: sheet, spinning, etc.". (Data source: product handbook / official product data)
[Product Overview] verbatim: "M933 flame retardant masterbatch is produced by compounding a phosphorus-based flame retardant with a small amount of synergist, followed by surface coating treatment and thorough mixing with a PP carrier and pelletizing." (Data source: product handbook / official product data)
The handbook [Applications] line verbatim: "suitable for high-end flame retardant PP requirements, especially in sheet, spinning and other industries." Detail page application breakdown: thin board and sheet (PP board, extruded sheet, blister packaging); spinning (PP flame retardant fiber, nonwoven fabric and chemical fiber spinning). Applicable process notes: extrusion / calendering / spinning. (Data source: product handbook / official product data)
Flame retardant rating and measured data points: the product name contains "V0"; the official detail page records "UL94 V0 (measured on 0.4mm sheet)", and the V0 criterion is stated as "molten drips do not ignite absorbent cotton (meets UL94 V0 standard)"; the handbook application experiment records "in a PP sheet with a thickness of 0.4mm, with 25 parts of this product added, drips do not burn cotton". (Data source: product handbook / official product data)
- Environmental compliance statement (handbook main efficacy verbatim) — "This product can meet the requirements for halogen-free and melamine-free, and can also meet the requirement of no residual sulfate".
- Flame retardant efficiency — "higher flame retardant efficiency, the addition ratio can be relatively lower".
- Processing performance — "after surface treatment, the powder water absorption rate is effectively reduced, improving processing performance".
- Mechanics and dispersion — "improved compatibility with resin, easy to disperse, and the resulting product has relatively better mechanical properties".
- Advantages line (handbook) — "environmentally friendly, low addition amount, easy to process, good physical and mechanical properties".
- Pre-use note — "the thinner the product thickness, the better the flame retardant effect and the smaller the addition ratio; the actual dosage shall be based on the customer's actual results".
02Formulation system & mechanism of action
Composition and process verbatim: "M933 flame retardant masterbatch is produced by compounding a phosphorus-based flame retardant with a small amount of synergist, followed by surface coating treatment and thorough mixing with a PP carrier and pelletizing." (Data source: product handbook / official product data)
Design intent and coating structure (official detail page): the comparison point is "overcoming the defects of traditional phosphorus-based systems of high water absorption and poor compatibility"; the three-layer structure of the coated pellet is coating layer (special surface coating) / phosphorus-based compounded flame retardant layer / PP carrier; the coating effect is stated as "the coating layer repels water → water droplets bead up and roll off · water absorption ↓ · processing fluidity ↑". (Data source: official product data)
Data boundary: the entry for this grade does not provide an expanded description of the combustion mechanism — this page does not fabricate a mechanism or transplant the mechanism descriptions of other grades. (Data source: product handbook)
- Phosphorus-based compounding — flame retardant main bodyA phosphorus-based flame retardant compounded with a small amount of synergist serves as the flame retardant main body, subjected to surface coating treatment.
- Surface coating — reduce water absorption and improve flow"after surface treatment, the powder water absorption rate is effectively reduced, improving processing performance"; the coating layer repels water, "water droplets bead up and roll off".
- Compatibility and dispersion — pelletizing with PP carrier"improved compatibility with resin, easy to disperse, and the resulting product has relatively better mechanical properties".
- Flame retardancy achieved — V0 criterion"molten drips do not ignite absorbent cotton (meets UL94 V0 standard)"; in the application experiment, 0.4mm PP sheet with 25 parts added "drips do not burn cotton".
Manual headline benefits · 4
03Key parameters
Items recorded in the handbook and official product data are transcribed as follows; this grade's entry does not include a physical and chemical property table — no blank values are filled in and no values are drafted in their place (the values in the table are as recorded in the source; small-scale trial verification is recommended before use).
| Item | Value / description |
|---|---|
| Main component | Phosphorus-based flame retardant compounded with a minor proportion of synergist, surface-coated, PP carrier |
| Appearance | White cylindrical pellets |
| Flame retardant rating | UL94 V0 (the official detail page records "UL94 V0 (measured on 0.4mm sheet)"); V0 criterion: drips do not ignite absorbent cotton |
| Packaging | 25 kg/bag (PE double-layer bag; the official record reads "double-layer PE moisture-proof inner-liner bag") |
| Storage | Cool, dry place, moisture-proof (the official data separately records "protect from light and moisture" — the two are listed side by side) |
| Maximum processing temperature | Not listed in the source (not recorded in this grade's entry; values from other grades of the same series were not applied by analogy) |
| Physical and chemical properties (density · moisture content · melting point · melt index · decomposition temperature) | Not listed in the source (this grade has no property table attached) — no values are drafted in their place |
| Oxygen index (LOI) | Not given in the source |
Reading notes: 1) This grade has no physical and chemical property table attached (density, moisture content, melting point, melt index, decomposition temperature, etc. are not listed) — no values are drafted in their place; 2) The maximum processing temperature is not listed in the source, and the General Provisions require "no higher than the maximum temperature recommended in the product introduction"; 3) For UL94 V0, the test specimens, testing institution, and judgment report number are not recorded in the source (the measured point is given only for 0.4mm sheet); 4) The values in the table are as recorded in the source; small-scale trial verification is recommended before use. (Data source: product handbook / official product data)
04Recommended dosage window
Handbook [Reference Dosage], verbatim: "15-25%; 1. For this product, the addition ratio is recommended according to the thickness of the customer's product; 2. The thinner the product, the better the flame-retardant effect and the smaller the addition ratio; the actual dosage is subject to the customer's actual results; 3. In application experiments, in a PP sheet with a thickness of 0.4mm, when 25 parts of this product is added, the drips do not burn cotton." The denominator basis is the internal addition ratio (raw material + masterbatch = 100%).
| Scenario | Dosage | Conditions & notes |
|---|---|---|
| PP system (internal addition) | 15% – 25% | Handbook [Reference Dosage]; denominator = total mass of the resin system (internal addition: raw material 95% + masterbatch 5% = 100% basis); "the addition ratio is recommended according to the thickness of the customer's product" |
| Thickness direction (source basis) | The thinner, the smaller the addition ratio | Handbook, verbatim: "The thinner the product, the better the flame-retardant effect and the smaller the addition ratio; the actual dosage is subject to the customer's actual results" |
| Application measured point | 0.4mm sheet + 25 parts | "In a PP sheet with a thickness of 0.4mm, when 25 parts of this product is added, the drips do not burn cotton" — corresponds to the official "UL94 V0 (measured on 0.4mm sheet)" |
The dosage direction is "the thinner the thickness, the smaller the addition ratio" (handbook reference dosage) — this may be opposite to the direction of certain grades of the same series; each grade follows its own source basis, and values are not cross-applied. The range comparison with M922 is a grade-selection engineering variable: the two products each have independent ranges, and values are not cross-applied. Fixed-ratio clause (General Provisions): try several formulations and select the best; when the sample is only sufficient for one trial, add at the highest recommended dosage; for the first trial, do not add other auxiliary materials / additives.
To be verified: 1) The measurement basis of "25 parts" in the application experiment (its correspondence with the 15-25% reference dosage) is not stated in the source; 2) The thickness-dosage direction is the source's original basis (thinner = lower dosage), and the rules of other grades do not apply; 3) The above are values as recorded in the source; for actual production, please conduct small-scale trial confirmation in combination with your own PP grade and product thickness.
05Applications
The official application list is "PP sheet / chemical fiber"; the detail page's application breakdown is transcribed as follows; the handbook's use line is positioned as "high-end flame-retardant PP requirements, especially sheeting, spinning and other industries".
- High-end flame-retardant PP products
- Handbook use positioning: "suitable for high-end flame-retardant PP requirements".
- Thin boards and sheets
- PP board, extruded sheet, blister packaging.
- Spinning
- PP flame-retardant fiber, non-woven fabric, and chemical fiber spinning.
- Applicable processes
- Extrusion / calendering / spinning (noted on the detail page).
- Flame-retardant performance (measured records)
- 0.4mm PP sheet + 25 parts: drips do not burn cotton (handbook application experiment); official marking "UL94 V0 (measured on 0.4mm sheet)".
- Formulation notes
- "Higher flame-retardant efficiency, so the addition ratio can be relatively lower"; the surface coating improves the water absorption rate and processing flowability. The details of compatibility with other additives are not given in the source.
Field issues & application examples (as recorded in the source material)
| Field issue | What the source material states |
|---|---|
| Is M933 truly halogen-free? | Yes. The product name "PP Halogen-Free V0 Flame-Retardant Masterbatch M933", the English name (Halogen-Free), and the handbook's efficacy statement "This product can meet halogen-free and melamine-free requirements, and can also meet the requirement of no sulfate residue" corroborate each other in three places. (Data source: product handbook / official product data) |
| How much to add? Why is it said that thinner means less? | Reference dosage 15-25% (denominator = total mass of the resin system); the handbook states "the thinner the product, the better the flame-retardant effect and the smaller the addition ratio; the actual dosage is subject to the customer's actual results". The direction clause is transcribed as written, without conversion. |
| How to choose between this and M922? | The two have different directions: M922 follows a low-halogen basis (single-digit addition levels tiered by multiple PP types), while M933 follows a halogen-free phosphorus-based basis (15-25%, aimed at the high-end requirements of sheeting and spinning). Grade selection must be determined according to compliance requirements and product requirements; values are not cross-applied. |
| What is the maximum processing temperature? | This grade's entry does not list a maximum processing temperature — this page does not draft one in its place; the General Provisions require "the processing temperature must not be higher than the maximum temperature recommended in the product introduction, otherwise the masterbatch's performance will be damaged". |
06How it differs from related grades
The functional masterbatch series are matched by substrate: PP→M933 (or M922 for the low-halogen route) / PE→M911 / PETG→M915 / PA6→M918; the flame-retardant grades differ in their compliance positions (halogen-free / low-halogen); first select the route by compliance requirements, then select the grade by substrate and working conditions. Comparison as follows:
| Grade | Substrate · Direction | System | Addition ratio | Rating · Temperature |
|---|---|---|---|---|
| M933 | PP · halogen-free V0 flame retardant | Phosphorus-based + a small amount of synergist (surface-coated, PP carrier) | 15-25% (the thinner the thickness, the smaller the addition ratio) | UL94 V0 (measured on 0.4mm sheet); meets the halogen-free, melamine-free and sulfate-residue-free requirements |
| M922 | PP · flame retardant (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; processing temperature upper limit not listed |
| M911 | PE · halogen-free flame retardant | Hindered amine flame retardant + light stabilizer + LLDPE resin | 10%-25% (the thinner, the higher the ratio) | UL94V1 / UL94 V-2 film grade; <250℃ |
| M915 | PETG · transparent halogen-free flame retardant | Phosphorus-nitrogen flame retardant + hyperdispersant + PETG resin (200 mesh filter) | 6%-10% (thickness direction not given) | UL94 V-0; <280℃; specific gravity 1.21 g/cm³ |
| M918 | PA6 · halogen-free flame retardant | Phosphate + hyperdispersant + PA6 resin (350 mesh filter) | 8%-12% (thickness direction not given) | UL94 V-0; <325℃; specific gravity 1.22 g/cm³; dripping type |
Reading notes: 1) The thickness-dosage direction of each grade follows its own data position — for this grade, "the thinner the thickness, the smaller the addition ratio", which is opposite to M911's "the thinner, the higher the ratio"; the two are listed as-is and are not applied to each other; 2) M922 falls under the low-halogen position and M933 under halogen-free; the two terms are not merged; 3) The values in each row come from each grade's own data records and are not applied to one another. (Data source: product handbook / official product data)
07Usage & storage
The following points are taken one by one from the data records; items not listed in the data are not drafted on our behalf.
Reference dosage (transcribed in full)
- Dosage 15-25% (denominator = total mass of the resin system).
- "The addition ratio for this product is recommended according to the thickness of the customer's product".
- "The thinner the product thickness, the better the flame-retardant effect and the smaller the addition ratio; the actual dosage shall be based on the customer's actual results".
- Measured point: 0.4mm PP sheet + 25 parts → drips do not ignite cotton.
Processing and trial dosage
- The processing temperature upper limit is not listed in the data; the general provisions require "not higher than the maximum temperature recommended in the product data sheet".
- Trial-dosage clause (general provisions): try several formulations and select the best; if there is only enough for one trial, add at the highest recommended level; for the first trial, do not add other fillers / additives first, and add them gradually after success.
- Drying (general provisions): the resins listed in the separate drying clause do not include PP (not drafted on our behalf); the mixed-drying clause (mix the raw material and masterbatch evenly, then dry according to the original production process) may be referenced.
Packaging · Storage · Moisture protection
- Packaging: 25 kg/bag (double-layer PE bag; official record: "double-layer PE-lined moisture-proof bag").
- Storage: cool and dry place, moisture-proof (official record additionally notes "light-proof and moisture-proof").
- "Please seal and store any remaining unused masterbatch to prevent moisture from affecting the next use!"
Not listed in the data (not compiled on this page)
- Shelf life, physical and chemical property table (density / moisture content / melting point / melt index / decomposition temperature), LOI, quantitative mechanical data, RoHS / REACH conformity statements — not listed for this grade; please request the technical documents accompanying the goods by specific part number.
Masterbatch general rules · trials & drying · 2
08FAQ
Which compliance position does M933 fall under?
True halogen-free (phosphorus-based route): traced to three sources — product name / English name / handbook efficacy statement; the handbook states verbatim: "this product can meet the halogen-free and melamine-free requirements, and can also meet the sulfate-residue-free requirement".
What are the flame-retardant rating and the measured point?
UL94 V0 — the criterion is stated as "molten drips do not ignite absorbent cotton (meets the UL94 V0 standard)"; measured point: 0.4mm PP sheet + 25 parts → drips do not ignite cotton. Test specimens and report number are not listed in the data.
How much is added?
Reference dosage 15-25% (denominator = total mass of the resin system); the direction is "the thinner the product thickness, the better the flame-retardant effect and the smaller the addition ratio; the actual dosage shall be based on the customer's actual results".
How does it differ from M922?
Different compliance positions: M933 is halogen-free phosphorus-based (15-25%, aimed at high-end requirements such as sheet and spinning); M922 is low-halogen (phosphorus-nitrogen-bromine compound, tiered by multiple PP types). Their ranges and scenarios are independent and the values are not applied to each other; select the route by compliance requirements.
What is the processing temperature upper limit?
Not listed in this grade's entry — not drafted on this page; follow the general provisions requirement: "the processing temperature must not be higher than the maximum temperature recommended in the product data sheet, otherwise the masterbatch performance will be damaged".
What are the packaging and storage conditions?
Packaging 25 kg/bag (double-layer PE bag); store in a cool and dry place, moisture-proof (official record additionally notes "light-proof and moisture-proof"). Shelf life is not listed in the data. (Data source: product handbook / official product data)
AppendixData sources
The data on this page come from two types of sources and are traceable item by item:
- Product handbook: the full page of this grade's entry (title / overview / main efficacy / appearance / advantages / applications / reference dosage / packaging / storage conditions); the general provisions of the masterbatch series; comparison entries of the same series.
- Official product data: all fields of this grade (name, category, positioning line, description, application, parameters, main components, dosage); the functional masterbatch series entries; the official detail-page copy (coated-pellet structure, application segmentation, applicable processes, UL94 marking, packaging and storage).
Not covered by the source material (not written on this page — to be added later)
- Halogen-free determination threshold (halogen values at the ppm level) and third-party test report number — the data only state "can meet the halogen-free ... requirements".
- The determination methods and test values for the two items melamine-free and sulfate-residue-free — not listed in the data.
- Processing temperature upper limit — not listed in this grade's entry (all other flame-retardant masterbatches in the series list it).
- Missing items in the physical and chemical property table: density, moisture content, melting point, melt index, decomposition temperature, etc. — not attached for this grade.
- The test specimens, testing organization and determination report number for UL94 V0 — not listed in the data.
- The measurement basis of "25 parts" in the application experiment (its correspondence to the 15-25% reference dosage) — not stated in the data.
- Oxygen index (LOI) and quantitative mechanical data (tensile and impact retention rates) — not given in the data.
- The specific names and proportions of the phosphorus-based flame retardant and the synergist; the material and process of the surface coating layer; the specific resin type / grade of the PP carrier — not listed in the data.
- Regulatory conformity statements such as RoHS / REACH, report numbers, and shelf life — not listed in the data.