Quoting%20commentary for Kelim 3:7

מֵחַם שֶׁטְּפָלוֹ בְחֹמֶר וּבְחַרְסִית, הַנּוֹגֵעַ בַּחֹמֶר, טָמֵא. וּבַחַרְסִית, טָהוֹר. קוּמְקוּם שֶׁנִּקַּב וַעֲשָׂאוֹ בְזֶפֶת, רַבִּי יוֹסֵי מְטַהֵר, שֶׁאֵינוֹ יָכוֹל לְקַבֵּל אֶת הַחַמִּין כְּצוֹנֵן. וְכֵן הָיָה אוֹמֵר בִּכְלֵי זֶפֶת. כְּלֵי נְחֹשֶׁת שֶׁזְּפָתָן, טְהוֹרִין. וְאִם לְיַיִן, טְמֵאִין:

If a vessel for heating water is plastered with potter's clay or kaolin, whatever touches the clay is subject to impurity, but whatever touches the kaolin is not subject to impurity. A kettle that was perforated and repaired with pitch, Rabbi Yose [declares it] pure because it is not able to hold hot water as [it can hold] cold [water]. And so he says with regard to vessels of pitch. Vessels of copper plastered with pitch, they are pure. But if [they are] for wine, they are subject to impurity.

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