What are HPHCs? HPHCs are abbreviations for harmful and potentially harmful substances, namely Harmful and Potentially Harmful Constituents. These substances may exist in aerosol (vapor) or other forms and may be inhaled, ingested, or absorbed into the body, causing direct or indirect harm to electronic cigarette users or non users.


The HPHCs testing in the United States mainly involves the following substances:

Diisobutyl phthalate (DIBP) is used as a plasticizer for PVC, as a substitute for DBP, and as a plasticizer for cellulose resin, vinyl resin, nitrile rubber, and chloroprene rubber.

Phthalate (2-ethylhexyl ester) (DEHP), mainly used as a plasticizer for PVC, is used as an insulator in electronic and electrical equipment such as cables and wires.

Dibutyl phthalate (DBP) is mainly used in conjunction with other plasticizers in PVC components such as cables, sockets, pipes, shock absorbers, and in some non polymer applications such as paint, adhesives, sealants, and printing inks.

Butyl benzyl phthalate (BBP) is mainly used as a plasticizer in PVC flooring, and may exist in synthetic leather, textile coatings, PVC materials, printing inks, sealants, and adhesives in electronic and electrical equipment.

The above information is for reference only. It is recommended to consult relevant experts in the field of chemistry for assistance.