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改性PP能用在哪些产品上？十大领域 88 个件的用材地图

应用领域 发布时间: 2026-09-16 4397 阅读

What products can modified PP be used in? This materials map lists 88 downstream components across ten major fields, and provides the modification direction and key criteria for each component. But first, here’s an even more important point: no matter how wide the application of modified PP is, there are three boundaries that cannot be crossed — this article explains clearly what can be done, what cannot be handled, and when the material should be changed.

What products can modified PP be used in?

This is the question I am asked the most. The people asking fall into two categories: one is those who have just come into contact with this material and want to know how much work it can handle; the other is those who already have a specific piece in hand and want to confirm whether they are overthinking it.

Both types of people are prone to falling into the same pit: thinking that the application range of modified PP is a 'can do/cannot do' list, when in fact it is a ranking question.

Give the conclusion first.

1. First, to clarify: the boundary of modified PP applications is not about 'whether it can be done,' but about 'which line is allowed to fail.'

What products can modified PP be used in? From publicly available part-level lists, there are more than 80 downstream parts in just the top ten fields. But to be more precise: there are almost no parts that this material cannot be used for, only parts where the cost is not suitable.

The reason lies in its modification logic. PP itself is the cheapest, easiest to mold, and lowest density among general-purpose plastics. Its shortcomings are clearly threefold: limited heat resistance, limited rigidity, and flammability. The entire work of modification is to address these three shortcomings——fillers improve rigidity and dimensional stability, glass fibers enhance strength and heat resistance, toughening improves low-temperature impact resistance, and flame-retardant systems compensate for flammability.

The cost of replenishment is synchronous:

- Added filler, rigidity and shrinkage are stable, but impact and surface may chip

- Adding fiberglass increases strength and heat resistance, but anisotropy, weld lines, and surface fiber float come along with it

- Added flame retardant, achieved V-0, but mechanical loss is inevitable; it's not an issue of process capability.

So when determining whether a part can use modified PP, the correct question is not 'Can it?' but 'Among these criteria, which one are you willing to compromise on?' This sentence is the premise for reading the entire material selection map. If you can't answer it, any selection recommendation is just a guess.

A judgment that peers can't copy: the flame retardant content in modified PP generally ranges from 25-30%, whereas in many engineering plastic systems, the flame retardant addition is much lower. This is not a difference in formulation level; it is determined by the structure of PP—it has a limiting oxygen index of only about 17.5, so to make it non-flammable, you have to pile on enough. "Wanting V-0, high impact resistance, and low cost" simultaneously is inherently contradictory. When encountering such requirements, first discuss the priorities, then discuss the materials.

2. Ten Major Areas · 88 Items: Material Map of Modified PP

The table below is the core of the entire text. On the left are the fields and items, and on the right are the corresponding modification directions. To read it, look from top to bottom for the item you want to work on and see which column it falls into.

2.1 Distribution of the Number of Cases in the Top Ten Areas

fieldNumber of itemsMain modification directionsConditions for Undertaking
1. Automobiles and New Energy TransportationFifteenToughening, talc filling, glass fiber reinforcement, flame retardantGood
2. Photovoltaic · Wind Power · Energy Storage · Hydrogen EnergySevenHalogen-free flame retardant, glass fiber reinforced, weather resistantGood
3. Electronics, Electrical, Communications, SemiconductorsNineFlame retardant, antistatic/conductive, mineral-filledGood
4. Intelligent Equipment · Robots · ToolsEightGlass fiber reinforced, wear-resistant, coatedGood
5. Medical Care · Personal Care · Food · Daily NecessitiesElevenFood grade, medical grade, heat-resistant, toughenedGood
Six Footwear · Textile · Sports · OutdoorsSevenFoaming, EVA/POE Blending, Weather ResistanceGood
Seven Packaging·Office·Toys·FoamingEightThin-walled, high-flow, toughened, EPP foamPart
8 Building Materials · Waterproofing · Plumbing · BathroomEightPipe materials, mineral fillers, weather-resistant co-extrusionGood
9 Agriculture · Horticulture · Fisheries · ShipsEightWeather-resistant and UV-resistant, toughened, hydrolysis-resistantGood
Ten Aviation · Rail Transit · Security · SpecialSevenFlame-retardant low smoke, glass fiber reinforced, carbon fiber reinforcedPart

Text Version Conclusion: Among the ten sectors, the daily-use segment, which includes automobiles and home appliances, has the best conditions for receiving orders; in packaging, a portion (film materials, non-woven fabrics) goes through the dedicated channels of petrochemical plants, which cannot accept modified granules; aviation and rail transit have small usage and high barriers, and are long-term directions. In this table, the 'conditions for receiving orders' column is the one I recommend you prioritize—it determines whether, once people find the keywords, you actually have the products to match.

2.2 Material Map of 88 Items (Main Table)

fieldRepresentative itemModification DirectionKey criterion
CarBumper / SkinImpact-resistant copolymer EPDM/POE Talc 10-20 parts−30℃ notch impact, molded shrinkage rate
CarDashboard body / frameworkPP/EPDM-T20; Soft version uses PP-LGF20Odor level, modulus, scratch resistance
CarInner door panel / Upright trim panelPP/EPDM-T20 or PP/PE-TD16Stress whitening, light aging resistance
CarBattery Pack Top Cover / Module BracketGlass fiber reinforced Halogen-free flame retardantUL94 V-0, 850℃ Glow Wire, RTI
CarAir conditioner duct / air guide / fan bladesPP-GF20/GF30 ToughenedCreep, dynamic balance, 140°C short-term thermal load
CarRadiator Water Chamber / Expansion TankCopolymerized PP ToughenedEthylene glycol-resistant coolant, hydrolysis-resistant
New energyPhotovoltaic Junction Box / ConnectorWeather-resistant, halogen-free flame retardantOutdoor aging, V-0
New energyEnergy Storage Cabinet / Structural ComponentsHalogen-free flame retardant, glass fiber reinforcedV-0, heat-resistant, insulation
new energyInverter housingHalogen-free flame retardant PPV-0, CTI
Electronics and ElectricalElectrical Appliance Housing / BaseFlame-retardant PP (V-0 or V-2)Scorching Wire GWIT, CTI
Electronics and ElectricalSwitch and socket panelFlame-retardant mineral fillerCTI, resistance to leakage tracking
Electronics and ElectricalESD Carrier / TrayConductive or anti-static PPSurface resistance 10⁶-10⁹ Ω
Intelligent EquipmentFan blade / Fan wheelGlass fiber reinforced PPFatigue resistance, dynamic balance
Intelligent EquipmentPump body / Valve housingGlass fiber or mineral reinforcedCorrosion-resistant and water pressure-resistant
Intelligent EquipmentCasters / RollersWear-resistant PP TPU coatingWear and adhesive strength of coating peeling
Intelligent EquipmentTool handle rubber coatingPP SEBSSoft and hard interface integration
Medical and daily useSyringe cover / Surgical trayMedical-grade PPHaze, irradiation yellowing, ISO 10993
Medical daily useInfusion containerMedical-grade transparent copolymerHeavy metals, non-volatile substances
Medical daily useMicrowave Meal Box / Food ContainerFood-grade heat-resistant PPHeat resistant up to 120℃, migration compliant
Medical and daily useRefrigerator Inner Liner / Washing Machine Inner DrumSolvent-resistant toughening / Mineral reinforcementESC, -20 to -30℃ low-temperature shock
Shoe Materials and SportsSneaker midsoleFoamed PP-POE blendRebound, density
Shoe Materials and SportsShoe material blended matrixEVA/POE Modified PPHardness, wear resistance
Packaging foamThin-walled lunch box / containerPOE Toughened PPDrop-resistant, thin-wall filling
Packaging foamEPP foam partBead Foamed PPDensity, resilience, steam forming
Building material pipelinePPR hot and cold water pipesLow MFR high molecular weight β crystal nucleationLong-term hydrostatic extrapolation for 50 years
Building material pipelineDrain Pipe / Corrugated PipeMineral-filled PPRing stiffness, weather resistance
Building material pipelineSPC flooring substrateMineral-filled PPDimensional stability, shrinkage rate
Agriculture and FisheriesDrip irrigation tape / micro sprinklerUV-resistant PPAnti-aging, pressure-resistant
Agriculture and FisheriesFlower pots / Gardening toolsWeather-resistant PPOutdoor weather resistance, impact resistance
Air and rail transitInterior panels / trim piecesFlame-retardant low-smoke glass fiber PPSmoke density, V-0
Security SpecialEquipment housingFlame-retardant impact-resistant PPLow temperature shock, V-0

Text Version Conclusion: This table does only two things — it matches the parts with the modification direction, and it matches the parts with the criteria. You will notice that the criteria in the same column are tiered: for automotive parts, first check low temperature and odor; for electrical parts, first check flame retardancy and CTI; for pipes, first check long-term strength; for medical parts, first check performance after sterilization. If the criteria are chosen incorrectly, all subsequent plans are wasted — this is the most costly type of mistake in material selection.

3. For the same part, why do the three companies report different materials?

People often ask with three quotes: for the same dashboard frame, one quotes mineral-filled, another quotes glass fiber reinforced, and another says either is fine. So who's right?

All three are correct, because their default working conditions are different. The same part can fall on three different routes:

RouteMaterial FormGet whatThe price paid
Mineral filledPP Talcum Powder 10-30%Rigid, stable shrinkage rate, low costImpact decreases, density increases, surface is average
Glass fiber reinforcedPP fiberglass 20-30%Significant improvement in strength, modulus, and heat resistanceAnisotropy, weld line weakness, surface floating fibers
Flame retardant tougheningPP Halogen-free Flame Retardant ToughenedPass V-0, retain impactOverall mechanical performance decline, highest cost

Which option to choose depends on what this part is most sensitive to. Take a dashboard frame as an example: if the main failure is 'warping after installation or misaligned assembly holes,' the issue to address is shrinkage and anisotropy, so mineral-filled or long glass fiber-filled materials are appropriate; if the main failure is 'excessive odor after summer sun exposure,' the issue to address is a low-odor system, which has nothing to do with whether it is filled or not.

So when you see something, don't ask what material it uses first; first ask what the most common problems it has are.

4. To judge whether an item is worth investing in, ask three questions

This map has 88 pieces, but not all of them are worth doing individually. There are only three criteria for judgment:

First, would customers search this way? When customers look for materials, they use the terminology of their own factory, not the industry terms. The term 'battery module spacer' is used within the industry, but what customers actually search for is 'battery bracket material.' The form of the word is wrong; no matter how professionally it is written, no one will find it.

Secondly, can I handle the orders for this item? Some items are not procured through the modified pellet line. BOPP film, melt-blown fabric, spinning, capacitor film, multi-layer co-extruded fuel tanks—these are materials purchased by petrochemical plants, and the modified pellet line cannot supply them. Keywords with high search volume but impossible to fulfill, writing them would lower the commercial index of the account, which is worse than not writing them at all.

Third, does this item have independent criteria? If the key indicators, thresholds, and validation methods of two items are exactly the same, combining them into one article might actually make it more substantial—because you can make a horizontal comparison: 'Why are the thresholds different for different items under the same criteria?'

All three must pass to be worthy of a separate article. If one of the three does not pass, it should be merged with the adjacent section or written at the end.

A counterintuitive point: the number of items does not equal the number of articles. A list of 88 items, going through the three points above, usually converges to 50-60 independent questions. If you rigidly follow the number of items, you may end up writing one article for each of the six names of a bumper, resulting in six articles competing for the same word—a situation of undermining yourself.

5. Reverse honesty: For these items, modified PP should not be the first choice

After discussing what can be done, you must talk about what cannot be done. This is where the value of material selection judgment lies.

Item / RequirementWhy is modified PP not suitable?Which route should I take?
Above 150°C for long periodsThe upper limit of the load distortion temperature of PP is just that one line; there are also limits to raising it by adding fillers and reinforcements.Switch to a higher heat-resistant engineering plastic system
Requires A-level surface, no coating, high rigidity, all at the same timeNo-spray coating requires a fine surface, and high rigidity requires high filling; the two are in opposition.Design the exterior parts and structural parts separately, or change the material
Precision load-bearing structural components, requiring extremely low long-term creepThe creep of PP is structural and can only be alleviated through modification.The load-bearing parts use engineering plastics or metal
High transparency, high heat resistance, both requiredTransparency relies on lowering crystallinity, while heat resistance relies on increasing crystallinity; the two directions are opposite.See if you can accept a compromise on the haze, or change the material
Requires long-term exposure to strong oxidizing agentsThe erosion of PP by the medium is systematic.Select special corrosion-resistant materials according to the medium

The pattern is very clear: whenever 'requirements in two opposite directions appear simultaneously,' it indicates that this part should not be forcibly used with PP. When encountering such a demand, our approach is to clarify first, and then discuss whether a compromise is possible—forcing the next batch will ultimately result in them being reworked and returned.

6. What to touch when changing materials: a checklist to look at before you act

After the customer decides to try modified PP, the real concern is often not the performance, but 'do I need to change my current mold and process.' This table is recommended to be reviewed before changing the material.

Items to moveWhat needs to be confirmedWhat will happen if I don't do it?
Mold shrinkage rateThe difference in shrinkage rate between new material and original material—does it require mold adjustment?The dimensions are out of tolerance, and the assembly does not fit.
Gate and VentDoes the flow difference between fiberglass material and filler material require changing the gate?Insufficient filling, change in weld line position
Material Temperature and Mold TemperatureThe process windows of fiberglass material and filler material are differentSurface floating fibers, insufficient splice strength
DryFillers are usually not needed, and fiberglass materials are determined according to the specific system.Bubbles, silver threads
Pressure Holding and DemoldingDeformation and whitening caused by shrinkage differencesDeformation, extrusion strain
Color differenceNon-spray-painted parts must first confirm the color sampleBatch color difference controversy
Verification orderFirst, small sample physical comparison → then short-shot mold trial → then batch trial productionDirectly start batch operation on the computer, with all the risk placed on the final step

Text version conclusion: Material change involves three aspects: molds, process, and color difference, among which the verification sequence should be discussed first. Skipping the comparison of small samples and going straight to mold testing is equivalent to spending the cost in advance; skipping short shots and going directly to batch production means that a single failure results in the loss of the entire batch.

7. The parts of these items that are most prone to problems are often not the material.

There is a very typical type of failure in the industry: the material is fine, but the part has a problem. Public records document a case—odour testing of modified PP pellets was qualified, but the final plastic part exceeded the odour limit. Tracking through the supply chain, two reasons were found: too much mold release agent was used during injection molding, introducing off-odors, and the injection molding temperature was too high, causing partial decomposition of the material and generating odors. The study concluded that odour problems in plastic parts need to be addressed jointly by material manufacturers, component manufacturers, and OEMs.

Taking this matter a step further leads to a general judgment: for interior parts, the emission of particles meeting standards is one threshold, and the part itself meeting standards is another threshold. The industry commonly refers to the German VDA standards—Odor ≤ 3 (VDA 270), Formaldehyde ≤ 10 mg/kg (VDA 275), Condensable compounds ≤ 2 mg (VDA 278), Total Carbon TVOC ≤ 50 μgC/g (VDA 277). Note that this is the OEM control standard for modified particles, not a national standard.

The same logic applies to paint-free parts: particles are produced, scratches and whitening appear on the parts, and the first reaction is often 'the material is no good.' But the criteria for scratches themselves depend on where the part is used — interior parts can use amide-based lubricants, while using amides on exterior parts is definitely wrong, because amides decompose under UV, are thermally sensitive above 80°C, can migrate to form an oily film that attracts dust, can be washed away by rain and car washing, and are basically ineffective for talc-filled systems. Exterior parts should use an ultra-high molecular weight siloxane system.

The common practice in the industry for these two types of components is to first determine the 'component' and 'working conditions,' and then set the base material grade, filling ratio, and additive system—if the order is reversed, problems will keep drifting.

Ningbo Kolon New Materials Co., Ltd. commonly supplies modified polypropylene (PP) pellets in this area: based on the operating conditions of the parts, they provide the corresponding base material grades and modification directions, covering lines such as filled, glass fiber reinforced, toughened, flame retardant, low odor and low VOC, weather-resistant, and scratch-resistant without painting, mainly used to address issues like 'parts meet standards, but the pellets are difficult to select'.

Operating conditionKey criterionCologne regular supply
Automotive interior and exterior partsOdor ≤ Level 3 (VDA 270), Formaldehyde ≤ 10 mg/kg (VDA 275), TVOC ≤ 50 μgC/g (VDA 277)Low-odor, low-VOC modified PP, formulated per item
Paint-free exterior partsScratch dL < 1.5 (VW PV3952, 10N); Exterior parts must undergo UV agingSpray-free scratch-resistant modified PP, exterior uses siloxane system
Flame-retardant structural partsUL94 V-0; Glow-heat wire GWIT 750/775°Chalogen-free flame-retardant modified PP, glass fiber reinforced direction
low-temperature load-bearing parts−30°C notch impact; Low-temperature brittle cracking riskImpact copolymer PP EPDM/POE toughening
Pipe pressure-bearing partsLong-term hydrostatic pressure extension 50 years (GB/T 18252-2020)Copolymer PP pipe material direction

Just a reminder: when parts have problems, the most common mistake is to replace the material first. Low-temperature brittle cracking, warping, cracking, strong odors—each has more than one cause. Position first, then change the material; If the order is reversed, often after several changes, the material remains in place.

Eight, three final words

First, the application scope of modified PP is not a "do/can/can't be done" checklist; it's a sorting question. When judging a piece, first ask, "Which of these items is allowed to fall off?" If you can't answer, don't rush to finalize the material.

Second, choosing the wrong criteria is much more expensive than negotiating the wrong price. For automotive parts, first look at low temperatures and odor; for electrical parts, first look at flame retardant and CTI; for pipes, first look at long-term strength; for medical parts, first look at post-sterilization performance. Only when the indicators are right does the plan have meaning.

Third, the number of pieces does not equal the number of articles. Among 88 cases, the truly independent selection issues are 50-60. Merging different names for the same question into one article actually makes it easier to find and read through.

Next in this group, we'll start with the automotive section and break it down one by one. The first article is about bumpers—the one that looks the most familiar, but is actually the easiest to get wrong.

About Us

A PP granule is just a single particle when it leaves the factory.

It becomes the bumper, refrigerator liner, washing machine bucket, lunch box, with a whole set of solutions in between—which base material to choose, how much filler to add, toughening route, whether shrink pressure can be suppressed, and whether the smell is acceptable.

Ningbo Kelong New Materials Co., Ltd. produces self-produced modified polypropylene (PP) pelletizing, covering three grades of substrates: homopolymer, random copolymer, and impact-resistant copolymer, as well as modification directions such as filling, glass fiber reinforcement, toughening, flame retardancy, low odor and low VOC, weather resistance, and spray-free scratch resistance; Also engaged in PP resin, sub-brand materials, and bulk packaging materials for major petrochemical plants

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