Can a tuberculin syringe be interchanged with an insulin syringe to give insulin?

They are made for administration of specific measurements of either insulin or the antigen for TB testing called PPD (Purified Protein Derivative). Both types of syringes are calibrated into "units"....

ISO 8537:2007 specifies requirements and test methods for sterile syringes, with or without needles, solely for the injection of insulin. The syringes are single-use only, primarily for use in...

ISMP and the Pennsylvania Patient Safety and Reporting System have received several reports describing errors in which tuberculin syringes were used in place of insulin syringes (Figure 4). Examples...

it dose because it is not sterial any more

Do not use a TB syringe for your insulin. The standard these days is for insulin to be 100 units per mL, which would seem to measure the same, but the syringes are calibrated differently and they are...