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Hot Melt Temperature Margin Calculator
A thermoplastic hot melt has to sit inside a window: its activation temperature must stay below what your substrate takes, and its softening range must start above the temperature the finished part sees in use. Enter the four temperatures for your line and the grade you are looking at, and the calculator shows how much room is left on each side.
The calculator holds no temperature values of its own. Every number comes from your line, your product specification or the grade’s datasheet.
Enter Your Temperatures
Your line and your product
The highest temperature the textile, foam or film you bond takes in the bonding cycle without scorching, shrinking or crushing.
The highest temperature the finished part sees in use, for example a car interior in summer or a hot wash cycle.
The adhesive grade
The glue-line temperature at which the grade flows and wets, from its datasheet or your trial.
From the datasheet. Ask for the melting range measured by DSC for the exact grade.
Your safety margin
Your own rule for how close you allow either margin to get. Enter 0 to see only whether each margin is positive.
Your Margins
Enter all five values, then press the button.
Enter all five values as numbers. Temperatures must lie between -273 °C and 1000 °C, and the margin must be 0 or more.
Process margin
substrate limit minus activation temperature
substrate limit minus activation temperature
Service margin
softening point minus service temperature
softening point minus service temperature
Room in your window
substrate limit minus service temperature
substrate limit minus service temperature
The activation temperature you entered is below the start of the softening range. A hot melt flows only once it is heated into its softening range or above it, so check both values against the datasheet.
Send your window for a grade shortlistHow the Margins Are Worked Out
- Process margin = substrate temperature limit − activation temperature. At zero or below, the grade needs as much heat as the substrate takes or more, and the substrate scorches, shrinks or crushes.
- Service margin = start of the softening range − service temperature. At zero or below, the glue line reaches its softening range in use, and a thermoplastic glue line softens again above that range.
- Status: a margin at or below 0 °C is marked no margin; a positive margin smaller than the one you set is marked tight; the rest is marked ok.
- Bar: the four temperatures are placed on one scale from the lowest to the highest value you entered.
Results are rounded to 0.1 °C. The margins say nothing about dwell time or pressure; map those with the Rate–Heat Bonding Compass and the Bonding Conditions Checklist.
When No Grade Fits
If the service temperature sits too close to the substrate limit, no thermoplastic hot melt fits between them. A joint that works above the adhesive’s softening range for long periods can use a structural epoxy or a cross-linked, reactive PUR adhesive instead. When the window is narrow but open, we build application-specific formulations around the substrate pair.
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