Image of Crisco Butter Spray for representational purpose only. Link to original image is https://www.pamcookingspray.com/sites/g/files/qyyrlu196/files/styles/product_pack_shot/public/images/products/original-04881.png?itok=_iQGvz_f

Cooking spray is primarily used to prevent food from sticking. Cooking Spray containing non-flammable non-toxic or flammable gas as propellent is classified as dangerous goods.

IMDG Code defines Aerosols as

Aerosols or aerosol dispensers means an article consisting of non-refillable receptacles meeting the provisions of 6.2.4, made of metal, glass or plastics and containing a gas compressed, liquefied or dissolved under pressure, with or without a liquid, paste or powder, and fitted with a release device allowing the contents to be ejected as solid or liquid particles in suspension in a gas, as a foam, paste or powder or in a liquid state or in a gaseous state.

IMDG Code Chapter 1.1 Definitions

Watch preparing Potato, Sausage & Egg Breakfast Casserole Recipe with PAM Cooking Spray

Cooking spray will never have toxic gases (Class 2.3) as propellant and will never have toxic (Class 6.1) or corrosive (Class 8) substances as contents. Most cooking sprays are classified as UN 1950 Class 2.1 or 2.2.
Classification of Aerosols is laid down in special provision 63 in chapter 3.3 of IMDG Code.

The division of class 2 and the subsidiary risks depend on the nature of the contents of the aerosol dispenser. The following provisions shall apply:            

1. Class 2.1 applies if the contents include 85% by mass or more flammable components and the chemical heat of combustion is 30 kJ/g or more;
2. Class 2.2 applies if the contents contain 1% by mass or less flammable components and the heat of combustion is less than 20 kJ/g.
3. Otherwise the product shall be classified as tested by the tests described in the Manual of Tests and Criteria, part III, section 31. Extremely flammable and flammable aerosols shall be classified in class 2.1; non-flammable in class 2.2;
4. Gases of class 2.3 shall not be used as a propellant in an aerosol dispenser;
5. Where the contents other than the propellant of aerosol dispensers to be ejected are classified as class 6.1 packing groups II or III or class 8 packing groups II or III, the aerosol shall have a subsidiary risk of class 6.1 or class 8;
6. Aerosols with contents meeting the criteria for packing group I for toxicity or corrosivity shall be prohibited from transport;
7. Except for consignments transported in limited quantities (see chapter 3.4), packages containing aerosols shall bear labels for the primary risk and for the subsidiary risk(s), if any.

This designation does not cover pyrophoric, self-heating or water-reactive substances. The chemical heat of combustion shall be determined by one of the following methods: ASTM D 240, ISO/FDIS 13943:1999 (E/F) 86.1 to 86.3 or NFPA 30B.