In labor arbitration, court proceedings or normal business activities, the official seal of the unit represents the unit externally. If the respondent company seals its defense, the defense content represents the meaning of the company and is valid.

Moreover, according to the law, in labor dispute arbitration, the respondent shall submit a defense to the labor dispute arbitration committee within ten days after receiving a copy of the arbitration application. The failure of the respondent to submit the written defense shall not affect the arbitration proceedings. Therefore, whether the respondent's defense is valid or not does not affect the arbitration hearing.

Law on mediation and arbitration of labor disputes

Article 30 After accepting the application for arbitration, the labor dispute arbitration commission shall deliver a copy of the application for arbitration to the respondent within five days.

After receiving a copy of the arbitration application, the respondent shall submit a written reply to the labor dispute arbitration committee within ten days. After receiving the defense, the labor dispute arbitration commission shall deliver a copy of the defense to the applicant within five days. The failure of the respondent to submit the written defense shall not affect the arbitration proceedings.