What if the factory doesn't buy social security?

Legal analysis: you can ask for it. The law stipulates that companies must buy social insurance for their employees.

As for the social security contract you signed, if the company is exempted from legal liability, even if it is signed, it can be considered as an invalid clause.

Legal basis: People's Republic of China (PRC) Labor Contract Law.

Article 8 When employing workers, the employing unit shall truthfully inform the workers of their work contents, working conditions, workplace, occupational hazards, conditions for safe production, labor remuneration and other information required by the workers;

Article 26 The following labor contracts are invalid or partially invalid:

(1) Causing the other party to conclude or change a labor contract against its true meaning by means of fraud, coercion or taking advantage of the danger of others;

(2) The employer exempts itself from legal liability and excludes the rights of workers;

(3) Violating the mandatory provisions of laws and administrative regulations.

Any dispute over the invalidity or partial invalidity of a labor contract shall be confirmed by the labor dispute arbitration institution or the people's court.

Article 27 If part of a labor contract is invalid and does not affect the validity of other parts, the other parts are still valid.