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Halogen heats a sheet about three times faster than ceramic at the same distance, and it dies three times sooner. Sizing a heater set is a trade between watt density, distance and the maintenance bill.
An aluminium frame runs at a U-value of 5.6. A multi-chamber PVC profile runs at 1.3, and a glass-fibre polyamide profile at 1.5 with a quarter of the thermal expansion. The argument is thermal, not mechanical.
A sink mark is a shrinkage problem that happens after the gate has frozen. Below a rib-to-wall ratio of 0.5 it is invisible; at 1.0 it is 62 microns deep, and no packing pressure will reach it.
A gel is a silicone network so lightly crosslinked that it still behaves like a liquid. Penetration runs from 350 to 60 as the crosslink density rises, and the tensile strength never reaches one megapascal.
A sterile barrier is only as good as the seal around it. Peel strength runs from 2 to 13 N per 15 mm across a forty degree window, and outside that window the package either leaks or will not open.
An ink stripe crosses the visible-change threshold at about 750 hours of accelerated UV. A coextruded stripe is still under it at 5,000. The difference is whether the colour is a layer or a coating.
Going from 300 to 600 kN of clamp force removes about two microns of flash. The floor is set by the tool, and clamp force is the fourth most common cause of flash, not the first.
Closed cell and open cell silicone sponge are not two grades of the same thing. At the same density the closed cell material takes two and a half times the force to compress, and it sets less.
A conductive sheet is a percolation network held in place by polymer. Stretching it pulls the network apart, and past a draw ratio of about 0.8 the tray stops being dissipative at all.
A wall tolerance is written in millimetres because the sources of variation do not scale with wall thickness. Reading it as a percentage is the most common mistake in a pipe purchase specification.
A third of short shots are pressure or shot size, a quarter are cold melt, and the rest are a short list of restrictions. The diagnosis is a sequence, not a list of things to try.
Resistivity falls ten orders of magnitude between 10 and 20 parts of carbon black. Everything else falls with it: compression set goes from 12 percent to 33, and the material stops behaving like rubber.
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