Exhibit 21.1

Lydall, Inc. Subsidiary List as of December 31, 2018

I.             Parent Company

Lydall, Inc.

II.           First tier

Lydall Thermal/Acoustical, Inc.

Lydall Performance Materials, Inc.

Lydall International, Inc.

LDL C.V.

Southern Felt Company, Inc.

Lydall North America, LLC

Susquehanna Capital Acquisition Co.

III.          Second tier

Lydall Netherlands B.V.

Texel Technical Materials Inc.

Lydall Performance Materials (US), Inc.

Lydall Sealing Solutions, Inc.

Interface Sealing Solutions Hong Kong LTD

IV.          Third tier

Afitex Texel Geosynthetics Inc.

Lydall Thermal/Acoustical (Taicang) Company Limited

Lydall Performance Materials B.V.

Lydall France S.A.S.

Lydall Holdings GmbH

Lydall UK Ltd.

Lydall Gerhardi GmbH & Co. KG

Texel Geosol Inc.

Interface Sealing Solutions, Europe SARL

Lydall Performance Materials Altenkirchen GmbH

Interface Performance Materials India, LLP

Interface Sealing Solutions (Shanghai) Co., LTD

V.Fourth tier

Lydall Performance Materials S.A.S.

Lydall Thermique/Acoustique S.A.S.

Lydall Industrial Filtration (EMEA) Limited

Lydall Industrial Filtration Textile Manufacturing (EMEA) Limited

Andrew Industries (Hong Kong) Limited

Lydall Gutsche GmbH & Co. KG

VI.Fifth tier

Lydall Industrial Textile Manufacturing Company (Shanghai) Limited

Lydall Industrial Textile Manufacturing Company (Wuxi) Limited

Lydall Industrial Textile Trading Company (Shanghai) Limited

Gutsche Holding GmbH

VII.Sixth tier

Leaseford Enterprises Limited

VIII.Seventh tier

Gutsche Environmental Technology (Yixing) Co. Ltd.