84 微波炉与烤箱内部件：长期 200℃ + 蒸汽 + 微波能怎么选
一、加热设备件的工况
微波炉内部件（转盘、支架、耦合件）：
长期 100-200℃。
蒸汽（加热食品时）。
微波场。
食品接触（合规）。
烤箱内部件（支架、转叉、把手环）：
长期 250℃，短时 300℃。
蒸汽 + 油脂。
食品接触。
这两类件工况不同，但都涉及长期高温 + 食品接触这一主轴。
烤箱厂的高温测试间里，最有画面感的一幕是开炉门：两百三十度的腔体，支架与转盘架在里面已经跑了四小时。有个测试工程师形容，开炉门那一瞬间的热气扑脸，让你瞬间理解什么叫长期耐温。
他们的内部支架经历过一轮换料：普通增强 PA5T 系方案在反复高低温循环后尺寸漂移，转盘架的卡爪松了。换成半芳香族高温体系后，两千次循环纹丝不动。
工程师的说法很朴素：微波炉的转盘天天转，烤箱的支架天天烤，这些件的一天等于别件的十年。
二、微波炉内部件
① PPS（玻纤）
天然阻燃 + 耐 200℃。微波炉转盘支架的主流方案。
② PPA-GF30
耐温 200℃ + 阻燃。比 PPS 略便宜。
③ PA66-GF30 + 阻燃
性价比方案，只用 150℃ 以下工况。
三、烤箱内部件
烤箱温度更高，塑料几乎用不了（多数件是金属或玻璃）。少数塑料件：
① PPS（玻纤）
少数能稳到 250℃ 的塑料，但长期寿命仍有衰减。
② PEI（聚醚酰亚胺）
耐温更高（170-200℃），透明件可用，常用于烤箱门把手。
③ PEEK
耐温最高，但单价是普通塑料的 10 倍，仅用于特定高端烤箱。
四、关键性能对照
| 指标 | PA66-GF30 | PPA-GF30 | PPS-GF40 | PEI | PEEK |
|---|
| 长期耐温 | 120-150℃ | 160-200℃ | 200-240℃ | 170-200℃ | 240-260℃ |
| 阻燃 | 加阻燃 | 加阻燃 | 天然 V0 | 加阻燃 | 天然 |
| 食品级 | 容易 | 中 | 中 | 中 | 容易 |
| 单价 | 1.0× | 3.0× | 5.0× | 6.0× | 15× |
| 微波场 | 透过 | 透过 | 部分吸收（碳黑） | 透过 | 透过 |
五、四个常见坑
① PA66 用在烤箱内部件
PA66 在 150℃ 长期就已经开始降解。微波炉 100℃ 工况勉强可用，烤箱 200℃ 工况完全不能用。
② 玻纤选用错误
含碳黑的玻纤（黑色 PA66-GF）会吸收微波能量，对微波炉转盘来说是灾难。微波炉件要用"低介电 + 透微波"配方。
③ 食品级未核实目录
PPS、PPA 在食品气相空间的合规配方有限。采购时要书面确认"目录号 + 配方号"。
④ 蒸汽环境未做水解测试
蒸汽 + 高温是双刃剑——PPS 在蒸汽环境中也可能缓慢水解。样品阶段要 1000 小时蒸汽老化。
六、边界声明
| 工况 | 建议 |
|---|
| 微波炉转盘支架 | PPS-GF40（穿透波） |
| 微波炉耦合件 | PPS 或 PPA-GF30 |
| 烤箱支架/把手指环 | PEI（透明 + 耐温） |
| 烤箱高温件 | 金属 / PEEK |
| 长期 ≤150℃ | PA66-GF30 + 阻燃 |
| 食品接触合规件 | 确认配方目录号 |
一次转盘架的尺寸漂移
起点是微波炉转盘架用普通 PA66-GF30，标称耐温够，打样顺利。
潜伏期一个月的寿命测试没发现。爆发在用户端：高频使用半年后，个别机器转盘异响，支架卡爪间隙变大。
排查结论：反复蒸汽加热与冷却循环让吸水膨胀与热收缩交替作用，配合间隙被吃掉。普通 PA66 的吸水在这里成了放大器。
结算动作：换低吸水高温体系、卡爪加金属弹片补偿、湿热加高温双循环测试进验收。改版后批量稳定。
加热类家电的会议，三个追问。
追问一：局部峰值温度多少？ 腔体内件按热源距离分档，别用平均温度。
追问二：接触食物或油脂吗？ 接触件走食品接触，油脂件加耐油验证。
追问三：蒸汽环境算了吗？ 微波炉的蒸汽与烤箱的干热是两条验收线。
延伸：常见问题与排查
加热设备件常见问题集中在四类：
问题一：微波炉转盘玻纤发热
含碳黑的玻纤 PA66-GF 在微波场吸热升温，塑料件熔化变形。第一步：换 PPS（不吸微波）；第二步：玻纤配方全部加碳黑含量控制。
问题二：烤箱支架长期脆化
普通 PA66 在 200℃ 长期 1-2 年就开始脆化。第一步：换 PEI 或 PEEK；第二步：确认耐温等级（V-0 + 长期 200℃ 双验证）。
问题三：蒸汽老化后性能下降
PPS 在蒸汽 + 高温下缓慢水解。第一步：1000 小时蒸汽老化测试；第二步：不合格时换 PEI 或 PEEK（蒸汽耐受更好）。
问题四：食品级合规问题
PPS、PPA、PEI 的食品级目录各不相同，采购时要按"目录号 + 配方号"双确认。通用塑料代替食品级是常见错误。
这四条之外还有"微波场验证"——塑料件在微波场里要测温升（5 分钟工作温度上升 ≤20℃），超过的换低介电损配方。
实战：四个工程测试
测试一：微波场温升验证。5 分钟微波加热，塑料件温升 ≤20℃。含碳黑的 PA-GF：温升 60-80℃ 直接出局。
测试二：200℃ × 1000 小时热老化。烤箱工况，PA66：500 小时已脆化；PEI / PEEK：1000 小时后保留率 ≥85%。
测试三：蒸汽老化 1000 小时。蒸汽 + 高温，PPS 1000 小时后水解明显；PEI / PEEK 蒸汽耐受显著好。
测试四：食品级合规。目录号 + 配方号 + 报告。微波炉 PPS、烤箱 PEI 配方 各自有专项。
关键提示
微波炉与烤箱件量产前塑料件温升验证 + 200℃ × 1000 小时热老化 + 蒸汽 1000 小时老化测试三件套都要做。缺一项长期使用都会失效。微波炉要换 PPS，烤箱要换 PEI / PEEK。
工程备忘
微波炉与烤箱件的"耐 200℃ + 蒸汽 + 微波 + 食品"是不可替代的工况。微波炉要换 PPS（不吸微波），烤箱要换 PEI 或 PEEK。通用 PA66 在 150℃ 以上已失效。
行业感
微波炉与烤箱塑料件的"耐 200℃ + 蒸汽 + 微波 + 食品"是不可替代的工况。通用 PA66 在 150℃ 以上已失效。
收尾补一张三问三答。
| 高频问题 | 一句话回答 |
|---|
| 腔体内件选什么？ | 200℃ 以下低吸水高温体系，以上看半芳香族 |
| 转盘架怎么配？ | 耐磨加低吸水，配合公差留漂移量 |
| 外壳为什么不能同料？ | 外壳常温，同料是浪费预算 |
| 食品接触要吗？ | 触及食物与油雾溅到的位置都要 |
补一个高低温循环的验证细节： 加热家电的失效大头不在高温驻留，而在循环——加热与冷却之间的往复会让配合件一胀一缩，疲劳从这里来。验证方案建议把循环次数写死，比如两千次起，比单点高温更有预测力。有厂子只测高温不测循环，新品上市三个月就遭遇卡爪松动的集中投诉，补测补到的循环数正好落在两千次附近。循环这个数字，值得每个加热家电项目写在验收第一行。
深一层：加热家电的现场知识
加热类家电的材料工作有个铁律：腔体内没有常温件。微波炉、烤箱、空气炸锅的内部，哪怕是角落位置，长期工作温度也在一百二十度以上，峰值更高。这个铁律决定了内部件的选型起点是高温体系，而不是通用体系。
有新入行的工程师按常温件的价格习惯选料，打样在高温循环里全军覆没，重新选型耽误了一个月的排期。腔体内外两个世界，进腔体先换脑子。
蒸汽是微波炉工况的主角：食物加热产生的水汽在腔体内循环凝结，件反复经历干湿交替。吸水率高的料在这种循环里尺寸漂移明显，配合件相互卡滞。低吸水体系在这里不是加分项，是入场券。
有客户的转盘支架用普通料打样，蒸汽循环测试五十次后配合间隙变了，换低吸水体系后两百次稳定，这组对比数据后来成了他们的内部教材。
油脂飞溅在烤箱里是常态：烤肉时油滴溅到内壁与支架，高温下油脂氧化变稠附着，定期擦拭的清洁剂又是另一重化学环境。内部件的耐油与耐清洗验证要一起做，顺序是先油后碱，模拟真实的"脏了再洗"循环。
单测油或单测碱都过关的方案，在循环组合里翻车过的项目，我们自己就见过。
转盘机构还有机电配合的问题：转盘电机通过联轴器带动玻璃盘，塑料联轴套承受的是正反转的交变扭矩。这类小件的材料要求是尺寸精度加耐磨，通常用低吸水的耐磨体系。
小件的单价低，但坏了的表现是转盘不转或异响，用户的第一反应是机器坏了而不是小件坏了，售后成本远超件价。小件的材料标准不能因为便宜就放松。
空气炸锅是近年增长最快的品类，它的工况比烤箱更极端：热风高速循环，腔体温度更高，油脂飞溅更猛。热风口的塑料导流件，长期处于高温高速气流里，要求耐温加低磨损。这个品类的材料方案比传统烤箱高半档，选型时不能照抄烤箱的料单。
新品类的工况表要重新建，抄旧品类是偷懒，偷懒的代价会在售后数据里补回来。
验证设备的选择也有讲究：加热家电的循环测试，行业里常用的是温箱加湿度控制的组合，但真实工况里的蒸汽是局部的、脉冲式的，与温箱的均匀环境不同。有条件的厂子用整机做循环，比单纯用温箱的数据更接近真实。
整机循环测试的成本高，但它的数据能直接指导配合公差的设计，省掉的是打样返工的轮次。
说一个设计端的配合建议：加热腔体内的塑料件，配合公差按"最大膨胀 + 最大吸水膨胀"的叠加来留，很多失效不是材料不行，是公差没给两种膨胀留位置。有客户的门钩组件按这个原则重新分配公差后，两代机型的门体异响问题同时消失。
材料选对只是及格线，公差留对才是满分卷。
最后讲讲加热家电的分级选材：直接接触食物的件走食品接触加高温，腔体内不接触的件走高温加耐蒸汽，外壳件走常规阻燃耐候。三档的价格差能到三倍，分级画准了，整机的材料成本能省一成以上，而不牺牲任何一处的可靠性。
加热家电的材料工作，做的是温度地图上的分区预算，不是一刀切的价格战。
加热家电的门体组件是腔体与外界的边界，材料方案最讲究：门玻璃边框要耐温、把手要低温可触、铰链座要抗蠕变，一个门上三套逻辑。门钩与门开关的可靠性直接关联安全，行业里对门钩件的验证是最严的一档，寿命循环之外还要做跌落与误操作测试。
有个客户的新品门钩在误操作测试里断裂，原因是用户会用手压门体借力，这个动作写进工况后加了静载测试项，改版一次通过。
把用户的真实动作当成工况来源，是家电材料工作里最便宜的创新来源，也是最难的一步，因为它需要有人去现场看用户怎么用机器。
结语
微波炉与烤箱内部件的核心是"耐温 + 微波 + 食品"三件套。别用通用 PA66，它在 150℃ 以上长期就已经在分解。要做微波炉就选 PPS 或 PPA，要做烤箱就选 PEI 或 PEEK。
十几年，只做一件事：把尼龙改成能用的样子。
家电加热设备件长期料号选择，可以一起聊。
84 Microwave and Oven Components: Long-term 200℃ Steam Microwave, How to Choose
1. Operating Conditions of Heating Equipment Components
Microwave oven internal components (turntable, bracket, coupler):
Long-term 100-200°C.
Steam (when heating food).
Microwave field.
Food contact (compliant).
Oven internal parts (racks, rotisserie forks, handle rings):
250°C for long-term, 300°C for short-term.
Steam Grease.
Food contact.
These two types of components have different working conditions, but both involve long-term high temperatures and the main aspect of food contact.
In the high-temperature testing room of the oven factory, the most visually striking moment is opening the oven door: a 230-degree chamber, with the rack and turntable inside having been running for four hours. One test engineer described that the blast of heat hitting your face the moment you open the oven door instantly makes you understand what long-term heat resistance means.
Their internal brackets went through a round of material replacement: the conventional reinforced PA5T system experienced dimensional drift after repeated high and low temperature cycles, and the clamps on the turntable frame became loose. After switching to a semi-aromatic high-temperature system, they remained perfectly stable after two thousand cycles.
The engineer's words are very simple: the microwave's turntable rotates every day, the oven's rack bakes every day, a day for these parts equals ten years for other parts.
2. Microwave Oven Internal Components
① PPS (Glass Fiber)
Naturally flame-retardant, resistant to 200°C. The mainstream solution for microwave turntable supports.
② PPA-GF30
Temperature resistant up to 200℃, flame retardant. Slightly cheaper than PPS.
③ PA66-GF30 Flame Retardant
Cost-effective solution, only for operating conditions below 150℃.
3. Oven Internal Components
The oven temperature is higher, so plastic can hardly be used (most parts are metal or glass). A few plastic parts:
① PPS (Glass Fiber)
Only a few plastics can remain stable at 250℃, but their long-term lifespan still degrades.
② PEI (Polyetherimide)
Higher temperature resistance (170-200°C), can be used for transparent parts, commonly used for oven door handles.
③ PEEK
Has the highest temperature resistance, but its unit price is 10 times that of ordinary plastic, and it is only used for specific high-end ovens.
4. Key Performance Comparison
| Indicator | PA66-GF30 | PPA-GF30 | PPS-GF40 | PEI | PEEK |
|---|
| Long-term temperature resistance | 120-150℃ | 160-200℃ | 200-240℃ | 170-200℃ | 240-260℃ |
| Flame retardant | Added flame retardant | Flame Retardant Added | Natural V0 | Flame retardant | Natural |
| Food grade | easy | middle | middle | middle | Easy |
| Unit price | 1.0× | 3.0× | 5.0× | 6.0× | 15× |
| Microwave field | Through | Through | Partial absorption (carbon black) | Through | Through |
5. Four Common Pitfalls
① PA66 is used in oven interior components
PA66 begins to degrade over the long term at 150℃. It can barely be used in a microwave at 100℃, and it cannot be used at all in an oven at 200℃.
② Wrong selection of fiberglass
Carbon black-containing fiberglass (black PA66-GF) absorbs microwave energy, which is disastrous for microwave turntables. Microwave parts need a 'low dielectric, microwave-transparent' formulation.
③ Food-grade unverified catalog
PPS and PPA have limited compliant formulations for the food vapor phase. When purchasing, the "Catalog Number Formula Number" must be confirmed in writing.
④ Hydrolysis test not performed in steam environment
Steam and high temperature are a double-edged sword—PPS may also slowly hydrolyze in a steam environment. The sample stage requires 1000 hours of steam aging.
6. Boundary Declaration
| Operating condition | Suggestion |
|---|
| Microwave turntable support | PPS-GF40 (Through-Wave) |
| Microwave Coupler | PPS or PPA-GF30 |
| Oven Rack/Handle Ring | PEI (transparent, heat-resistant) |
| High-temperature parts of the oven | Metal / PEEK |
| Long-term ≤150℃ | PA66-GF30 Flame Retardant |
| Food contact compliant components | Confirm the formula catalog number |
A single turntable frame size drift
The starting point is the microwave turntable rack made of regular PA66-GF30, with a nominal temperature resistance that is sufficient, and the prototyping went smoothly.
No issues were found during the one-month incubation period life test. The outbreak occurs on the user side: after six months of high-frequency use, some machines have abnormal noises from the turntable, and the gaps between the rack claws increase.
Investigation conclusion: Repeated steam heating and cooling cycles caused alternating water absorption expansion and thermal contraction, which consumed the clearance. The water absorption of ordinary PA66 acted as an amplifier here.
Settlement actions: switch to a low water absorption high-temperature system, add metal spring clips to the clamps for compensation, and conduct wet-heat plus high-temperature double cycle testing before acceptance. After revision, the batch is stable.
A meeting on heating appliances, three follow-up questions.
Follow-up question 1: What is the local peak temperature? Classify the cavity components according to their distance from the heat source, and do not use the average temperature.
Follow-up Question 2: Does it come into contact with food or grease? Parts that come into contact with food follow food contact regulations, and greasy parts are verified for oil resistance.
Follow-up Question 3: Does the steam environment count? The steam from a microwave oven and the dry heat from an oven are two separate acceptance criteria.
Extension: Common Problems and Troubleshooting
Common problems with heating equipment parts are concentrated in four categories:
Question 1: Microwave turntable fiberglass heating
Carbon black-containing glass fiber PA66-GF absorbs heat and rises in temperature in a microwave field, causing plastic parts to melt and deform. Step one: switch to PPS (does not absorb microwaves); step two: control the carbon black content in all glass fiber formulations.
Question 2: Long-term brittleness of the oven rack
Ordinary PA66 starts to become brittle after 1-2 years at 200°C. Step one: switch to PEI or PEEK; Step two: confirm the temperature resistance rating (V-0, long-term 200°C, dual verification).
Question 3: Performance degradation after steam aging
PPS slowly hydrolyzes under steam and high temperatures. Step one: 1000-hour steam aging test; step two: if it fails, replace with PEI or PEEK (better steam resistance).
Question 4: Food-grade compliance issues
The food-grade catalogs of PPS, PPA, and PEI are different. When purchasing, you need to double-check according to "catalog number formulation number." Using general plastics instead of food-grade is a common mistake.
In addition to these four points, there is also 'microwave field verification' — the temperature rise of plastic parts in the microwave field must be measured (temperature rise during 5 minutes of operation ≤20°C); if exceeded, switch to a low dielectric loss formulation.
Practical Exercise: Four Engineering Tests
Test 1: Microwave field temperature rise verification. 5 minutes of microwave heating, plastic parts temperature rise ≤20℃. PA-GF containing carbon black: temperature rise 60-80℃ leads to immediate disqualification.
Test 2: 200℃ × 1000 hours thermal aging. Oven conditions, PA66: embrittled after 500 hours; PEI / PEEK: retention rate ≥85% after 1000 hours.
Test 3: Steam aging for 1000 hours. Steam at high temperature causes obvious hydrolysis of PPS after 1000 hours; PEI/PEEK show significantly better steam resistance.
Test Four: Food-grade compliance. Catalog number Formula number Report. Microwave PPS, Oven PEI formulas each have their own special section.
Key Tips
Microwave oven and oven plastic parts temperature rise verification before mass production. 200℃ × 1000 hours of thermal aging. Steam 1000 hours aging test. All three tests must be done. Missing any one will cause failure during long-term use. Microwave ovens need to switch to PPS, ovens need to switch to PEI/PEEK.
Engineering Memo
For microwave ovens and ovens, the conditions of 'resisting 200°C, steam, microwave, and food' are irreplaceable. Microwave ovens need to switch to PPS (does not absorb microwaves), while ovens need to switch to PEI or PEEK. General PA66 fails above 150°C.
Industry sense
The 'resistant to 200°C, steam, microwave, and food' conditions for plastic parts of microwave ovens and ovens are irreplaceable. General PA66 fails above 150°C.
Finish off with one more sheet of three questions and three answers.
| Frequently Asked Questions | Answer in one sentence |
|---|
| What should be selected for the cavity components? | Low water absorption high-temperature system below 200℃, above looks semi-aromatic |
| How to match a turntable stand? | Wear-resistant and low water absorption, with tolerance left for drift |
| Why can't the shell be made from the same material? | The casing is at room temperature, using the same material is a waste of budget |
| Does it need to be food contact? | All areas that come into contact with food and where oil splashes must be |
Supplementing a detail on high-low temperature cycling verification: The main cause of failure in heating appliances is not dwelling at high temperature, but cycling — the repeated expansion and contraction between heating and cooling causes fatigue in the fittings. The verification plan is recommended to fix the number of cycles, for example starting at two thousand cycles, which is more predictive than a single high temperature point. Some manufacturers only test high temperature without cycling, and three months after the launch of a new product, they face concentrated complaints of latch looseness. The supplementary test revealed a cycle count that happens to be around two thousand. This cycle number is worth putting in the first line of acceptance criteria for every heating appliance project.
A Deeper Look: On-Site Knowledge of Heating Appliances
There is a strict rule in the material work of heating appliances: there are no room-temperature parts inside the cavity. The interior of microwaves, ovens, and air fryers, even in corner areas, has a long-term operating temperature above 120 degrees, with even higher peaks. This rule determines that the starting point for selecting internal components is a high-temperature system, not a general-purpose system.
Some newly hired engineers choose materials according to the prices of room-temperature parts out of habit, and the prototypes all fail during high-temperature cycling, causing a one-month delay in the schedule due to re-selection. Inside and outside the cavity are two different worlds; before going into the cavity, you need to change your mindset.
Steam is the main player in the working conditions of a microwave: the water vapor produced by heating food circulates and condenses inside the cavity, causing the items to repeatedly go through cycles of wetting and drying. Materials with high water absorption show significant dimensional changes in this cycle, leading to jamming between assembled parts. Low water absorption systems are not a bonus here; they are the entry ticket.
The customer's turntable bracket was prototyped using regular material. After fifty cycles of steam circulation testing, the fitting clearance changed. After switching to a low water absorption system, it remained stable after two hundred cycles. This set of comparative data later became part of their internal training material.
Grease splattering in the oven is normal: when roasting meat, oil droplets splash onto the inner walls and racks, and under high temperatures, the grease oxidizes and thickens, adhering to surfaces. Regularly used cleaners create yet another chemical environment. Resistance testing for both grease and cleaning on internal parts must be done together, in the sequence of oil first, then alkaline, simulating the real 'get dirty then clean' cycle.
We ourselves have seen projects that passed when testing only acid or only alkali, but failed during cyclic combination tests.
The turntable mechanism also has an electromechanical coordination issue: the turntable motor drives the glass plate through a coupling, and the plastic coupling sleeve bears alternating torque in forward and reverse directions. The material requirements for such small parts are dimensional accuracy and wear resistance, usually using a low water-absorption wear-resistant system.
The unit price of small parts is low, but when they break, the symptoms are that the turntable does not rotate or makes abnormal noises. The user's first reaction is that the machine is broken, not the small part, and the after-sales cost far exceeds the price of the part. The material standards for small parts should not be relaxed just because they are cheap.
Air fryers are the fastest-growing category in recent years, and their working conditions are more extreme than those of ovens: high-speed hot air circulation, higher chamber temperatures, and more intense oil splattering. The plastic air guide components at the hot air outlet are exposed to high-temperature, high-speed airflow for long periods, requiring heat resistance and low wear. The material solutions for this category are a half-step higher than traditional ovens, and the material selection cannot simply copy the oven's bill of materials.
A new category's working condition table needs to be created from scratch. Copying an old category is lazy, and the cost of laziness will be paid back in after-sales data.
The choice of verification equipment also requires careful consideration: for cyclic testing of heating appliances, the industry commonly uses a combination of temperature chambers with humidity control. However, the steam in real working conditions is localized and pulsed, which is different from the uniform environment of a temperature chamber. Factories with the necessary conditions use the complete machine for cycling, which is closer to reality than simply using data from a temperature chamber.
The cost of full machine cycle testing is high, but its data can directly guide the design of mating tolerances, saving the rounds of prototype rework.
Here is a design-side coordination suggestion: For plastic parts inside a heated chamber, allow tolerances according to the cumulative 'maximum thermal expansion + maximum water absorption expansion.' Many failures are not due to material issues, but because tolerances did not account for both types of expansion. After a customer's door latch assembly had its tolerances redistributed based on this principle, the door noise issue disappeared in two generations of machines simultaneously.
Choosing the right materials is just the passing mark; leaving the right tolerance is the full-score paper.
Finally, let's talk about the graded selection of materials for heating appliances: components that directly contact food are made of food-contact grade high-temperature materials, parts inside the cavity that do not contact food use high-temperature and steam-resistant materials, and the outer shell uses conventional flame-retardant and weather-resistant materials. The price difference among the three grades can be up to three times. If the grading is done accurately, the material cost of the entire machine can be reduced by more than 10% without sacrificing the reliability of any part.
The work with materials for heating appliances involves budgeting by zones on the temperature map, not an across-the-board price war.
The door assembly of heating appliances is the boundary between the cavity and the outside. The material selection is very particular: the door glass frame must be heat-resistant, the handle must be safe to touch at low temperatures, and the hinge seat must resist creep—three sets of logic on a single door. The reliability of the door latch and door switch is directly related to safety. In the industry, the verification of door latch components is the strictest; in addition to lifecycle testing, drop and misuse tests must also be conducted.
A client's new product door latch broke during the misuse test because users would press down on the door to get leverage. Once this action was included in the usage scenario and a static load test was added, the redesign passed in one go.
Considering the user's real actions as a source of usage scenarios is the cheapest source of innovation in appliance materials work, and also the most difficult step, because it requires someone to observe users using the machine on site.
Conclusion
The core components of microwave ovens and ovens are the 'heat, microwave, food' trio. Do not use general PA66; it decomposes when exposed to temperatures above 150°C for a long time. For making microwaves, choose PPS or PPA; for ovens, choose PEI or PEEK.
For more than ten years, only one thing has been done: turning nylon into a usable form.
We can talk about long-term material selection for heating appliance components together.
