The phrase "are generally produced" is correct and usable in written English.
It can be used when discussing the typical or common way in which something is created or manufactured.
Example: "These types of goods are generally produced in large factories to meet high demand."
Alternatives: "are typically made" or "are usually created".
Second-generation biofuels are generally produced from the polysaccharides in the lignocellulosic plant biomass, mainly cellulose.
Elastomeric silicone foams are generally produced by the generation of hydrogen through reaction of Si-H groups with active hydrogen compounds, including water and alcohols, in a process catalyzed by platinum or tin complexes.
A former intelligence official who still deals with Iraq said such reports are generally produced in response to a specific request from the administration or agency leaders, or are generated by the station chief in cases of "a crisis or a major shift" in a situation.
Currently, more than 165 biotherapeutic agents are licensed for treatment of a wide variety of illnesses and generate over $99 billion in global sales., These proteins are generally produced by expressing the gene in mammalian cell lines, which can be cultured to high density in large bioreactors (Fig. 1).
Ignimbrites are generally produced by large eruptions that form calderas.
Square and rectangular hollow sections are generally produced either by hot-rolling or cold-forming.
Turpentine oil is generally produced in countries that have vast tracts of pine trees.
It is generally produced commercially as a by-product in the refining of copper and nickel ores.
It is generally produced commercially as a by-product in the refining of copper, and nickel ores.
In nuclear installations, tritiated water is generally produced in the process of detritiation of air circulating in the glove boxes.
Randomization was not feasible because small cohorts were generally produced and each group had to comprise enough wild type mice to foster the mutants.
