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Exhibit 21

SUBSIDIARIES OF REGISTRANT

The Company's principal affiliates as of December

31, 2020, are listed below. All other affiliates, if considered in the aggregate as a

single affiliate, would not constitute a significant subsidiary.

Percentage of voting

securities directly or

indirectly owned by

registrant

State or Country of

incorporation or

organization

Core Composites Corporation

100

Delaware

Horizon Plastics International Inc.

100

Canada