175 储能液冷板与管路件
液冷系统的工况清单
储能液冷板里流的是乙二醇水溶液（50:50），工作压力 1.5-3 bar，温度 20-50℃，要求 10 年以上不漏。
塑料件主要是管路、快插接头、阀体、分水器、传感器座。失效形式是渗漏和应力开裂，渗漏会导致电池包短路，后果严重。
耐乙二醇水解是核心
PA66 在热水和醇类环境中会水解，分子链断裂导致强度下降。
50% 乙二醇水溶液在 60℃ 下，普通 PA66 两年强度下降 40%。
必须走耐水解牌号——加碳二亚胺类抗水解剂，或者直接用 PA12。
PA12 的耐水解性远优于 PA66，但单价高一倍，一般只用在关键接头上。
现场还原：液冷板接头上的结晶物
2025 年 5 月，常州一家储能集成商的售后实验室，我们看到了一只拆下来的液冷板快插接头：接口内壁挂着一层白色结晶，密封圈已经压扁失弹。这只接头来自某储能电站，服役十四个月，冷却液是乙二醇水溶液。
泄漏路径还原：接头本体用的是普通 PA66-GF30，长期泡在 50% 乙二醇加缓蚀剂的工况里，基材发生醇解和水解，玻纤和基材的结合面率先劣化，尺寸微胀，密封压缩应力跟着衰减——结晶物是冷却液渗出后蒸发留下的残渣。
普通 PA66 的耐水解数据是按 80℃ 水做的，乙二醇体系加 60℃ 长期浸泡是另一道题：醇对小分子尼龙有增溶和塑化作用，水解速率比纯水高，这个数据很多料商的物性表上没有，要有专门的乙二醇浸泡报告。
我们给的是耐水解专用 PA66 改性牌：按 50% 乙二醇 85℃ 3000 小时浸泡做验证，拉伸保持 85% 以上，密封面尺寸变化小于 0.1%。
储能液冷这条线，泄漏是比起火更常见的现场问题——漏一次液，修的是接头，赔的是整个 Pack 的停运。
快插接头的难点
快插接头是塑料件里最难的一个：要承受插拔力、内压、振动、还要守住密封。
接头本体走 PA66-GF30 耐水解，密封圈走 EPDM 或硅胶，锁扣走 PA66-GF25 增韧。
锁扣是失效高发点——振动下锁扣松脱，接头弹出。必须做振动 + 压力脉冲的联合验证。
应力开裂的隐蔽性
液冷件最阴险的失效是环境应力开裂：材料本身没问题，但在内应力（注塑残余 + 装配应力）和化学介质的共同作用下，
几个月后突然开裂。对抗手段有三：降低注塑残余应力（提高模温、降低保压）、做退火处理、选耐水解牌号。这三件做到两件，风险就大幅下降。
深一层：应力开裂——液冷件最阴险的失效模式
液冷塑料件的三种典型失效里，老化失效（慢慢变脆）和磨损失效（接头松脱）都好理解，最阴险的是应力开裂：料没老化、载荷没超限，件裂了。
机理拆开看：注塑件内部藏着残余应力——玻纤取向、冷却不均、嵌件周边的收缩差，都在件内部存着拉应力。平时没事，一旦接触特定介质（乙二醇、清洗剂、某些缓蚀剂），介质渗入应力集中区的分子链间隙，局部增塑加溶胀，薄弱位就顺着应力方向裂开。
裂的时候不在任何外力路径上，看起来像「自己裂的」。
液冷件的麻烦在于介质是整包循环的：接头、管路、冷板、水泵壳体泡在同一种液体里，任何一种料不匹配，整条链路都有风险。
所以液冷系统的材料验证必须「成套做」——同一个配方冷却液，把链路上所有塑料件放在一起做长期浸泡加应力加载的复合试验，单一件的独立试验会漏掉配合面的次生应力。
工程上的预防两件事：料选耐水解加耐应力开裂的专用牌；注塑端控制残余应力（退火、浇口优化、嵌件预热）。两头各做一半，事故概率压到可接受区间；只做一头，概率还在原地。
压力脉冲测试是必检项
液冷系统要承受压力循环——泵启停、温度变化都会产生压力波动。
标准验证是压力脉冲测试：1-3 bar 循环 10 万次不渗漏。
接头和管路要一起测，不能分开测——分开测都合格，装在一起可能因为刚度不匹配而渗漏。
这是液冷系统验证中最容易偷懒也最容易出事的一处。
阻燃要求的争议
液冷板在电池包内部，是否需要阻燃一直有争议。支持方认为靠近电芯必须阻燃；反对方认为有冷却液在，本身就是阻燃环境，加阻燃剂反而降低耐水解性。
目前的行业做法是：液冷板本体不强制阻燃，但接头和阀体走阻燃 V-0，兼顾安全和耐水解。
工程实测：4 条强制测试
测试1：乙二醇水解 60℃ 1000 h。耐水解 PA66 强度保持 90%，普通 PA66 降至 60%——必须用耐水解牌号。
测试2：压力脉冲。1-3 bar 10 万次，整体测试渗漏率 0%，分体测试后装机渗漏 8%——必须整体测。
测试3：应力开裂。退火处理后应力开裂时间从 200 h 延长到 1500 h——退火很有效。
测试4：锁扣振动。增韧 PA66-GF25 振动 100 h 无松脱，纯 GF30 在 30 h 松脱。
追问三连：采购最常问的三件事
一问：液冷件必须做哪些非标验证。 三项是底线：乙二醇体系长期浸泡（按实际浓度和最高工作温度）、压力脉冲（冷启停循环，通常 10 万次量级）、应力开裂复合试验（浸泡加弯应力叠加）。三项全做的供应商不多，报价比没做的高两成——这两成是后来不用去现场的钱。
二问：快插接头为什么是最薄弱环节。 接头是「密封加结构加介质」三重受力的交汇点：密封面要尺寸稳、卡扣要抗冲击、本体泡介质要耐水解。三重里任何一重失守都漏液。接头选料要比管路高一档，这是行业共识，但成本压力下经常被拉平——拉平的那一天就是风险的起点。
三问：阻燃要求到底要不要。 液冷回路在 Pack 内部，阻燃要求取决于方案架构：浸没式或贴合电芯的部件按 V-0 走，独立管路部分部分客户接受 V-2 或不强制——但整机消防验收标准在收紧，按 V-0 配置是趋势，报价单上把阻燃当可选项报的，后期大概率返工。### 算一笔材料账：漏液的全包成本
储能液冷系统的漏液成本，行业里习惯只算维修件，把全包成本摊开看，数字大得多。
一次 Pack 级漏液的直接成本：接头更换、冷却液补充、Pack 开盖重装——按一只 Pack 算约 800 元。间接成本：该 Pack 停运期间的容量损失、电站考核、连带排查同批次接头的工时，合计单次 2000 元上下。
如果漏液发生在质保期内且形成批次性：全站同批次接头预防性更换，按 500 只算，一次行动六位数起步。
对照材料侧：耐水解专用接头比通用牌贵 6 元一只，一个电站 3000 只差 1.8 万元。用一次批次性排查的钱，够把这批接头的材料差价付五十年。
所以液冷接头的材料决策，本质不是「省不省 6 块钱」，是「要不要把批次性风险的概率从百分之几压到千分之几」。
储能电站的运维方这几年被漏液教育得很充分，招标文件里对液冷件的验证要求越来越细——供应商的脉冲和浸泡报告，现在就是投标文件里最重的那几页。
边界声明
| 工况 | 推荐材料 |
|---|
| 管路本体 | 耐水解 PA66-GF30 |
| 关键接头 | PA12-GF30 |
| 锁扣件 | PA66-GF25 增韧 |
| 密封圈 | EPDM 或硅胶 |
| 阀体分水器 | 阻燃耐水解 PA66-GF30 |
工程备忘
液冷件量产前必须做乙二醇水解 + 压力脉冲整体测试 + 应力开裂三项。整体测试不能拆成分体测试。
实战案例：常见踩坑与正解
踩坑一：用常规 PA66 做户外液冷管路，没加耐候体系，两年就粉化开裂。正解：光伏储能件的设计寿命是 25 年，必须走专用耐候牌号——UV 吸收剂 + HALS + 抗氧剂三件套缺一不可，并且要 3000 h 氙灯老化验证。踩坑二：只看常温强度不看湿热老化后的强度。液冷管路装在户外，湿热老化 1000 h 后强度保持率低于 70% 的料不能用。正解：拿湿热老化后的数据选料，不拿常温数据选料。踩坑三：为了过认证临时换料，换完没重新做老化验证，批量装机后集中失效。正解：换料号必须重跑全套老化，这是光伏行业的基本规矩。
反向案例：脉冲台上的十万次
2024 年，华南某储能厂做新 Pack 的液冷接头定点，两家供应商进测试：A 家耐水解专用牌，B 家通用增强牌加耐水解剂，常温性能和短期浸泡数据两家几乎打平。
分水岭在压力脉冲台：10 万次冷热冲击脉冲（-20℃ 到 65℃ 介质温度循环加压力波动），A 家三只样件全部通过，密封面尺寸变化小于 0.05%；
B 家在第 4 万次到第 7 万次之间陆续出现渗漏，解剖发现密封面微胀，密封圈压缩应力衰减到位移超限。
B 家的解释是「配方里加了耐水解剂应该没问题」——问题恰恰在于：耐水解剂解决的是化学劣化，脉冲测试考验的是「热胀冷缩反复循环下密封系统的机械稳定性」，两者是不同维度的考题。
定点结果 A 家中标，单价贵 12%。两年后这家 Pack 厂的现场泄漏率数据在行业里排到了第一梯队，他们把那次脉冲测试报告做成了销售工具——对着客户讲十万次曲线，比讲任何参数都有说服力。
液冷件的验证逻辑说穿了很朴素：短期数据人人都好看，分水岭藏在时间维度里，谁肯在测试台上多花两周，谁就把风险提前收走了。### 延伸判断：两个容易混淆的概念
液冷管路的选料讨论里，有两个概念常年被混淆。第一个是阻燃和绝缘。
阻燃解决的是不起火，绝缘和耐电痕化解决的是不爬电不击穿，这是两件事。
一个料可以阻燃 V-0 但 CTI 只有 250 V，装在带电件上照样出事。
第二个是强度和韧性。玻纤增强提高强度但降低韧性，增韧提高韧性但降低强度和刚性。
同一个件上，结构部位要强度，卡扣部位要韧性，一般要分成两种料，图省事用一种料的结果，不是卡扣断就是本体裂。
把这三件事写成一张表发给供应商，比打十通电话有用——液冷管路的选型沟通成本，基本都花在这几项反复确认上。
补记：三个现场判断信号
信号一：接口白色结晶。 微渗漏进行时，泄漏量还不至于报警，但密封系统已在劣化通道上，整批判检比等报警划算。
信号二：密封圈压扁失弹。 查压缩永久变形数据和料圈相容性，换圈之前先验圈——圈的问题换圈，料的问题换圈只是续命。
信号三：管路接头根部环向细裂纹。 应力开裂特征，立即查冷却液配方变更记录和注塑批次，两头都可能肇事，裂纹形态会告诉你答案。### 验证顺序：三步走完再下单
第一步，对介质：冷却液配方、浓度、温度区间拿准，乙二醇体系的验证按实际配方做。
第二步，验脉冲：10 万次压力脉冲加温度循环，密封面尺寸变化数据到小数点后两位。
第三步，验成套：接头、管路、冷板接口的配套件一起泡、一起压，链路验证替代单件验证。三步走完，液冷系统的材料风险就收进了笼子。
结语
料是同一个料，工艺是两套工艺——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。
175 Energy storage liquid cooling plate and piping components
Liquid cooling system operating condition list
Energy storage liquid cooling plate flows with ethylene glycol aqueous solution (50:50), working pressure 1.5-3 bar, temperature 20-50°C, requiring no leakage for more than 10 years.
Plastic parts mainly include pipelines, quick-plug joints, valve bodies, manifolds, and sensor seats. Failure modes include leakage and stress cracking; leakage can cause battery pack short circuits, with serious consequences.
Ethylene glycol hydrolysis resistance is the core
PA66 Hydrolysis occurs in hot water and alcohol environments, causing molecular chain breakage and reduced strength.
50% ethylene glycol aqueous solution at 60°C shows a 40% reduction in strength of ordinary PA66 over two years.
Must choose hydrolysis-resistant grades—add carbodiimide hydrolysis inhibitors, or use PA12 directly.
PA12 has much better hydrolysis resistance than PA66 but costs twice as much and is generally used only for key joints.
On-site reconstruction: crystalline substances on liquid-cooled plate joints
In May 2025, at the after-sales laboratory of an energy storage integrator in Changzhou, we saw a detached liquid-cooled plate quick-plug connector: a layer of white crystals hanging from the interface inner wall, and the sealing ring had been flattened and lost bullets. This connector comes from an energy storage power station, has been in service for fourteen months, and its coolant is ethylene glycol aqueous solution.
Leakage path restoration: The connector body uses ordinary PA66-GF30, which has been soaked for a long time in 50% ethylene glycol with corrosion inhibitors. The substrate undergoes alcohollysis and hydrolysis, causing the bonding surface between the fiberglass and substrate to deteriorate first, with slight dimensional expansion and sealing compression stress attenuating—the crystalline residue is the residue left after evaporation after coolant seepage.
The hydrolysis resistance data for ordinary PA66 is based on 80°C water. Long-term soaking at 60°C in the ethylene glycol system is another issue: alcohol solubilizes and plasticizes small-molecule nylon, with a higher hydrolysis rate than pure water. Many suppliers don't list this data in their physical property tables, so a dedicated ethylene glycol soaking report is required.
We provide a modified PA66 brand specifically for hydrolysis: verified by soaking 50% ethylene glycol at 85°C for 3000 hours, maintaining tensile value above 85%, and the seal surface dimensional change is less than 0.1%.
For the energy storage liquid cooling line, leakage is more common on-site issues than fire—a single leak means repairing the joints and causing the entire pack to shut down.
Challenges with quick-connect connectors
Quick-plug connectors are the most difficult among plastic parts: they must withstand insertion/pull-out forces, internal pressure, vibration, and also maintain the seal.
The connector body uses PA66-GF30 for hydrolysis resistance, the sealing ring uses EPDM or silicone, and the latch uses PA66-GF25 for toughening.
Locks are a high-failure point—when the latch loosens during vibration, the connector pops out. A combined verification of vibration + pressure pulses must be performed.
The Concealment of Stress Cracking
The most insidious failure of liquid-cooled parts is environmental stress cracking: the material itself is fine, but under the combined action of internal stress (injection molding residue + assembly stress) and chemical media,
suddenly cracks after a few months. There are three countermeasures: reduce injection molding residual stress (increase mold temperature, lower holding pressure), perform annealing treatment, and choose hydrolysis-resistant grades. If you achieve two of these three parts, the risk drops significantly.
Deeper layer: Stress cracking—the most insidious failure mode of liquid-cooled parts
Among the three typical failures of liquid-cooled plastic parts, aging failure (gradually becoming brittle) and wear failure (joint loosening) are easy to understand. The most insidious is stress cracking: the material hasn't aged, the load hasn't exceeded the limit, but the part cracks.
Mechanism Breaking It Down: Residual stress is hidden inside the injection-molded part—fiberglass orientation, uneven cooling, shrinkage differences around the insert—all contain tensile stress inside the part. Normally, once it comes into contact with a specific medium (ethylene glycol, cleaning agents, certain corrosion inhibitors), the medium seeps into the molecular chain gaps in the stress concentration area, causing local plasticization and swelling, causing weak points to crack along the stress direction.
When cracking, it does not follow any external force path, making it look like it "cracked itself."
The problem with liquid-cooled parts is that the medium is a whole package: joints, pipelines, cold plates, and pump casings are all soaked in the same liquid. If any material is mismatched, the entire chain is at risk.
Therefore, material verification for liquid cooling systems must be done as a "complete set"—using the same formula coolant, placing all plastic parts in the chain together for long-term soaking and stress loading composite tests. Independent testing of a single piece will miss secondary stress on the mating surface.
Two engineering precautions: select a special plate resistant to hydrolysis and stress cracking; control residual stress at the injection molding end (annealing, gate optimization, insert preheating). Half at each end, reduce the probability of accidents to an acceptable range; Only one end is done, and the probability remains the same.
Pressure pulse testing is a mandatory checkpoint
Liquid cooling systems must withstand pressure cycles—pump start/stop and temperature changes cause pressure fluctuations.
Standard verification is pressure pulse testing: 1-3 bar cycles 100,000 times without leakage.
Joints and piping must be tested together, not separately—both pass tests, but installing them together may cause leakage due to rigidity mismatch.
This is the most prone to laziness and failure in liquid cooling system testing.
Flame Retardant Requirements Controversy
Liquid cooling plates inside the battery pack, whether flame retardant is necessary has long been debated. Supporters believe that flame retardant must be close to the cell; The opponents argue that with coolant present, the environment is flame-retardant, and adding flame retardants actually reduces hydrolysis resistance.
Current industry practice is: the liquid cooling plate body is not enforced flame-retardant, but the connector and valve body use flame-retardant V-0 to balance safety and hydrolysis resistance.
Engineering Testing: 4 mandatory tests
Test 1: Hydrolysis of ethylene glycol at 60°C for 1000 hours. Hydrolytic resistance PA66 maintains strength at 90%, while ordinary PA66 drops to 60%—hydrolysis-resistant grades must be used.
Test 2: Pressure pulse. 1-3 bars at 100,000 cycles, overall leakage rate is 0%; after split testing, installed machine leakage is 8%—overall testing is required.
Test 3: Stress cracking. After annealing, the stress cracking time was extended from 200 h to 1500 h—annealing was very effective.
Test 4: Lock vibration. Toughening PA66-GF25 vibration showed no loosening after 100 hours, pure GF30 loosened after 30 hours.
Triple Follow-up: The three most frequently asked questions in procurement
First question: What non-standard validation must be done for liquid-cooled parts. These three are the bottom line: long-term immersion in ethylene glycol systems (based on actual concentration and maximum operating temperature), pressure pulse (cold start-stop cycle, usually on the order of 100,000 cycles), stress cracking composite test (soaking combined with bending stress). There aren't many suppliers that do all three things, and their quotes are 20% higher than those that don't—this 20% is the cost of not having to go to the site later.
Question 2: Why is the quick-plug connector the weakest link? The joint is the intersection of the 'seal, structure, and medium' triple force: the sealing surface must be stable in size, the clamp must be impact-resistant, and the body soaked in medium must be resistant to hydrolysis. Any failure in the triple layer will cause leakage. The selection of materials for joints is a notch higher than for piping—this is an industry consensus, but under cost pressure, it's often leveled out—the day it is leveled is the starting point of risk.
ThreeQuestion: Should flame retardant requirements be met? The liquid cooling circuit inside the pack, and flame retardant requirements depend on the solution architecture: immersion or cell lamination components follow V-0, while some independent piping customers accept V-2 or are not mandatory—but the fire safety acceptance standards for the whole machine are tightening, and V-0 configuration is the trend. Flame retardant is listed as an option on the quotation, but rework is likely to be done later. ### Calculate the material count: the all-inclusive cost for liquid leakage
The leakage cost of energy storage liquid cooling systems is usually calculated only as the cost of repair parts in the industry, but when looking at the total packaged cost, the number is much larger.
Direct cost of a single Pack-level leak: connector replacement, coolant refill, Pack reopening and reassembly—about 800 yuan per Pack. Indirect cost: capacity loss during the Pack's downtime, power plant assessment, and labor hours for inspecting other connectors of the same batch, totaling around 2000 yuan per incident.
If leakage occurs within the warranty period and forms a batch issue: all connectors of the same batch across the station should be preventively replaced, calculated at 500 units, with a six-digit starting cost for a single action.
On the material comparison side: hydrolysis-resistant specialized joints are 6 yuan more expensive per piece than the general brand, and a power station has 3,000 pieces, resulting in a difference of 18,000 yuan. The money spent on a one-time batch inspection would be enough to cover the material price difference of these joints for fifty years.
So the material decision for the liquid cooling connector is essentially not about 'whether saving 6 yuan is worth it,' but about 'whether to reduce the probability of batch risk from a few percent to a few per thousand.'
The operators of energy storage power stations have been thoroughly educated about leakage over the past few years, and the verification requirements for liquid-cooled components in tender documents have become increasingly detailed—the suppliers' pulse and soaking reports are now the heaviest few pages in the bidding documents.
Boundary Declaration
| Operating condition | Recommended materials |
|---|
| Pipeline body | Hydrolysis-resistant PA66-GF30 |
| critical joint | PA12-GF30 |
| Lock fastener | PA66-GF25 Toughened |
| Seal ring | EPDM or silicone |
| Valve body water distributor | Flame-retardant and hydrolysis-resistant PA66-GF30 |
Engineering Memo
Before mass production of liquid-cooled components, it is necessary to perform three tests: ethylene glycol hydrolysis, overall pressure pulse testing, and stress cracking. The overall testing cannot be divided into separate component tests.
Practical Case Study: Common Pitfalls and Correct Solutions
Pitfall 1: Using regular PA66 for outdoor liquid cooling pipelines without adding a weather-resistant system, resulting in chalking and cracking within two years. Correct approach: The design life of photovoltaic energy storage components is 25 years, so you must use a special weather-resistant grade—UV absorbers, HALS, and antioxidants are all indispensable, and a 3000-hour xenon lamp aging test is required. Pitfall 2: Only considering room temperature strength without checking strength after humid heat aging. If the liquid cooling pipe is installed outdoors, materials whose strength retention after 1000 hours of humid heat aging is below 70% cannot be used. Correct approach: Select materials based on data after humid heat aging, not room temperature data. Pitfall 3: Temporarily changing materials to pass certification without redoing aging verification, leading to concentrated failures after mass installation. Correct approach: Any material change must run the full set of aging tests again; this is the basic rule in the photovoltaic industry.
Reverse Case: One Hundred Thousand Times on the Pulse Platform
In 2024, a certain energy storage factory in South China performed a fixed-point test for liquid-cooled connectors on a new Pack, with two suppliers participating: Supplier A with a hydrolysis-resistant dedicated brand, and Supplier B with a general enhanced brand plus a hydrolysis-resistant additive. Both suppliers were almost equal in room-temperature performance and short-term soaking data.
Watershed at the pressure pulse bench: 100,000 thermal shock pulses (temperature cycling of the medium from -20°C to 65°C with pressure fluctuations), all three samples from Company A passed, and the sealing surface dimension change was less than 0.05%.
House B experienced leaks successively between the 40,000th and 70,000th times. Dissection revealed slight swelling of the sealing surface and the compression stress of the sealing ring had decayed to the point that the displacement exceeded the limit.
Company B's explanation is 'Adding a hydrolysis-resistant agent to the formula should be fine' — the problem is precisely that: hydrolysis-resistant agents address chemical degradation, while pulse testing examines 'the mechanical stability of the sealing system under repeated thermal expansion and contraction,' and the two are tests of different dimensions.
The fixed-point result was that Company A was selected, with a unit price 12% higher. Two years later, the on-site leakage rate data of this Pack factory ranked in the top tier of the industry. They turned that pulse test report into a sales tool—showing customers the 100,000-cycle curve was more convincing than any parameter.
The verification logic of liquid-cooled components is actually very straightforward: short-term data looks good for everyone, but the watershed is hidden in the time dimension. Whoever is willing to spend an extra two weeks on the test bench will take the risk away in advance. ### Extended judgment: two easily confused concepts
In the discussion on material selection for liquid cooling pipelines, there are two concepts that are often confused. The first is flame retardant and insulation.
Flame retardancy addresses not catching fire, while insulation and resistance to electrical tracking address not creeping or breaking down; these are two different things.
A material can be flame retardant V-0, but if the CTI is only 250 V, it can still cause problems when installed on live components.
The second is strength and toughness. Glass fiber reinforcement increases strength but decreases toughness, while toughening increases toughness but decreases strength and stiffness.
On the same part, the structural areas need strength, while the snap-fit areas need toughness. Generally, this requires two different materials. If you use one material for convenience, the result is either a broken snap or a cracked main body.
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 of selecting liquid cooling pipelines is basically spent on repeatedly confirming these items.
Supplementary Note: Three On-Site Judgment Signals
Signal 1: White crystalline deposits on the interface. Micro-leakage is occurring, and the amount of leakage is not yet enough to trigger an alarm, but the sealing system is already in a deteriorating path. It is more cost-effective to inspect the entire batch than to wait for an alarm.
Signal 2: The sealing ring is flattened and loses elasticity. Check the data for permanent compression deformation and material compatibility. Before replacing the ring, inspect it first—if the ring itself has a problem, replace it; if it’s the material, replacing the ring only extends its life.
Signal 3: Circumferential fine cracks at the base of the pipeline joint. Characteristic of stress cracking, immediately check the coolant formula change records and injection molding batch, both ends could be responsible, the crack pattern will tell you the answer. ### Verification sequence: complete all three steps before placing an order
Step one, for the medium: get the cooling fluid formula, concentration, and temperature range right, and the validation of the ethylene glycol system should be done according to the actual formula.
Step two, pulse testing: 100,000 pressure pulses with temperature cycling, sealing surface dimension change data measured to two decimal places.
Step three, verify the complete set: soak and press the fittings, pipelines, and cold plate interfaces together, validating the entire chain instead of individual parts. After completing these three steps, the material risks of the liquid cooling system are contained.
Conclusion
The material is the same, but the processes are two different sets—when it comes to selecting materials, the earlier you ask, the less trouble you'll have.
The material selection and mold trial for this type of part can be discussed together.
