The term is explained in Srimad Bhagavatam.

Shuddha sattva is a technical term to explain the fact that paramatman has only good qualities without any defects.

Here are a beautiful verse from Bhagavatam explaining this

viśuddha-sattvaṁ tava dhāma śāntaṁ tapo-mayaṁ dhvasta-rajas-tamaskam māyā-mayo ’yaṁ guṇa-sampravāho na vidyate te grahaṇānubandham

Translation:

King Indra said: Your transcendental form, a manifestation of pure goodness, is undisturbed by change, shining with knowledge and devoid of passion and ignorance. In You does not exist the mighty flow of the modes of material nature, which is based on illusion and ignorance.

The term is explained in Srimad Bhagavatam.

Shuddha sattva is a technical term to explain the fact that paramatman has only good qualities without any defects.

Here is a beautiful verse from Bhagavatam explaining this

viśuddha-sattvaṁ tava dhāma śāntaṁ tapo-mayaṁ dhvasta-rajas-tamaskam māyā-mayo ’yaṁ guṇa-sampravāho na vidyate te grahaṇānubandham

Translation:

King Indra said: Your transcendental form, a manifestation of pure goodness, is undisturbed by change, shining with knowledge and devoid of passion and ignorance. In You does not exist the mighty flow of the modes of material nature, which is based on illusion and ignorance.