Guides
Guides for buying alumina tubes and insulators
Sizes, grades and tolerances, with the standards behind them and the figures from our own orders.
Thermocouple protection tube sizes: the European series and what we stock
The OD × ID sizes European thermocouple makers order, the standard lengths, and which of them we keep in stock.
Read the guideC 799, C 610 and C 530: what the ceramic tube grades mean
What the class numbers on a drawing mean, which one suits which thermocouple and atmosphere, and the old KER 710 and KER 610 names.
Read the guideAlumina tube tolerances: what buyers write on orders, and what DIN 40680 allows
The OD, ID and length tolerances on this year's orders for protection tubes and insulators, set against the DIN 40680 general tolerances.
Read the guide
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Tell us the dimensions, grade and quantity. A contractual datasheet with current, product-specific test data and tolerances comes with each quotation.