230 改性尼龙与玻纤增强PP怎么选
从一场风叶的报价战讲起
去年，一家园林机械厂的注塑风叶被供应商拿着长玻纤 PP 的样品堵了门：同样的风叶，LGF-PP 报价比 PA66-GF30 低了三成，样件的刚度和耐温测试看着都还行。
厂里试了一小批装到低端机型上，跑了一个夏天——没问题。转到中端机型（发动机舱温度更高、振动更强），三个月后风叶根部出现疲劳裂纹，紧急召回换回 PA。
这一仗打完，厂里的结论写进了选材手册：LGF-PP 能抢走的，是 PA 盘子里"温度不高、载荷温和"的那一部分；载荷一重、温度一高，PA 的位置依旧焊死。 报价战年年有，边界划得清，输赢就都认账。这一篇把这对冤家的账本翻开看。
成本差距有多大
PP 树脂价格约为 PA66 的一半，GF30 增强 PP 也比 PA66-GF30 便宜 40-50%。另外 PP 密度只有 0.9-1.1（PA66-GF30 是 1.4），按体积算差距更大。
这就不难理解为什么很多企业想用增强 PP 替代 PA。但能不能替代，要看性能差在哪。
性能差距在哪
PP-GF30 与 PA66-GF30 的对比：拉伸强度——PP-GF30 约 90-110 MPa，PA66-GF30 约 180 MPa，差近一倍；
耐热——PP-GF30 的 HDT 约 150℃，PA66-GF30 约 250℃，差 100℃；抗蠕变——PP 本身蠕变大，增强后仍不如 PA；耐磨——PA 明显优于 PP。这四项是主要差距。
PP 的优势在哪
PP 不是全面落后，它有几项明显优势：一是不吸水（吸水率 < 0.02%），尺寸不受湿度影响；二是耐酸碱——PP 的耐化学性优于 PA，尤其耐酸耐碱；
三是密度低——轻量化效果好；四是成本。在温度不高、有化学腐蚀、受力不大的场合，PP-GF 反而更合适。
长玻纤 PP（LGF-PP）的突破
LGF-PP 是近年发展最快的品种之一——通过长玻纤增强，PP 的性能大幅提升。LGF-PP（玻纤长度 10-25 mm）拉伸强度可达 130-150 MPa，HDT 可达 155℃，冲击性能优于短玻纤 PP。这让 PP 在汽车前端模块、门模块、座椅骨架上大量替代 PA 和金属。这是以塑代钢的代表性材料**。
替代的判断标准
四条：一是长期温度——低于 100℃ 可以考虑 PP，高于 120℃ 不行；二是受力——静载荷且安全系数足够可以考虑，冲击载荷和疲劳载荷要谨慎；三是介质——有酸碱的场合 PP 反而更优；
四是尺寸——要求湿度下稳定的 PP 更优。四条过完，能不能替代基本清楚了。
PP 的固有难题
PP 有两个固有短板：一是表面能低、难粘接难涂装——PP 件要喷漆必须做火焰处理或底涂；二是耐候性差——PP 的分子链上有叔碳氢，极易被紫外攻击降解，户外件必须加足量耐候体系。这两点限制了 PP 的应用范围。
典型的替代案例
成功的替代：汽车门板骨架、前端模块支架、空调外壳、洗衣机部件、垃圾桶、物流托盘——这些场合温度不高、受力适中、批量大，用 PP-GF 或 LGF-PP 合理。失败的替代：发动机周边件、齿轮、高温件、耐磨件——这些用 PP 一定出问题。
工程实测：4 条强制测试
测试1：强度。PP-GF30 100 MPa，PA66-GF30 180 MPa——差近一倍。
测试2：耐热。PP-GF30 HDT 150℃，PA66-GF30 250℃——差 100℃。
测试3：LGF-PP。长玻纤 PP 拉伸 130-150 MPa，接近 PA66 未增强水平。
测试4：耐化学。PP 耐酸碱优于 PA——有腐蚀的场合 PP 更优。
边界声明
| 工况 | 推荐材料 |
|---|
| 100℃ 以下 + 受力适中 | PP-GF30 或 LGF-PP |
| 120℃ 以上 | PA66 |
| 有酸碱腐蚀 | PP |
| 齿轮耐磨件 | PA |
| 需要涂装 | PA（PP 难粘） |
工程备忘
增强 PP 替代 PA 的边界：温度 100℃ 以下、受力适中、无耐磨要求。LGF-PP 性能大幅提升但仍差 PA 一个档。
实战案例：常见踩坑与正解
踩坑一：尼龙与增强PP只比强度就下结论。选材对比要看短板——PA 的短板是吸水和耐酸，PBT 的短板是耐热和冲击，金属的短板是重量和成本。正解：列一张短板对照表，看哪家的短板在这个工况下不致命。
踩坑二：以塑代金属时直接按金属件的形状做塑料件。正解：塑料和金属的设计逻辑不同，塑料靠加强筋和壁厚分布，金属靠截面惯性矩，必须重新设计。踩坑三：换了材料不重算成本。
材料便宜了但壁厚要加厚，或者后处理工序增加，总成本可能反而更高。正解：算整件成本，不算单公斤价格。
延伸判断：验证顺序不要搞反
尼龙与增强PP的验证有固定顺序，跳过前面的直接做后面的，等于白做。
第一步验证材料本身：力学、热学、阻燃、电气这几项，确认料号没选错。
第二步验证工艺窗口：同一批料在不同模温、不同保压下打出来的件，性能差异可能超过 20%，工艺窗口要跑出来。
第三步才做整机或整件验证：装到实际工况里跑寿命。很多人的顺序是反的——直接装机跑寿命，不合格了不知道是料的问题还是工艺的问题，于是反复换料，半年出不了结果。
把这三件事写成一张表发给供应商，比打十通电话有用——尼龙与增强PP的选型沟通成本，基本都花在这几项反复确认上。
LGF-PP 的突破与天花板
长玻纤 PP 这几年的攻城略地，值得 PA 阵营认真对待——但它的天花板同样值得记住。
突破在于长玻纤的力学效率。普通短玻纤 PP 里，玻纤切得碎、增强效率打折；长玻纤工艺把玻纤做成几毫米的"骨架段"，成型的件里玻纤搭成三维网络，刚性和抗蠕变比短玻纤 PP 上了一个大台阶，静态性能已经摸到 PA-GF30 的门槛——这是它敢去敲 PA 大门的底气。
短板在三个地方：一是温度——PP 的基体决定了熔点只有一百六十多度，长期八十度以上就开始吃力，发动机舱、电机腔里的高温位置没资格进场；二是疲劳——风叶、齿轮这类千万次交变载荷，PP 的疲劳强度和 PA 差着一截，静态测试全过、动态工况翻车，园林机械那个案例就是教材；
三是耐候与染色——PP 不加耐候剂晒一季就粉化，配色稳定性也逊于 PA。
对采购而言，这张地图的正确用法是分层：低温、静态、轻载的结构件（家电内部支架、工具箱体、卫浴件），LGF-PP 的性价比几乎无解；高温、动态、重载的位置，PA 的基本盘纹丝不动。两条线的分界画清楚，报价战再打十年，也只是各自把边界磨得更准而已。
PA 与增强 PP 的高频问答
问：LGF-PP 替 PA 的判断线在哪？ 三条线画死：温度线——长期八十度以下 PP 有得谈，以上免谈；载荷线——静态支撑可以谈，千万次交变载荷（风叶、齿轮、连杆）不谈；
寿命线——消费品三五年可以谈，设备十年件不谈。三条线全在 PP 侧，大胆换；有一条跨界，回 PA。
问：两边的焊接工艺有差别吗？ 有，而且容易被忽略。PP 的热板焊、超声波焊都很顺，PA 吸湿后焊接参数要跟着含水率漂——焊接车间对 PA 件的来料湿度有发言权，这一点上 PP 反而省心。
问：PP 的耐候短板怎么补？ 加耐候剂——黑色件加了光稳体系能扛户外三五年，浅色件仍然衰减快。户外浅色件留在 PA 的阵营里，这条没有太多悬念。
问：收缩和翘曲差异大吗？ 大。PP 的成型收缩率是 PA 的一倍半上下，模具收缩率放错，全套尺寸全歪；LGF-PP 的长玻纤还带来取向翘曲。从 PA 转 LGF-PP，模具必须重做收缩率核算——想着改改参数就切换的，第一模就会上课。
复盘：一副家电支架的转换
也不是所有报价战都以 PA 获胜收场——反例同样有教材价值。
一家家电厂的内部支架，原来用 PA6-GF30，供应商换 LGF-PP 打样：工况是整机内部常温、静态承重三公斤、寿命期内不拆装——三条判断线全在 PP 侧。试产半年，支架零失效，单件成本降了四成，年用量八十万件的盘子，省下的钱给研发部门添了两台测试机。
有意思的是这家厂的做法：转换前把支架的工况逐条过了一遍判断线，转换后把 PA 和 PP 两个版本的失效数据并排跟踪两年。数据板挂在车间，后来又有一款件评估转换，流程照走一遍——该转的转得果断，不该转的理由写得清清楚楚。
报价战的正确打开方式，不是防守，是把判断线画好——线内的让市场去竞争，线外的守得住，这就是这两类材料相处的全部智慧。
问：LGF-PP 的牌号怎么快速评估？ 索要三组数据就能过第一轮：长玻纤含量与残留长度（决定力学上限）、热变形温度（过温度线）、疲劳曲线（过载荷线）——三样缺一样就换供应商，报价单上没有这三行的牌号不用谈。
问：PA 阵营怎么应对报价战？ 两个动作：低端位主动下探——增韧 PA、低成本配方把价格带拉下来，别把入门市场拱手让人；高端位讲差异化——耐疲劳、耐高温的实测数据定期更新成选材手册发给客户。守阵地靠的不是价格战，是让客户看懂多花的钱买了什么。
判断线落地的三步
把三条判断线从口号变成流程，三步就够。
第一步，工况入表。每个件的温度、载荷谱、目标寿命三栏写实——拿不到工况数据的件，评估根本不开始。
第二步，逐条打分。三条线各判一边，全绿转 PP、全红留 PA、混色件单独立项做疲劳实测——不允许凭感觉跳过。
第三步，双版本跟踪。转出去的件，新旧两版失效数据并排跟踪两年，数据板挂在车间——转对了的攒信心，转错了的早发现。
这套流程的价值在第二年之后：判断线越用越准，边界越磨越细，报价战再来的时候，哪款该守哪款该放，会议十分钟就有结论。材料的攻防打到最后，是流程的攻防。
问：LGF-PP 的粒子里玻纤看得到吗？ 看得到——切断的玻纤束在粒子上像埋进去的白色细线，长度几毫米。上机前抽一把粒子看玻纤长度和分布，线头整齐、长短一致的是好料；粉末状的碎纤多，力学数据就要打问号。这个土办法三秒钟，比很多报告都灵。
问：PA 和 PP 混线生产要注意什么？ 料筒清洗是红线——PP 残料混进 PA，交联出黑丝和气孔；反过来 PA 混进 PP 是脆点来源。换料洗筒要用过渡料走三遍，洗完打空模确认——混线车间的批量事故，一半出在洗筒偷工上。
问：PP 做外观件怎么样？ 反而常被低估——PP 喷涂附着好、色域宽、成本低，家电的白色外壳、洗衣机面板大量是 PP 的天下。短板还是那一条：浅色件户外耐候弱，室内外观件放心用，阳台和户外的浅色件慎选。
问：两边的回收体系差多少？ PP 的回收体系是全球最成熟的那一档——瓶盖、周转箱、家电外壳的回收链完整，rPP 供应稳定；PA 的回料能用，但牌号管理严格，批号一乱性能就乱。
客户提出回收含量要求的订单，PP 在达标成本上天生占优——绿色订单选料时，这一条要提前摆上桌。回收含量每提一成，配方和验证的动作就多一轮，报价里要预留这部分功夫。
结语
样品寄出去之后——选料这件事，越早问越省事。
这类件的选料与试模，可以一起聊。
230 Modified Nylon vs Glass Fiber Reinforced PP: How to Choose
Starting from a bidding war for wind turbines
Last year, an injection-molded fan blade from a landscaping machinery factory was blocked at the door by a supplier with a sample of long glass fiber PP: for the same fan blade, the LGF-PP quoted price was 30% lower than PA66-GF30, and the stiffness and temperature resistance tests of the sample looked okay.
The factory tested a small batch by installing it on low-end models and ran it for a whole summer—no problem. When applied to mid-range models (with higher engine compartment temperatures and stronger vibrations), fatigue cracks appeared at the base of the fan blades after three months, leading to an urgent recall to replace them with PA.
After this battle, the factory's conclusion was written into the material selection manual: what LGF-PP can take away is the part of the PA plate where the 'temperature is not high and the load is moderate'; when the load is heavy and the temperature is high, PA's position remains firmly fixed. Price wars happen every year, but with clear boundaries, both sides accept the wins and losses. This article opens the account book of this feud to take a look.
How big is the cost gap?
The price of PP resin is about half of PA66, and GF30 reinforced PP is also 40-50% cheaper than PA66-GF30. In addition, the density of PP is only 0.9-1.1 (PA66-GF30 is 1.4), so the difference is even greater when calculated by volume.
This makes it easy to understand why many companies want to use reinforced PP to replace PA. But whether it can replace it depends on where the performance differences lie.
Where is the performance gap?
Comparison between PP-GF30 and PA66-GF30: Tensile strength—PP-GF30 is about 90-110 MPa, PA66-GF30 is about 180 MPa, nearly double the difference;
Heat resistance — The HDT of PP-GF30 is about 150°C, while that of PA66-GF30 is about 250°C, a difference of 100°C; Creep resistance — PP itself has high creep, and even after reinforcement, it is still not as good as PA; Wear resistance — PA is significantly better than PP. These four aspects are the main differences.
What are the advantages of PP?
PP is not completely inferior; it has several obvious advantages: first, it does not absorb water (water absorption < 0.02%), so its size is not affected by humidity; second, it is resistant to acids and alkalis—PP's chemical resistance is better than PA, especially against acids and alkalis.
Third, it has low density — good lightweight effect; fourth, cost. In situations where the temperature is not high, there is chemical corrosion, and the stress is not large, PP-GF is actually more suitable.
Breakthrough of Long Glass Fiber PP (LGF-PP)
LGF-PP is one of the fastest-growing types in recent years—its performance has been greatly enhanced through long glass fiber reinforcement. LGF-PP (glass fiber length 10-25 mm) can reach a tensile strength of 130-150 MPa, an HDT of up to 155°C, and its impact performance is superior to short glass fiber PP. This allows PP to largely replace PA and metal in automotive front-end modules, door modules, and seat frames. It is a representative material of replacing steel with plastic.
Alternative criteria
Article 4: First is long-term temperature — if below 100°C, PP can be considered; if above 120°C, it is not suitable. Second is load — if it is a static load and the safety factor is sufficient, it can be considered, but caution should be exercised with impact loads and fatigue loads. Third is the medium — in cases with acids and bases, PP is actually better.
Fourth is size — PP that is stable under humidity is better. After going through the four points, it's basically clear whether it can be replaced.
The inherent problem of PP
PP has two inherent shortcomings: first, it has low surface energy, making it difficult to bond or paint—PP parts must undergo flame treatment or priming before painting; second, it has poor weather resistance—PP's molecular chain contains tertiary hydrocarbons, which are easily degraded by ultraviolet attack, so outdoor parts must be equipped with a sufficient weather-resistant system. These two points limit the application scope of PP.
Typical alternative case
Successful substitutions: car door panel frames, front-end module brackets, air conditioning housings, washing machine parts, trash cans, logistics pallets—these are applications with moderate temperatures, moderate stress, and large volumes, where using PP-GF or LGF-PP is reasonable. Failed substitutions: engine peripheral parts, gears, high-temperature components, wear-resistant parts—using PP in these will definitely cause problems.
Engineering Test: 4 Mandatory Tests
Test 1: Strength. PP-GF30 100 MPa, PA66-GF30 180 MPa — nearly double the difference.
Test 2: Heat resistance. PP-GF30 HDT 150°C, PA66-GF30 250°C — difference of 100°C.
Test 3: LGF-PP. Long glass fiber PP tensile strength 130-150 MPa, close to the unreinforced PA66 level.
Test 4: Chemical Resistance. PP is more resistant to acids and bases than PA—PP is better in environments with corrosion.
Boundary Declaration
| Operating condition | Recommended materials |
|---|
| Below 100℃, moderate force | PP-GF30 or LGF-PP |
| Above 120℃ | PA66 |
| Has acid and alkali corrosion | PP |
| Gear wear-resistant parts | PA |
| Needs painting | PA (PP difficult to bond) |
Engineering Memo
Enhancing the boundary where PP can replace PA: below 100°C, moderate stress, no wear resistance required. LGF-PP performance is significantly improved but still one level below PA.
Practical Case Study: Common Pitfalls and Correct Solutions
Pitfall 1: Concluding based on strength alone when comparing nylon and reinforced PP. Material selection comparison should focus on weaknesses—PA's weaknesses are water absorption and acid resistance, PBT's weaknesses are heat resistance and impact resistance, and metals' weaknesses are weight and cost. Correct approach: Make a table of weaknesses to see which one's weaknesses are not fatal under this working condition.
Pitfall 2: When replacing metal with plastic, directly making the plastic part in the shape of the metal part. Correct approach: The design logic for plastic and metal is different; plastic relies on ribs and wall thickness distribution, while metal relies on section moment of inertia, so a redesign is necessary. Pitfall 3: Changing materials without recalculating costs.
The material is cheaper, but the wall thickness needs to be increased, or additional post-processing steps are added, which may actually result in higher total costs. The correct approach: calculate the cost for the entire piece, not the price per kilogram.
Extended judgment: Do not reverse the verification order
There is a fixed order for the verification of nylon and reinforced PP; skipping the earlier steps and going straight to the later ones is equivalent to doing nothing.
Step one is to verify the material itself: mechanical, thermal, flame retardant, and electrical properties, to confirm that the part number was not selected incorrectly.
Step 2: Verify the process window: For the same batch of material, parts produced under different mold temperatures and different holding pressures may show performance differences of over 20%, so the process window needs to be determined.
The third step is to perform validation on the whole machine or complete part: install it in actual working conditions to test the lifespan. Many people do it in the opposite order—they directly install the machine to test the lifespan, and if it fails, they don't know whether it's a material problem or a process problem, so they keep changing materials repeatedly and can't get results for half a year.
Write these three things into a table and send it to the supplier; it’s more useful than making ten phone calls — the communication cost for selecting between nylon and reinforced PP is basically spent on repeatedly confirming these few items.
Breakthroughs and Ceiling of LGF-PP
The rapid expansion of long glass fiber PP in recent years deserves serious attention from the PA camp—but its ceiling is equally worth remembering.
The breakthrough lies in the mechanical efficiency of long glass fiber. In ordinary short glass fiber PP, glass fiber is cut into pieces and enhances efficiency; Long glass fiber processes make glass fiber into "skeleton segments" of several millimeters, forming a three-dimensional network inside the formed parts. Its rigidity and creep resistance are a big step above short glass fiber PP, and its static performance has already reached the threshold of PA-GF30—this is the confidence it dares to knock on the PA door.
The shortcoming lies in three areas: first, temperature—the PP substrate has a melting point of only about 160 degrees, and it struggles at temperatures above 80 degrees over time. High-temperature areas in engine compartments and motor chambers are not qualified to enter the field; Second is fatigue—blades, gears, and other tens of millions of cycles of loads have fatigue strength far behind PA; static tests pass all, but dynamic conditions fail; the garden machinery case is textbook;
Third is weather resistance and dyeing — PP will powder after just one season without weathering agents, and its color stability is inferior to PA.
For procurement, the correct use of this map is layering: low-temperature, static, light-load structural parts (internal brackets of appliances, toolboxes, bathroom parts), LGF-PP's cost-performance ratio is almost unsolvable; High-temperature, dynamic, heavy-load positions—the basic PA disc remains completely unchanged. The boundary between the two lines is clearly drawn; even if the price war continues for another decade, it will only sharpen the boundaries more accurately.
PA High-frequency Q&A with reinforced PP
Q: Where is the judgment line for LGF-PP replacing PA? Three lines are drawn: temperature line — long-term below 80 degrees Celsius PP is negotiable, above is avoided; Load line — static support can be discussed, but tens of millions of alternating loads (blades, gears, connecting rods) are not discussed;
Life line — consumer products can be discussed for three to five years, equipment over ten years is not a matter. All three lines are on the PP side, boldly replaced; One cross-border line returns to PA.
Q: Are there differences in welding processes on both sides? Yes, and they are easily overlooked. PP's hot plate welding and ultrasonic welding are smooth, but after PA absorbs moisture, welding parameters must follow moisture content—the welding workshop has authority over the incoming material humidity of PA parts, so PP actually saves you the trouble.
Question: How do you fix PP's weathering shortcomings? Add weathering agents—black parts with a light-stabilization system can withstand outdoor wear for three to five years, while light-colored parts still degrade quickly. Outdoor light-colored parts remain in the PA camp, so there's not much doubt about this.
Q: Is there a big difference between shrinkage and warpage? Big. PP's shrinkage rate is about one and a half times that of PA, but if the mold shrinkage is misaligned, the entire set is misaligned; LGF-PP's long fiberglass also causes orientation warpage. Switching from PA to LGF-PP, molds had to redo shrinkage calculations—those who switched just by changing parameters would start a lesson on the first mold.
review: Switching a home appliance bracket
Not every quotation war ends with PA—counterexamples are also valuable as textbooks.
An appliance factory's internal bracket originally used PA6-GF30, supplier switched to LGF-PP for proofing: operating conditions were internal room temperature, static load of 3 kg, no disassembly during lifespan—all three judgment lines were on the PP side. After half a year of trial production, the bracket failed, unit cost dropped by 40%, and with an annual usage of 800,000 plates, the money saved was spent on two testing machines for the R&D department.
What's interesting is this factory's approach: before conversion, they pass the bracket condition line by line one by one, then track the failure data of both PA and PP versions side by side for two years. The data board is hung in the workshop, and later another piece is evaluated and converted, with the process repeated—the necessary changes are decisive, and the reasons for not are clearly written.
The correct way to start a quotation war isn't to defend, but to draw the judgment line well—let the market compete within the line, hold the line outside the line. That's the whole wisdom of these two types of materials.
Question: How do you quickly evaluate LGF-PP grades? Requesting three sets of data sets can pass the first round: long glass fiber content and residual length (determining mechanical upper limit), thermal distortion temperature (over-temperature line), fatigue curve (overload line)—if any one is missing, switch suppliers; if the quotation sheet doesn't have these three lines, don't discuss it.
Question: How does the PA camp respond to the quotation war? Two actions: proactively lowering the low-end segment—toughening PA, low-cost formulas to lower the price range, don't hand over the entry-level market; Differentiation at the high-end segment—regularly update fatigue and high-temperature resistance test data into material manuals for customers. Holding the ground isn't about price wars, but about helping customers understand what they're paying for more.
Three steps to implementing judgment lines
Turn the three judgment lines from slogans into processes, three steps are enough.
Step one: enter the operating condition table. Record each part's temperature, load spectrum, and target lifespan columns realistically—if you can't get working condition data, don't start the evaluation at all.
Step two: score each item. Each of the three lines is judged on one side: all green to PP, all red to PA, mixed color parts to individual fatigue tests—no skipping based on feel.
Step three: dual version tracking. For transferred parts, the old and new versions of failure data are tracked side by side for two years, and the data board is hung in the workshop—those who do it correctly build confidence, those who make mistakes are spotted early.
The value of this process lies in the second year: the more you use the judgment lines, the more accurate they become; the edges become finer and finer. When the quotation war returns, which should be guarded and which should be used, the meeting can reach conclusions in ten minutes. The final battle of material offense and defense is the process of offense and defense.
Q: Can you see the fiberglass inside the particles of LGF-PP? Yes—the cut fiberglass bundles look like white thin threads embedded in the particles, a few millimeters long. Before installing the machine, draw a handful of particles to observe the length and distribution of the fiberglass; if the thread ends are neat and of consistent length, it is good material; If there are more powdered broken fibers, mechanical data should be questioned. This simple method takes three seconds, which is more effective than many reports.
Question: What should be noted in mixed production lines of PA and PP? Barrel cleaning is a red line—leftover PP material mixed into PA, cross-linking black threads and pores; Conversely, PA mixed into PP is the source of brittleness. Changing drums requires three passes of transition material, and after washing, empty mold confirmation—half of batch accidents in mixing workshops are due to shallow washing processes.
Q: How is PP for exterior parts? It's often underestimated — PP sprays well adheres, has a wide color gamut, and low cost. The white casing and washing machine panels of home appliances are largely dominated by PP. The shortcoming remains: light-colored parts have poor outdoor weather resistance, indoor exterior parts are safe to use, and light-colored parts for balconies and outdoors should be chosen carefully.
Q: How much difference is there between the two recycling systems? PP's recycling system is among the most mature globally—the recycling chain for bottle caps, turnover boxes, and appliance shells is complete, and rPP supply is stable; PA recycled material is usable, but grade management is strict, and if the batch number gets messy, performance becomes chaotic.
For orders with recycled content requirements, PP naturally has an advantage in meeting standards—when selecting materials for green orders, this must be put on the table in advance. For every 10% increase in recycled content, the formula and verification steps are added, so this time should be reserved in the quotation.
Conclusion
After sending out samples—the earlier you ask about material selection, the easier it is.
For these types of items, material selection and mold testing can be discussed together
