If you are thinking of importing PVC products, be aware that they can contain material that is prohibited for sale in California or prohibited for sale without labeling. The law is called Prop 65. The list of materials is available here: https://oehha.ca.gov/proposition-65/proposition-65-list As a designer, you can’t really validate this in your garage, but inspection services can. Some services are Bureau Veritas, SGS, MTS or contact a testing laboratory. Even in Canada, most labs have a prop 65 testing protocol.