二甲基硅油更換供應商的選型與驗證

相同黏度可以作為篩選候選材料的起點，但還不足以確認可以替換。採購時應先核對測試溫度、方法和允許偏差，再根據實際用途比較揮發分、潔淨度、接觸材料及使用表現。最終是否採用，應由小試、試產和成品驗證決定。

如果原料用於潤滑、脫模、阻尼或配方載體，這幾個用途的驗收重點並不相同。先說明硅油在設備或配方中負責甚麼，再比較供應商，通常比只詢問“有沒有同黏度產品”更容易獲得準確答復。

先把黏度數據放在同一條件下比較

兩份資料上的數字一致，可能仍採用不同溫度、單位或方法。運動黏度常用mm²/s或cSt，動力黏度常用mPa·s或cP；兩者換算需要相同溫度下的密度，不能直接把數字一一對應。

詢價和送樣前，應要求雙方明確以下信息：

1. 材料類別及主要組成，確認候選材料屬於同一功能路線。

2. 黏度測試溫度、單位、方法、規格範圍和批次實測值。

3. 數據是典型值、交付限值，還是某批次檢驗結果。

4. 用途、使用溫度、添加量、接觸材料和不能接受的失效現象。

採購規格最好寫明允許範圍與驗收方法，而不是只寫一個標稱數字。典型值用於瞭解產品，不能自動當作每批交付承諾。

同黏度之外，哪些差異值得核對

核對項目	適合怎樣比較	與應用的關係
揮發分及低分子控制	確認測試溫度、時間、方法和客戶指定項目	高溫、密閉或潔淨場景需關注失重及污染
外觀與潔淨度	按用途約定色澤、透明度、顆粒、水分或雜質項目	避免將外觀相近視為潔淨度相同
閃點等安全資料	比較相同方法的數據，並核對有效SDS	用於儲運和工藝風險評估，不能代替使用溫度驗證
相容性與表面殘留	在實際接觸材料和後續工序中試驗	關注密封件變化、遷移及粘接印刷等後續加工
批次一致性	結合COA、留樣和連續批次記錄	判斷供應變化是否會影響加工和成品

按用途確定驗證重點

潤滑用途

在實際摩擦副、負荷、速度和溫度下比較摩擦表現、磨損及補油週期，同時檢查與密封件和周邊材料的相容性。室溫下手感接近，無法說明長期潤滑表現一致。

脫模用途

保持模具、製品材料、塗布方式和用量一致，觀察脫模力、連續脫模次數、模具積垢以及製品表面殘留。若製品還需粘接、噴塗或印刷，應把這些後續工序一起納入驗收。

阻尼用途

在目標溫度範圍內測量實際阻力、回彈或運動時間，檢查溫度循環後的變化和密封狀態。只比較室溫黏度，容易漏掉低溫啓動或高溫阻尼變化。

配方載體用途

按實際混合順序、溫度和添加量，檢查分散、分層、析油及儲存穩定性。涉及塗層或膠黏體系時，還應觀察表面缺陷及粘接表現；涉及電氣用途時，按成品要求增加相應測試。

從樣品到量產怎樣驗證

1. 先約定驗收項目

保留現用材料的有效技術資料、批次記錄和正常生產數據。把客戶投訴或歷史異常轉成可檢查的項目，例如殘留、析油、積垢或阻尼變化。

2. 做同條件對照小試

保留現用材料作為對照。候選材料使用相同設備、添加量、混合順序和測試條件，先不同時調整其他變量。需要改配方時，另列試驗組並記錄原因。

3. 在真實工況下試產

小試達到要求後，再確認放大加工、實際接觸材料和連續運行表現。老化時間、溫度範圍及循環次數應按產品壽命和風險確定，不套用一個通用合格數值。

4. 把結果寫入採購與變更要求

記錄批准的規格、檢測方法、適用工藝和限制條件，約定COA、留樣、批次追溯與變更通知。樣品通過後，還需持續觀察後續交付批次。

判斷依據應是預先約定的接受標準，而不是“看起來差不多”。如果候選材料只通過了某項測試，結論也應限定在這項測試及對應條件內。

向供應商詢價前準備哪些信息

可以先提供非保密的應用摘要：材料用途、目標黏度及測試條件、使用溫度、添加量、接觸基材、目前遇到的問題、目標市場及預計採購量。對揮發物、潔淨度或合規有要求時，應同時說明檢測方法和接受標準。

艾約塔作為有機硅全產業鏈的方案提供者，可圍繞二甲基硅油材料範圍及客戶工況討論候選規格。初步選型後，再核對對應技術資料、安全資料和批次檢驗文件，具體適用性由實際應用驗證確認。

FAQ

Q1 同樣標注黏度，是否可以直接更換供應商？

應先核對單位、溫度、方法及允許偏差，再比較與用途有關的指標。未經應用驗證，不宜僅憑標稱黏度決定替換。

Q2 cP和cSt能直接對照嗎？

不能只按數字對照。cP是動力黏度單位，cSt是運動黏度單位，換算需要同溫度下的密度。

Q3 COA中的黏度合格，是否說明使用效果也合格？

COA反映所列項目的批次結果，不能覆蓋全部應用表現。脫模、潤滑、阻尼和配方穩定性仍需相應試驗。

Q4 小試通過後可以立即全面切換嗎？

應按風險完成放大試產和成品驗證，明確批次追溯及變更要求後再決定切換範圍。

Q5 普通工業用途需要檢測所有雜質項目嗎？

檢測清單由用途及風險決定。高溫、電子、食品接觸等場景的要求可能不同，應先明確成品要求，再約定相關檢測和文件。

Q6 沒有原供應商的完整資料，怎樣開始？

可先用正常生產留樣及現有工況建立基線，再與供應商確認材料類別、黏度條件和關鍵指標。資料缺口應記錄，不能把推測當作既定規格。

English

Selecting and validating dimethyl silicone fluid when changing suppliers

Matching viscosity is a useful starting point for screening alternatives, but it does not establish interchangeability. First compare test temperature, method and permitted tolerance, then examine volatility, cleanliness, contact materials and performance in the intended application. Adoption should depend on laboratory trials, production trials and finished-product validation.

Lubrication, mould release, damping and formulation-carrier applications have different acceptance priorities. Explaining what the fluid does in the equipment or formulation usually produces a more useful supplier response than simply asking for the same viscosity.

Compare viscosity under the same conditions

Identical numbers can refer to different temperatures, units or methods. Kinematic viscosity is commonly expressed in mm²/s or cSt; dynamic viscosity in mPa·s or cP. Conversion requires density at the same temperature. The numbers cannot simply be matched.

Before requesting quotations or samples, clarify:

1. Material type and principal composition, confirming that candidates serve the same functional role.

2. Viscosity test temperature, units, method, specification range and measured batch result.

3. Whether each figure is a typical value, a delivery limit or a result for a particular batch.

4. Application, operating temperature, dosage, contact materials and unacceptable failure modes.

Purchasing specifications should state acceptable ranges and acceptance methods rather than a nominal number alone. Typical values describe a product; they are not automatically a commitment for every delivered batch.

What to check beyond viscosity

Item	How to compare	Application relevance
Volatility and low molecular weight components	Confirm temperature, duration, method and customer-specified tests	Mass loss and contamination in hot, enclosed or clean environments
Appearance and cleanliness	Agree colour, clarity, particles, moisture or impurity tests as required	Similar appearance does not mean equal cleanliness
Flash point and safety information	Compare results from the same method and review the current SDS	Storage, transport and process risk; not proof of service-temperature suitability
Compatibility and surface residue	Test actual contact materials and downstream operations	Seal changes, migration, bonding and printing
Batch consistency	Review COAs, retained samples and consecutive batch records	Effects of supply variation on processing and finished products

Set priorities by application

Lubrication

Compare friction, wear and relubrication intervals using the actual friction pair, load, speed and temperature. Check seals and surrounding materials for compatibility. Similar feel at room temperature does not establish equal long-term lubrication performance.

Mould release

Keep mould, moulded material, application method and dosage constant. Assess release force, consecutive release cycles, mould deposits and product-surface residue. Include bonding, coating or printing in acceptance testing when these operations follow moulding.

Damping

Measure resistance, return behaviour or movement time across the intended temperature range. Check changes after temperature cycling and inspect seals. Room-temperature viscosity alone can miss cold-start or high-temperature damping changes.

Formulation carrier

Use the actual mixing order, temperature and dosage to assess dispersion, separation, oil bleed and storage stability. For coatings or adhesives, also examine surface defects and bonding; for electrical applications, add tests required for the finished product.

Validate from sample to production

1 Agree acceptance criteria

Retain current technical documents, batch records and normal production data for the existing material. Turn complaints and past anomalies into checks, such as residue, oil bleed, deposits or damping changes.

2 Run controlled laboratory trials

Keep the current fluid as a reference. Use the same equipment, dosage, mixing order and test conditions for candidates, without changing other variables simultaneously. If a formulation change is necessary, create a separate trial group and record why.

3 Trial under actual operating conditions

After laboratory requirements are met, confirm scale-up processing, actual contact materials and continuous operation. Set ageing duration, temperature range and cycle counts according to product life and risk; there is no universal passing number.

4 Document purchasing and change requirements

Record approved specifications, test methods, applicable processes and restrictions. Agree COAs, retained samples, batch traceability and change notification. Continue monitoring delivered batches after sample approval.

Judge results against acceptance criteria agreed in advance, not an impression that the materials look alike. Passing one test supports a conclusion only for that test and its conditions.

Information to prepare for a supplier enquiry

Provide a non-confidential application summary: purpose, target viscosity and test conditions, operating temperature, dosage, contact substrates, current problems, target market and expected order quantity. Specify methods and acceptance criteria for volatility, cleanliness or compliance requirements.

As a provider of solutions across the silicone value chain, IOTA can discuss candidate specifications within its dimethyl silicone fluid range against customer operating conditions. After initial selection, review the relevant technical data, safety information and batch inspection documents. Actual application validation determines suitability.

FAQ

Q1 Can we change suppliers directly if the stated viscosity matches

First check units, temperature, method and tolerance, then application-relevant properties. Nominal viscosity alone is insufficient without application validation.

Q2 Can cP and cSt be compared directly

No. cP measures dynamic viscosity and cSt kinematic viscosity. Conversion requires density at the same temperature.

Q3 Does a passing viscosity result on the COA guarantee performance

A COA reports batch results for the listed tests. It does not cover every application. Release, lubrication, damping and formulation stability require their own trials.

Q4 Can we switch all production immediately after a laboratory trial passes

Complete scale-up and finished-product validation according to risk. Establish traceability and change requirements before deciding the extent of the switch.

Q5 Must every impurity be tested for ordinary industrial use

The test list depends on application and risk. High-temperature, electronics and food-contact applications may differ. Establish finished-product requirements, then agree relevant testing and documents.

Q6 How can we start without complete data from the current supplier

Use retained samples from normal production and existing operating conditions to establish a baseline. Confirm material type, viscosity conditions and key properties with the supplier. Record gaps; do not treat assumptions as established specifications.