The department may require an applicant for registration to furnish a statement of the formula of the applicant’s antifreeze, unless the applicant can furnish other satisfactory evidence that the antifreeze is not adulterated or misbranded. The statement need not include inhibitor or other ingredients that total less than five percent by weight of the antifreeze. All statements of formula and other trade secrets furnished under this section are privileged and confidential and may not be made public or open to the inspection of any persons other than the department. No statement is subject to subpoena. Nor may a statement be exhibited or disclosed before any administrative or judicial tribunal by virtue of any order or subpoena of such tribunal without the consent of the applicant furnishing the statement to the department.