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Separate historical identity from a current process sheet

The reviewed ITEQ corporate documentation includes IT-180GN BS. That record supports historical identity, not current inventory or a complete performance specification. It does not justify importing cure, flow or electrical values from another 180-series material.

Ask for the current technical and handling documents for the proposed supply. The IT-180I core and prepreg guide explains a different documented pairing. Shared family digits are not evidence that the materials can use the same press instruction.

Material facts and decision boundaries

Describe the bondline and surrounding features

Identify the surfaces to be bonded, copper heights, local clearances and any cavity or keep-out. The proposed bonding interval must fill the intended geometry while meeting electrical and mechanical requirements. An average copper percentage can hide a difficult local region.

Request the supplied form, glass style, resin content, lot and intended pressed thickness. If controlled flow is required, state the actual boundary and acceptance condition. Do not rely on the letters GN to establish that the product is no-flow.

Lot age and open-exposure worksheet

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.

Track time using the supplier's definitions

A usable-life clock needs a defined starting point, storage conditions and packaging state. Open exposure may require a separate record. Different products and environments can use different allowances, so the worksheet does not contain a built-in IT-180GN shelf life.

Enter only a documented allowance or label the scenario as hypothetical. If a package has been exposed several times, preserve the cumulative record where the supplier's instruction requires it. Repackaging or moving it to another storage area should not erase the prior history.

Interpret the time worksheet as arithmetic

The example uses an assumed 60-day age against 90 days and 3 hours of exposure against an 8-hour allowance. It reports 30 days and 5 hours remaining under those assumptions. These are not recommendations for IT-180GN and do not release a lot for use.

Temperature, humidity, packaging damage and previous processing remain outside the arithmetic. A material whose time allowance appears positive can still need disposition for another reason. Keep the responsible process decision separate from the calculated remainder.

Connect the handling record to the build sequence

For an HDI structure, the IT-168G2 opening review illustrates why local geometry and sequential processing need their own evidence. A valid storage record does not approve a via or bondline, and a successful coupon does not establish the history of every material lot.

If a source instead names IT-180H, resolve that identity before applying any IT-180GN instructions. The original callout, actual supply and approved process should agree before material is issued to the job.

Prepare a bonding-material inquiry with clear responsibilities

Send the exact designation, original source, proposed stackup, local geometry, quantity and expected assembly history. Ask for the relevant handling and processing documents, available constructions and any required qualification work.

Use the optional cost worksheet only with comparable quoted allowances. It contains no prepreg market rates or spoilage prediction. The useful response identifies the material, process responsibilities and unresolved conditions rather than promising performance from a historical name alone.

Review supplied form, local geometry and process together

A stackup is an agreement about physical construction, not just a vertical list of copper layers. Give each dielectric interval an identity and distinguish cured core thickness from the pressed thickness of bonding material. State whether copper is included in every quoted dimension.

Review the implications of a material change across impedance, lamination, drilling, registration and assembly exposure. A replacement with a similar headline Tg or Dk can still require a different geometry or process. Preserve the approved layer order, copper distribution assumptions and measurement basis with the manufacturing files.

Use the worksheet to organize a review, then obtain the fabricator's proposed construction and tolerances. Close differences before release. The final stackup, drawing and procurement material list should reference the same revision, especially when multiple suppliers or repeat orders are involved.

Bonding materials cannot be selected from a cured-laminate table alone. Establish whether the product is woven-glass prepreg, another reinforced bonding system or resin-coated copper. Each form has a different relationship between its supplied condition and the finished dielectric interval. Preserve the exact product and source revision in the proposed build.

Local copper distribution matters. Average coverage can conceal a large clearance region, a thick copper transition or a difficult target area. Supply the actual artwork and identify the locations that drive filling, registration or opening requirements. A single global thickness or aspect ratio does not characterize every local feature.

Process guidance should be applied by the responsible manufacturing team to the actual construction. A public document does not replace press-load qualification, handling controls or an approved drilling and metallization route. Do not use a generic bake or cure instruction for an unidentified bonding material.

Agree how the critical features will be verified. Representative cross-sections, dimensions and appropriate electrical or reliability evidence answer different questions. Keep the selected locations and acceptance requirements with the drawing so that a successful easy region is not mistaken for evidence about the most demanding feature.