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| Name      of Subsidiary                                                                                                                         |   | State      or other Jurisdiction ofIncorporation      or Organization |
|-------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------------------------------------------------------------|
| Ceradyne      ESK, LLC                                                                                                                          |   | Delaware                                                              |
|                                                                                                                                            |   |                                                                  |
| •    ESK      Ceramics Geschäftsführungs GmbH                                                               |   | Germany                                                               |
|                                                                                                                                            |   |                                                                  |
| •    ESK      Ceramics GmbH and Co. KG                                                                                |   | Germany                                                               |
|                                                                                                                                            |   |                                                                  |
|        o      ESK Ceramics France      S.A.S.U.                                                              |   | France                                                                |
|                                                                                                                                            |   |                                                                  |
| Ceradyne      Canadian Holdings, Inc.                                                                                                           |   | Delaware                                                              |
|                                                                                                                                            |   |                                                                  |
| •    Ceradyne Canada      ULC                                                                                         |   | Alberta,      Canada                                                  |
|                                                                                                                                            |   |                                                                  |
| Ceradyne      Armor Systems, Inc                                                                                                                |   | Delaware                                                              |
|                                                                                                                                            |   |                                                                  |
| Minco,      Inc.                                                                                                                                |   | Tennessee                                                             |
|                                                                                                                                            |   |                                                                  |
| Ceradyne      Cayman Holdings, Inc.                                                                                                             |   | Cayman      Islands                                                   |
|                                                                                                                                            |   |                                                                  |
| •    Ceradyne Hong      Kong Co., Ltd.                                                                                |   | Hong      Kong                                                        |
|                                                                                                                                            |   |                                                                  |
|           o     Ceradyne      (Tianjin) Technical Ceramics Co., Ltd. |   | China                                                                 |
|                                                                                                                                            |   |                                                                  |
| Ceradyne      EPB, Inc.                                                                                                                         |   | Delaware                                                              |
|                                                                                                                                            |   |                                                                  |
| •    Boron      Products, LLC                                                                                         |   | Delaware                                                              |
|                                                                                                                                            |   |                                                                  |
| SemEquip,      Inc.                                                                                                                             |   | Delaware                                                              |

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