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Check how the H suffix entered the record

Compare the fabrication drawing, bill of materials, purchase history and any label or technical sheet supplied with the original board. Determine whether H is part of the manufacturer's name, an internal code, a distributor notation or a transcription issue.

Keep the exact original text while investigating. A search result that repeats the same name may not add independent evidence. Ask the supplier for a document that explicitly names the product and its supplied form, with a revision applicable to the proposed order.

Resolve the material record before release

Keep the verified S1165 history in its own place

The S1165 datasheet guide explains the historical document trail and its limits. It should be read as context, not as a source of missing S1165H specifications. The same is true of another legacy halogen-free material such as S1155.

If a supplier says the names are related, request the exact relationship in writing. A continuation, a replacement and a different product are different decisions. Record which one applies and what evidence supports the proposed material.

Define the thermal requirement without guessing a grade

State the expected assembly exposures, board thickness, hole architecture, copper and reliability conditions. Identify any minimum property requirement with its test method. This creates a reviewable target while the product name remains unresolved.

Do not infer a higher Tg from the letter H. Even a verified Tg would not establish continuous-use temperature, reflow count or plated-hole life. If a high-Tg alternative such as the material discussed on the S1000-2 page is proposed, evaluate it against the entire construction.

Shengyi S1165H requirement register

Optional cost comparison from your own allowances

Use a quotation or a clearly labeled internal assumption for each input. Keep the quantity, construction and inspection scope the same when comparing alternatives. This uncalibrated planning model adds entered values; it contains no current market rates and does not issue a 吃瓜tv quotation. You can contact the team without completing it.

Keep chemical and electrical evidence independent

A halogen-free claim needs a product-specific declaration under the required criterion. Dk and Df need frequency, method and construction. A supplier statement about one of these topics does not close the others.

Create separate rows in the review record so that unresolved conditions remain visible. This is particularly useful when purchasing receives a quote before engineering receives a complete TDS. A commercially available alternative can still require technical approval.

Use the worksheet to organize the clarification

Record the original callout, requested source, supplier response, proposed construction and substitution authority. A recorded status needs a reference and a not-applicable status needs a reason. The tool checks those fields but does not judge the credibility or completeness of the underlying evidence.

Use nonconfidential labels and keep controlled files elsewhere. Download the summary only after recalculating the current inputs. Nothing is automatically sent to the Contact form, and the worksheet cannot approve a laminate for production.

Request a conditional proposal with clear exceptions

Send the original drawing excerpt, board files, quantity and requirements that cannot change. Ask whether the supplier can identify the exact material or proposes a different grade. Require any quotation to state the proposed identity and unresolved approval steps.

The allowance calculator uses your entered numbers and has no price or stock data for S1165H. Compare equivalent scopes only after assumptions are documented. The Shengyi material overview provides confirmed-family navigation while this suffix question remains open.

Resolve the original callout without losing the design requirement

A useful material callout connects the required function to a named document, a measurable condition and an approval owner. Keep the exact grade and supplied form with the thickness basis, copper treatment, test method and substitution rule. This prevents a purchasing shorthand from silently replacing a more precise engineering requirement.

Distinguish typical characterization from a guaranteed supply limit. A typical result may help compare options, but it is not automatically the acceptance value for an incoming lot. If a supplier proposes an alternative, compare the properties that affect this design and the manufacturing evidence needed to use it. Record the decision with a drawing or material-list revision instead of leaving it only in an email thread.

For an inquiry, provide the construction, required quantity, application conditions and any nonnegotiable specification references. Ask which requirements need additional evidence or lead time. A clear open question usually produces a more useful response than a broad request for the best laminate.

An unresolved name is a reason to investigate, not a reason to invent a plausible datasheet. Start with the oldest controlled record that actually belongs to the design. A material label, drawing revision or archived supplier sheet can establish a more useful trail than many websites repeating the same unsourced paragraph. Preserve the exact characters and supplied form while the question remains open.

Ask the supplier to distinguish four possible responses: exact product identified, historical product identified, internal code mapped to a product, or a different product proposed as an alternative. Each response leads to a different approval step. A commercial offer for a replacement does not prove the historical name was equivalent.

If a replacement is needed, define the board requirements independently of the old name. Compare electrical design inputs, thermal exposures, reinforcement, thicknesses, copper and manufacturing compatibility. Decide which previous qualification evidence remains applicable and which work must be repeated. Keep the approved decision with the current drawing while retaining the old callout in the change history.

Do not describe an unverified grade as discontinued merely because a public search did not find it. Equally, do not promise current stock because an old certificate exists. Identity, lifecycle, orderability and suitability are separate questions. The inquiry should identify which answer is needed and what evidence would resolve it.