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How to Spec a Thermal or Insulation Part: What to Send H-O for an Accurate Quote
The fastest path to an accurate quote on a custom die-cut thermal or insulation part is to send the goal, the part geometry, and the operating conditions in one package, rather than only a material name. Name the job, conduct, spread, insulate, or electrically isolate at high temperature, give the gap and available pressure for an interface or the outline and thickness for insulation, state the temperature and any isolation, outgassing, or flame target, and attach a drawing.
This guide is the checklist of exactly what to include so a converter can recommend a material direction, hold the right tolerances, and quote without a round of clarifying questions.
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The application problem
H-O Products is a precision die-cut converter, made to order, so a quote starts from your part definition, not from a shelf. The common slowdown is an incomplete request: a material brand with no geometry, an outline with no operating temperature, or an interface part with no gap or clamp pressure. Each missing field is a question that has to be asked and answered before anyone can commit to a material and a price, and that is where days disappear.
A complete specification does three things at once. It lets the converter confirm or recommend the right material family, it sets the tolerances and converting process the part needs, and it surfaces any constraint, isolation, outgassing, flame, that would rule a material in or out. Send those up front and the quote can come back with a material direction and a path from prototype to production rather than a list of things you still need to provide.
Why a thermal or insulation spec is easy to get wrong
These parts are deceptively simple to under-specify because the deciding information is not always the obvious information. A few patterns recur:
- The material name is not the spec. A grade name without the gap, the pressure, and the temperature does not define an interface part, because the right form depends on the joint, not the catalog headline. The converter still needs the conditions to confirm the choice.
- Interfaces need two numbers people forget. A thermal interface material is defined by the gap it must fill and the clamp pressure available, since those govern the in-application thermal impedance per ASTM D5470. Leaving them out is the single most common omission on an interface RFQ.
- The controlling constraint hides behind conductivity. For insulation, the secondary requirement, vacuum outgassing per ASTM E595, a flame class per UL 94, or dielectric strength per IEC 60243, often decides the material more than the conductivity target does, yet it is the field most often left blank.
- The finished-assembly rating is not the converter’s to certify. Battery propagation safety and similar system-level ratings are validated by the pack or device maker; the converter supplies the material converted to the drawing. Specifying the part, not the system rating, keeps the request accurate.
What to send: the full checklist
Group your request into the goal, the conditions, the part, and the commercials. The more of these you can fill in, the closer the first quote will be to final.
| Field | What to provide | Why it matters |
|---|---|---|
| The goal | Conduct heat across a joint, spread a hot spot, insulate, or electrically isolate at high temperature, plus a battery fire-barrier note if relevant | The first fork between a conductor, a spreader, an insulator, and a barrier |
| Gap and tolerance (interface) | Nominal gap and its tolerance at the joint | Decides whether a film or a conformable pad fills the gap |
| Contact pressure (interface) | Available clamp force or pressure | Sets the in-application impedance per ASTM D5470 and protects fragile parts |
| Target conductivity or impedance | If known, the conductivity or thermal impedance goal | Lets the converter compare candidate grades on the right metric |
| Operating and peak temperature | Continuous and peak temperature the part sees | A hard gate on which grades are even eligible |
| Electrical isolation and voltage | Whether the joint or barrier must isolate, and the voltage | Rules conductive families in or out; sets the dielectric need per IEC 60243 |
| Outgassing, flame, cleanliness | Any ASTM E595 outgassing target, UL 94 flame class, or cleanliness requirement | Often the controlling constraint, especially for insulation |
| Outline and thickness | Device footprint or insulation outline, plus thickness | Defines the cut part and the converting process |
| Adhesive, liner, facing | Any pressure-sensitive adhesive, release liner, pull-tab, or facing | Determines lamination and placement on your line |
| Volumes | Prototype quantity and annual volume | Sets tooling and the prototype-to-production path |
| Drawing | A DXF, STEP, or PDF drawing | The fastest, least ambiguous way to define the part |
RFQ Spec-Readiness Checklist
Tick each item you can include in your request. Items marked core are the ones that unlock a real quote; helps items sharpen it.
Start with the four core items. When all four are ticked, your request is ready for a real quote; the optional items then sharpen the material recommendation and the tolerances.
Illustrative only; confirm against current material data and a drawing review. This checklist tallies which inputs you have in hand. It does not compute any material property or price; final material selection, tolerances, and lead time are confirmed by H-O against your drawing and the manufacturer’s current technical data sheet.
Recommended material families to name, if you already know the direction
You do not have to choose a material to get a quote, but if you already know the direction it helps to name the family. These are the families H-O Products converts for this application; grade-level properties live on the manufacturer’s current data sheet.
- Interfaces: conformable, isolating boron-nitride silicone gap pads and reinforced thermal-pad sheet for larger or uneven gaps; thin TIM pads and films and dielectric PROTECT-series TIM pads for flat, well-clamped joints.
- Spreaders: natural graphite, higher-conductivity synthetic graphite, and the broader graphite thermal management family for moving a hot spot along a surface.
- Insulation: aerogel insulation, sector building, industrial, and rail aerogel, cryogenic aerogel, polyimide foam, and aerospace polyimide foam.
- High-temperature barriers and fire barriers: mica barrier sheets, glass-fiber paper, and EV battery thermal fire barriers.
Design and converting considerations the quote will cover
Knowing what the converter can do helps you frame the request, because the converting capability is part of the answer.
- Cutting to print. Parts are die-cut on rotary or flatbed tooling, kiss-cut on a liner where placement benefits from a peelable layer, and laser- or waterjet-cut for thick blocks, complex profiles, or prototypes. Thickness and outline tolerances are set on your drawing and confirmed at quote.
- Lamination and stack-ups. Where a part needs more than one layer, for example a TIM plus a dielectric plus an adhesive and a liner, those are laminated into a single converted part. Capabilities such as lamination and die-cutting turn a stack into one piece your line places once.
- Slitting and kitting. Roll and sheet stock can be slit to width and parts can be kitted and sequenced so a multi-part build arrives in install order.
- Documentation. Material data sheets, certificates of conformance, and lot traceability are available on request, and first-article inspection can be provided. H-O works as an ISO 9001:2015 certified organization; it does not over-certify beyond that.
- Second-sourcing the raw stock. Because the value is in the converting, a family-level material direction lets you second-source the raw stock while the converter holds the part to the same drawing.
Common failure modes in the request itself
| Request mistake | What is missing | Consequence |
|---|---|---|
| Material name only | Gap, pressure, temperature, outline | The converter cannot confirm the choice or quote without a clarifying round |
| Interface part with no gap or pressure | The two numbers that set impedance per ASTM D5470 | The right form, pad or film, cannot be selected |
| Insulation with conductivity only | The controlling constraint: outgassing, flame, or dielectric | A material is chosen that fails the real requirement |
| Asking the converter to certify a system rating | Recognition that the pack or device maker owns the assembly rating | An over-claim the converter cannot make; scope confusion |
| No drawing | An unambiguous outline and thickness definition | Tolerances and process are guessed, then reworked |
How H-O Products helps
H-O Products is a precision die-cut converter, made to order, and the quote process is built around your part definition. Send the goal, the conditions, and a drawing, and we confirm or recommend a material family from the gap, pressure, temperature, and any isolation, outgassing, or flame constraint, point you to the ASTM D5470, ASTM C177, ASTM E595, UL 94, and IEC 60243 data to confirm on the manufacturer’s current technical data sheet, set the tolerances and converting process on the drawing, and lay out a path from prototype to production.
We convert maker sheet, blanket, and roll stock to your part; we do not produce the raw stock, do not stock finished parts, and do not dispense liquid or putty interface materials. We work as an ISO 9001:2015 certified organization in Winsted, CT, with material data sheets, certificates of conformance, lot traceability, and first-article inspection available on request.
Send the checklist, get a real quote
Put the goal, the gap and pressure or the outline and thickness, the temperature, any isolation, outgassing, or flame target, the adhesive and liner, the volumes, and a drawing into one request. We will recommend a material direction, flag the data to confirm on the data sheet, and quote a die-cut part with a prototype-to-production path. Samples typically ship in 3 to 5 business days for common configurations; standard production runs about two weeks.
Family-owned in Winsted, Connecticut since 1971 · ISO 9001:2015 certified · OEMs worldwide send us a drawing — and get back their part.
Frequently asked questions
What is the minimum information H-O needs to quote a thermal or insulation part?
For an interface part: the goal, the gap and tolerance, the available clamp pressure, the operating and peak temperature, whether it must electrically isolate, and an outline or drawing. For an insulation or barrier part: the goal, the controlling constraint such as outgassing, flame, or dielectric, the temperature, and the outline and thickness or a drawing. Those unlock a real quote; everything else sharpens it.
Do I have to pick the material before requesting a quote?
No. You can send the goal and the operating conditions and let H-O recommend a material family direction. If you already know the direction, naming the family helps, but the converter can reason from the gap, pressure, temperature, and constraints to a recommendation and point you to the data to confirm on the manufacturer’s current data sheet.
What drawing formats does H-O accept?
A DXF, STEP, or PDF drawing is the least ambiguous way to define the part outline and thickness, and any of those works. The drawing sets the cut geometry and the tolerances the converting process will hold, which are confirmed at quote.
Can H-O hold a specific thickness or outline tolerance?
Thickness and outline tolerances are set on the drawing and confirmed at quote, because they depend on the material and the part. H-O die-cuts to print on rotary and flatbed tooling, kiss-cuts on a liner, and laser- or waterjet-cuts thick blocks and complex profiles; the achievable tolerance is part of the quote response rather than a single published number.
Does H-O certify that the part meets a battery or device safety rating?
No. System-level ratings such as battery thermal-runaway propagation safety are validated by the pack or device maker. H-O is a precision die-cut converter that supplies the material converted to your drawing, with material data sheets, certificates of conformance, and lot traceability available, and works as an ISO 9001:2015 certified organization without over-certifying beyond that.
Request a quote for your thermal management & insulation part
Send H-O your drawing or describe the part—engineering reviews every RFQ and converts samples on your geometry.
Last updated · Reviewed by H-O Products engineering (ISO 9001:2015 certified converter, Winsted, CT).
References and standards
- ASTM D5470 – Standard Test Method for Thermal Transmission Properties of Thermally Conductive Electrical Insulation Materials (interface thermal impedance; the reason gap and contact pressure belong on an interface RFQ).
- ASTM C177 – Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus (insulation conductivity).
- ASTM E595 – Standard Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgassing in a Vacuum Environment (the outgassing target to state for vacuum and sealed-optics parts).
- UL 94 – Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances (the flame class to state for flame-controlled assemblies).
- IEC 60243 – Electric strength of insulating materials (the dielectric strength to state where a part must also isolate).
- Manufacturer technical data sheets for the relevant gap pad, TIM film, graphite spreader, aerogel, polyimide foam, mica, or glass-fiber paper grade, the source of grade-level properties. Confirm current grade designations and properties on the manufacturer’s current technical data sheet.
Related reading
OverviewThermal Management & InsulationRead → Sub-applicationHVAC Thermal Management & InsulationRead →
GuideChoosing a Thermal Interface Material: Gap Pads, TIM Films, and Graphite Spreaders by Impedance, Not Bulk ConductivityRead →
GuideAerogel, Polyimide Foam, or Mica: Selecting Insulation by Conductivity, Outgassing, Flame, and Dielectric StrengthRead →
This article cites general engineering principles and published test standards (ASTM D5470 for interface thermal impedance, ASTM C177 for insulation conductivity, ASTM E595 for vacuum outgassing, UL 94 for flammability, IEC 60243 for dielectric strength). Material names refer to thermal and insulation families H-O Products converts, identified by material type. Performance figures are grade dependent; confirm all values against the manufacturer’s current material data sheet and an engineering drawing review before specifying.
H-O Products is a precision die-cut converter, made to order, and does not produce raw material stock, stock finished parts, or dispense liquid, putty, or phase-change interface materials.