SMT 连接器是塑料件里被"烤"得最狠的一类。
它要过一次回流焊：无铅工艺的峰值温度通常在 240-260℃，220℃ 以上的时间有 60-90 秒，整个周期四到六分钟。
更要紧的是，这往往不是一次性考验——双面贴装的板子要过两次炉，返修还要再加一次。
所以 SMT 连接器选料的第一个问题不是"耐多少度"，而是"过几次炉、峰值多少"。
SMT 车间的回流焊炉，是连接器塑料件的生死考场。
炉温曲线峰值两百六十度上下，普通 PA66 在这个温度里早就软化变形。
一家连接器厂的第一炉试产，料条出来歪歪扭扭，间距全漂。
工程部把炉温降了又降，焊接质量先不行了。
路只有一条：换耐回流焊的料，而不是迁就炉子。
电子行业的塑料件，从来都是材料迁就工艺，没有反过来的时候。
一、回流焊考的是短时峰值，不是长期耐温
这两个指标经常被混着用，但它们其实是两件事。
长期耐温看的是热老化后的性能保留率，典型判据是 150℃ × 1000 小时，拉伸强度保留率在 75% 以上算扎实；回流焊考的是在接近熔点的温度下短时间能不能挺住。
一个材料长期耐温很好，不代表它能过 260℃ 的炉；反过来，能过炉的材料，长期 150℃ 也可能撑不住。
判断口诀是：短时看熔点与热变形温度，长期看老化保留率，两张表要分开要。
还有一件事容易被忽略：过炉次数。过一次和过两次，对材料的余量要求完全不同，很多"一次没事、二次变形"的案例就是这么来的。
二、先分清三类"不行"，是三条不同的线
同一句"过炉后不行了"，其实至少对应三种完全不同的机制。
第一类是熔化与软化：起泡、溢胶、引脚歪斜、本体塌陷。这是耐温余量不够，属于选料问题。
第二类是翘曲与变形：本体自己扭了、平面度超差、焊点受力开裂。这通常不是耐温的问题，而是玻纤取向与内应力的问题。
第三类是气爆与银纹：表面发白、内部微裂、超声扫描有分层。这是吸湿没烘干，属于工艺问题。
三种现象看着都像"材料不行"，但前一种要换料，后两种换料往往解决不了。
所以排查的第一步永远是先看清：是熔化、是翘曲，还是气爆。
补一个判断技巧：熔化往往伴随整体形变，翘曲通常是本体扭曲但表面完好，气爆则常在表面看到发白或银纹。 三者的外观特征其实很有区分度，现场拍照留证就能大致定位，不用一上来就做切片分析。
三、材料档位怎么分
按回流焊的要求，常见材料大致分四档：
| 档位 | 代表材料 | 耐回流焊的一般判断 |
|---|
| 一档 | PA66-GF | 余量小，多用于过炉后的二次装配件 |
| 二档 | PA46-GF | 结晶快、耐温较高，中低峰值工艺常用 |
| 三档 | PA6T / PA9T | 熔点 310℃ 以上，主流 SMT 连接器方向 |
| 四档 | LCP / PPS | 更耐温，工艺与成本另有取舍 |
判断余量的经验做法：材料的热变形温度或熔点，相对炉内峰值留出 20-30℃ 以上的空间，才算踏实。
注意这里说的是炉内实测峰值，不是设备设定值。同一台炉，板子上不同位置的实测温度能差十几度，测炉温曲线不是走流程，是这项判断的输入条件。
四、翘曲的真正来源是取向，不是耐温
玻纤增强料有一个绕不开的特性：流动方向和垂直方向的收缩率不一样。
这个差异在平板件上不明显，但在连接器这种又长又有料流转折的结构上，会被放大成明显的翘曲。
三个可控变量：
一是浇口位置。 浇口定的是料流方向，也就定了玻纤的排布方向，也就定了收缩差的方向。翘曲先改浇口，不要先改配方。
二是玻纤含量。 含量越高，各向异性越强，翘曲倾向往往越大。有些件把 50% 降到 30%，翘曲反而好了，刚性还够用。
三是结构对称性。 壁厚不对称、加强筋只在单侧、嵌件偏心，都会把收缩差放大成变形。
五、干燥这件事，在 SMT 件上会被放大
尼龙吸湿是本性。含水率超标的料在高温下，水分瞬间汽化，就会出现银纹、气孔、内部微裂。
普通注塑件上这些问题有时看不出来，但在过炉件上会被放大——因为过炉本身就是一次高温，等于把没排掉的水再蒸一遍。
比较踏实的做法是：干燥温度按材料体系定，PA6T 与 PA9T 通常在 100-120℃；干燥时间按初始含水率定；上机前用水分仪或露点数据确认，不要凭手感。
对高要求的件，干燥后还要防二次吸湿——料斗保温、周转封闭，这些细节在长周期的产线上很关键。
还有一条经验：干燥条件要和存放条件一起看。梅雨季里拆包后的料在车间放几个小时，含水率就能明显回升；干燥做得再好，周转环节敞口放置也是白做。
对连接器这类小件，料斗容量小、周转快，含水率反而更好控制；反倒是一次生产周期长、料斗里停留时间久的情况，要特别留意。
六、验证不要只看物性表
物性表能给的是材料在标准试样上的表现，给不了"你这个件过两次炉会怎样"。
靠谱的验证顺序：
第一步，按实际炉温曲线过炉，带上治具，不要用简化曲线代替。
第二步，过炉后测外形：尺寸、平面度、共面度，用三坐标或影像仪，别靠目视。
第三步，做二次过炉，模拟双面贴装。
第四步，把老化后的样件一起过炉。 这一条最容易被跳过，但真实工况就是"用了几年之后再返修一次"，材料老化后耐焊接热的能力是下降的。
第五步，看焊点。 塑料变形最后往往体现在焊点受力开裂上，本体看着没事，焊点已经伤了。
七、选型顺序：把顺序定下来就不会乱
把上面的判断串成一条线：
① 定峰值温度与过炉次数 → ② 定结构对称性与平面度要求 → ③ 定材料耐温档位 → ④ 定玻纤含量与浇口方案 → ⑤ 定干燥与成型窗口 → ⑥ 过炉实测验证。
顺序不能颠倒。 先选料再谈结构，往往要在后面为翘曲做大量补救；先把峰值和结构定清楚，选料这一步会变得很短。
耐回流焊的料怎么选，先把温度账算清。
无铅工艺的峰值两百六十度附近，物料要在这个温度下撑过几十秒。
普通 PA66 的熔点就在两百六十度附近，直接软化，玻纤也救不了。
所以 SMT 连接器主流走高温尼龙路线，PA9T、PPA 这类熔点更高的体系。
选型时别只看熔点，要看高温下的模量保持和尺寸漂移。
回流焊前后的共面度变化，才是装配真正关心的数字。
有些厂用高温下十分钟的热变形测试来初筛，比翻资料可靠。
把共面度漂移压在装配公差以内，这颗连接器才算过了回流焊关。
追问一：连接器料要不要无卤？
看终端要求。出口欧美和头部品牌的订单，无卤基本是标配。无卤体系的 CTI 表现更好，但流动性差一档，薄壁填充要重新验证。有工厂在无卤切换时栽在填充上，浇口改了三轮才稳。切换无卤是趋势，但要连模具一起规划。
追问二：回流焊次数怎么算余量？
按实际产线最多过两次炉设计，验证做三次，留一次余量。有些返工板要过三炉，物料就得按三次峰值存活。验证时做逐次的尺寸和共面度记录，衰减曲线一目了然。
一单翘曲的追查
连接器过炉后翘曲，扣板扣不上。查了很久发现是包装盒在炉边预热了料件，过炉前的预变形叠加了焊接变形。整改是来料件远离热源存放，过炉前恒温放置。失效链条上最不起眼的一环，往往是压垮公差的最后一根稻草。
回流焊件验收三查
峰值存活记录、逐炉共面度曲线、无卤或阻燃文件。三查齐了，SMT 关口才算把住。
这一篇的知识地图可以收成一句话：炉温是考卷，材料是考生，共面度是成绩单。考生实力看高温数据，成绩好坏看装配公差，考卷每年在加难，材料的账要年年重算。
SMT 连接器还有个兄弟话题：板对板连接器的共面度竞赛。端子间距往零点四以下走，共面度公差跟着砍半。材料的高温尺寸稳定性从加分项变成及格线。几家头部连接器厂的选型清单里，回流焊前后的尺寸漂移数据都是明文要求。这个趋势对材料端的信号很明确：高温数据要做全温域曲线，不能只给单点。新项目报价时把全温域数据包准备好，评审效率高出一截。
生产端还有一个协同点：湿气敏感等级管理。连接器吸湿后过炉会起泡，业内叫爆米花效应。物料按湿敏等级管理，拆包后计时回烘。有工厂把它做成看板系统，每包料有电子时钟，超时自动锁定。湿敏管理和耐回流焊选型是一体两面，料端把吸湿率做低，产线端的时钟压力就小。两头协同，直通率才有空间。采购在选料时多问一句吸湿率，产线的管理成本立刻不同。
清单收官
回流焊件的定点资料包建议五件套：全温域尺寸曲线、逐炉共面度数据、湿敏等级证明、无卤或阻燃文件、端子共面校核报告。五件套齐备的供应商，在连接器行业就是靠谱的代名词。电子行业的定点越来越像考试，五件套就是准考证。
连接器行业还有个颜色编码的细节。不同电路用的连接器外壳颜色不同，防止插错位。色母对耐回流焊性能有影响，深色吸热更多，峰值时的温度更高。有工厂的黑色件过炉正常，浅色件反而出问题，追查发现是浅色配方耐温等级低了半档。换色不换验证，是连接器行业的隐形雷区。颜色变更也该进变更管理清单，这条经验值得写进每个连接器厂的质量手册。
装配端的验证也别漏。连接器往 PCB 上插，插拔力由倒钩和孔位公差决定。过炉后塑料的尺寸变化会改变插拔力，力太小接触不良，力太大装板困难。验证时把过炉前后的插拔力都测，数据一起交给客户。电子件的竞争力，就藏在这些两页纸就能写完的数据包里。数据包越厚，客户设计时越省心，订单的粘性自然越大。
给正在选料的工程师一个排序建议：先按峰值存活和共面度筛掉一批，再按 CTI 和阻燃筛第二轮，最后比吸湿率和价格。四层漏斗走完，剩下的两三个牌号做试产对比。选型的效率不在查得多快，在淘汰得多果断。每层漏斗的淘汰标准提前写好，评审会上就没有回头路可讨。
回流焊连接器的成本账也有个新算法。高温料比通用料贵一半，但省掉了通孔插装的工序和人工。SMT 直通率的提升折成钱，一年下来远超料价差。有工厂把这笔账做成单页给客户，定点通过率明显提升。塑料件的价值论证，就是要把工艺端的收益也算进来。只盯着料价比价的时代，正在被综合成本核算淘汰。
再补一个库存视角：高温尼龙的保质期管理比通用料严格，吸湿快，开封后要用完。仓库按先进先出加开封计时双轨管理，浪费立刻下降。物料的时效管理和选料同样重要，好料管不好，性能照样打折。电子厂的物料管理员，值得把高温料的脾气当必修课学。
选型收尾时提醒一句：连接器的技术迭代快，材料的复验周期要短。两年一轮的全项复验，比出事后的排查便宜太多。电子件没有一劳永逸的选型，只有紧跟迭代的动态选型。把复验写进年度质量计划，是连接器供应商的基本修养。
结语
SMT 连接器用尼龙，判断链其实只有三条：
耐温看峰值与次数，翘曲看取向与结构，气爆看干燥与含水率。
三条线分开走，问题就好定位；混在一起谈，就只能靠反复试。
如果你手上有个连接器正在过炉问题上纠结，把三样东西发过来：炉温曲线、件的结构与浇口方案、过炉后的表现。
三行说清我们是谁：
改性能——改性尼龙（PA6 / PA66 / PA46 / PA11 / PA12 / PA6T / PA9T 及尼龙合金）、改性 PPO / PPS / 热塑性弹性体；
有货源——各大化工巨头尼龙树脂、副牌料、大包料现货；
给判断——什么件，用什么料。
SMT connectors are the type of plastic parts that get 'baked' the most severely.
It needs to go through reflow soldering once: the peak temperature for lead-free processes is usually 240-260℃, with a time above 220℃ of 60-90 seconds, and the entire cycle lasts four to six minutes.
More importantly, this is often not a one-time test—the double-sided mounted boards have to go through the furnace twice, and repairs add another time.
So the first question when selecting materials for SMT connectors is not 'how much heat it can withstand', but 'how many reflow cycles and what peak temperature'.
The reflow soldering furnace in the SMT workshop is the life-and-death testing ground for connector plastic parts.
The peak of the furnace temperature curve is around 260 degrees, at which temperature ordinary PA66 has long since softened and deformed.
The first trial production of a connector factory came out twisted, with the spacing all off.
The engineering department kept lowering the furnace temperature, and the welding quality first became unacceptable.
There is only one way: switch to solder paste suitable for reflow soldering, rather than accommodating the oven.
Plastic parts in the electronics industry have always been about the material accommodating the process, never the other way around.
1. Reflow soldering tests for short-term peak temperature, not long-term heat resistance.
These two indicators are often used interchangeably, but they are actually two different things.
Long-term temperature resistance examines the retention rate of performance after thermal aging. A typical criterion is 150°C × 1000 hours, and a tensile strength retention rate of over 75% is considered solid; reflow soldering tests whether it can withstand short periods at temperatures close to the melting point.
A material that has good long-term heat resistance does not mean it can withstand a 260°C oven; conversely, a material that can pass through the oven may not hold up over the long term at 150°C.
The judging mnemonic is: for short-term, look at the melting point and heat distortion temperature; for long-term, look at the aging retention rate. The two tables should be kept separate.
There is one more thing that is easily overlooked: the number of times it goes through the furnace. Going through once and going through twice require completely different material allowances, and many cases of 'fine the first time, deformed the second time' arise in this way.
2. First, distinguish between the three types of 'not okay'; these are three different lines.
The same phrase 'it doesn't work after being through the furnace' actually corresponds to at least three completely different mechanisms.
The first category is melting and softening: bubbling, glue overflow, bent pins, and body collapse. This is due to insufficient temperature margin and is a material selection issue.
The second category is warping and deformation: the body itself twists, flatness is extremely poor, and welds crack under stress. This is usually not a temperature resistance issue, but a problem with fiberglass orientation and internal stress.
The third category is gas explosions and silver streaks: the surface turns white, there are micro-cracks inside, and ultrasonic scans show delamination. This is due to moisture absorption without drying, which is a process issue.
The three phenomena all look like 'the material is no good,' but the first one requires changing the material, while changing the material often doesn't solve the other two.
So the first step in troubleshooting is always to clearly see: is it melting, warping, or a gas explosion.
Add a tip for identification: melting is often accompanied by overall deformation, warping usually involves twisting of the body but with the surface intact, and popcorning often shows whitening or silver streaks on the surface. The visual characteristics of the three are actually quite distinguishable; taking photos on-site for evidence can roughly locate the issue, without immediately resorting to slicing analysis.
3. How are the material grades divided?
According to the requirements of reflow soldering, common materials are roughly divided into four categories:
| Gear | Representative materials | General Determination of Reflow Soldering Resistance |
|---|
| a gear | PA66-GF | The remaining quantity is small, mostly used for secondary assembly parts after passing the furnace. |
| Second gear | PA46-GF | Crystallizes quickly, has relatively high temperature resistance, commonly used in medium and low peak value processes |
| Third gear | PA6T / PA9T | Melting point above 310℃, mainstream SMT connector direction |
| four gears | LCP / PPS | More temperature-resistant, with different trade-offs in process and cost |
Empirical practice for determining the margin: The heat deformation temperature or melting point of the material should leave a space of 20-30℃ above the relative peak inside the furnace to be considered reliable.
Note that this refers to the measured peak value inside the furnace, not the equipment's set value. On the same furnace, the actual temperatures at different positions on the board can differ by more than ten degrees. Measuring the furnace temperature curve is not about following a process; it is an input condition for this judgment.
4. The true source of warping is orientation, not temperature resistance.
Glass fiber reinforced material has an unavoidable characteristic: the shrinkage rate is different in the flow direction and the perpendicular direction.
This difference is not obvious on flat parts, but in structures like connectors, which are long and have changes in material flow direction, it can be amplified into noticeable warping.
Three controllable variables:
First is the gate location. The gate determines the direction of the material flow, which in turn determines the orientation of the glass fibers, and consequently the direction of shrinkage differences. For warping, start by changing the gate, not the formulation.
Second is the glass fiber content. The higher the content, the stronger the anisotropy, and the greater the tendency to warp. For some parts, reducing it from 50% to 30% actually improves warping, while the rigidity is still sufficient.
Third is structural symmetry. Asymmetric wall thickness, ribs only on one side, and eccentric inserts can all amplify shrinkage differences into deformation.
5. The matter of drying will be amplified on SMT components
Nylon is naturally hygroscopic. If the moisture content of the material exceeds the limit, the water will instantly vaporize at high temperatures, causing silver streaks, pores, and internal micro-cracks.
These issues on ordinary injection molded parts are sometimes not visible, but they get amplified on parts that go through the oven — because the oven itself is a high-temperature process, essentially steaming any water that hasn't been expelled once more.
A more practical approach is: set the drying temperature according to the material system, with PA6T and PA9T usually at 100-120°C; set the drying time according to the initial moisture content; before going on the machine, use a moisture meter or dew point data to confirm, and do not rely on touch.
For parts with high requirements, after drying, they must also be protected against secondary moisture absorption—hopper insulation and closed handling. These details are very important on long-cycle production lines.
There is one more piece of experience: drying conditions should be considered together with storage conditions. During the plum rain season, the material that has been unpacked can see a significant increase in moisture content after sitting in the workshop for a few hours; no matter how well the drying is done, leaving it exposed during handling is pointless.
For small parts like connectors, the hopper has a small capacity and a fast turnover, making it easier to control the moisture content; on the contrary, for situations with a long production cycle and a long residence time in the hopper, special attention is required.
6. Verification should not rely solely on the physical property table
The material properties table can show the performance of the material on standard samples, but it can't tell you 'what will happen to your part after going through the furnace twice'.
Reliable verification sequence:
Step one, pass through the oven according to the actual oven temperature curve, with the fixture on, and do not use a simplified curve as a substitute.
Step two, measure the appearance after passing through the furnace: dimensions, flatness, and coplanarity, using a coordinate measuring machine or an optical measurement device, not by visual inspection.
Step three, perform a second pass through the furnace, simulating double-sided mounting.
Step four, pass the aged samples through the furnace together. This step is the easiest to skip, but the real situation is exactly 'after using for a few years, repair it again.' After the material has aged, its ability to withstand welding heat decreases.
Step five, inspect the solder joints. Plastic deformation often ultimately shows up as cracks in the solder joints under stress. The main body may look fine, but the solder joints are already damaged.
7. Selection sequence: Once the order is set, it won't be confusing .
Connect the above judgments into a line:
(1) Set peak temperature and number of passes → (2) Set structural symmetry and flatness requirements → (3) Set material temperature resistance level → (4) Set glass fiber content and gate scheme → (5) Set drying and forming window → (6) Verify by testing after passing through the oven.
The order must not be reversed. Selecting materials before discussing structure often requires extensive remedies for warping later; Clarify the peak value and structure first; the material selection step will become very short.
How to choose materials resistant to reflow soldering? First, calculate the temperature chart.
The peak of lead-free processes is around 260 degrees, and materials need to survive at this temperature for tens of seconds.
Ordinary PA66 has a melting point around 260 degrees, so it softens directly, and fiberglass can't save it.
So the mainstream SMT connectors follow the high-temperature nylon route, while PA9T, PPA, and other higher-melting-point systems are used.
When selecting models, don't just look at the melting point; look at modulus retention and dimensional drift at high temperatures.
The change in coplanarity before and after reflow soldering is the number that truly matters in assembly.
Some factories use a ten-minute thermal deformation test at high temperature for initial screening, which is more reliable than flipping through the data.
Keep the coplanar drift within the assembly tolerance before the connector passes the reflow soldering test.
Follow-up question 1: Should the connector material be halogen-free?
Depends on the terminal requirements. For orders exported to Europe, America, and leading brands, halogen-free is basically standard. The CTI performance of halogen-free systems is better, but its fluidity is a notch lower, so thin-wall filling needs to be re-validated. Some factories get stuck on filler during halogen-free switching, and the gate has to be modified three times to ensure stability. Switching halogen-free is a trend, but it must be planned together with molds.
Follow-up question 2: How do you calculate the allowance for reflow soldering cycles?
According to the actual production line, the furnace is designed with a maximum of two furnaces, three validations, and one buffer reserved. Some reworked boards must survive three times at the third furnace, so the material must survive at three peaks. During verification, record dimensions and coplanarity step by step, making the attenuation curve clear at a glance.
Tracking single warpage
connector warped after passing through the furnace, and the clipping board couldn't be snapped on. After a long investigation, it was found that the packaging box had preheated the material at the furnace edge, and the pre-deformation before passing through the furnace was combined with welding deformation. Rectification involves storing incoming materials away from heat sources and keeping them at a constant temperature before passing through the furnace. The most inconspicuous link in the failure chain is often the last straw breaking tolerances.
Reflow Welded Part Acceptance Third Check
Peak Survival Records, Furnace-by-Furnace Coplanarity Curves, Halogen-Free or Flame-Retardant Documents. Only when all three checks are complete, the SMT checkpoint is truly secure.
's knowledge map can be summed up in one sentence: furnace temperature is the test paper, material is the test, and coplanarity is the report card. Candidates' strength depends on high-temperature data, their scores depend on assembly tolerances, the test papers get harder every year, and the material accounts must be recalculated every year.
SMT Connectors There's another related topic: the coplanarity race for board-to-board connectors. Move the terminal spacing below 0.4, and cut coplanar tolerances in half. The high-temperature dimensional stability of materials has changed from a bonus point to a passing line. In the selection lists of several leading connector manufacturers, dimensional drift data before and after reflow soldering is explicitly required. This trend sends a clear signal to the material side: high-temperature data should be analyzed for the full temperature range, not just single points. Preparing the full temperature domain data package when quoting new projects greatly improves evaluation efficiency.
production side also has a synergy point: moisture sensitivity level management. After the connector absorbs moisture and passes through the furnace, it bubbles, known in the industry as the popcorn effect. Materials are managed according to moisture sensitivity levels, with timed reheating after unpacking. Some factories have made this into a Kanban system, with each package having an electronic clock that automatically locks over time. Moisture sensitivity management and reflow resistance selection are two sides of the same coin: lower moisture absorption at the material end reduces clock pressure on the production line. Only by working together at both ends does the straight-through rate have room for efficiency. If procurement asks about moisture absorption during material selection, the production line management costs will immediately change.
Checklist Summary
Reflow Soldering Parts Fixed-Point Resource Package Suggestions Five-Piece Set: Full Temperature Range Dimensional Curve, Furnace-by-Furnace Coplanarity Data, Moisture Sensitivity Level Certificate, Halogen-Free or Flame-Retardant Documents, Terminal Coplanar Verification Report. Suppliers with a complete five-piece set are synonymous with reliability in the connector industry. Fixed-point equipment in the electronics industry is increasingly like an exam; the five-piece set is the admission ticket.
The connector industry also has a color coding detail. Different circuits use different connector casings to prevent misalignment. Masterbatch affects reflow soldering performance; darker colors absorb more heat and have higher temperatures at peak times. Some factories have black parts passing normally after passing through the furnace, but light-colored parts have problems. Investigation reveals that the temperature resistance rating of light-colored formulas is half a level lower. Changing colors without verification is a hidden pitfall in the connector industry. Color changes should also be included in the change management checklist; this experience is worth writing into every connector manufacturer's quality manual.
Don't miss any verification at the assembly end either. When inserting connectors into PCBs, insertion and removal force is determined by barbed hooks and hole tolerances. After passing through the furnace, dimensional changes in the plastic affect insertion and pull-out force; too little force causes poor contact, too much force makes board assembly difficult. During verification, measure both insertion and removal forces before and after passing through the furnace and hand the data to the customer. The competitiveness of electronic components lies in these two-page data packages. The thicker the data package, the easier the customer's design and naturally the more sticky the order.
gives a sorting suggestion to engineers selecting materials: first filter out a batch based on peak survival and coplanarity, then use CTI and flame-retardant screens for the second round, and finally compare moisture absorption and price. After completing four funnel layers, the remaining two or three grades are used for trial production comparison. Selection efficiency isn't about how quickly you check, but about how decisively you eliminate them. If you write the elimination criteria for each funnel layer in advance, there's no turning back at the review meeting.
Reflow Soldering Connectors also has a new cost accounting calculation. High-temperature materials are half as expensive as general ones, but they eliminate the steps and labor of through-hole insertion. The increase in SMT straight-through rate is converted to money, and after a year, it far exceeds the material price difference. Some factories even made a single sheet of this account for customers, significantly increasing the approval rate for designated locations. The value of plastic parts is about factoring in the benefits on the process side as well. The era of focusing solely on material price comparison is being eliminated by comprehensive cost accounting.
adds another inventory perspective: High-temperature nylon has stricter shelf life management than general materials, absorbs moisture quickly, and must be used up after opening. The warehouse manages with a dual-track first-in-first-out plus opening timing, reducing waste immediately. Material timeliness management and material selection are equally important; good material management can still compromise performance. Material managers in electronics factories should treat the temperament of high-temperature materials as a required course.
reminds everyone at the end of selection: connector technology iterates quickly, and material re-inspection cycles are shorter. A full two-year round of re-inspection is much cheaper than troubleshooting after an incident. There is no one-size-fits-all selection for electronic components, only dynamic selection that keeps pace with iterations. Including re-inspection in the annual quality plan is a basic quality quality for connector suppliers.
Conclusion
SMT Connectors use nylon, but there are actually only three chains:
Temperature resistance depends on peak value and number of cycles, warpage depends on orientation and structure, gas explosion depends on dryness and moisture content.
Separate three wires make it easier to locate the problem; If you discuss them together, you can only rely on repeated testing.
If you have a connector struggling with the process of passing through the furnace, send me three things: furnace temperature curve, component structure and gate scheme, and post-furnace performance.
Three lines clarify who we are:
Modified performance—modified nylon (PA6 / PA66 / PA46 / PA11 / PA12 / PA6T / PA9T and nylon alloys), modified PPO / PPS / thermoplastic elastomers;
Stocked—major chemical giants have nylon resin, sub-brand materials, and bulk materials in stock;
Judgment—what parts, what materials to use
