The main factor in this question is whether you use the suspension process or the extrusion process.
If you use the extrusion production process, the ratio of the foaming agent is not too strict. Usually, N70/iso30, N60/iso40, and N50/iso50 are all acceptable.
If you use the suspension production process, the foaming agent used is: generally positive N70/iso30 in summer; generally positive N30/iso70 or positive N40/iso60 in winter.
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