Copywriting Samples:
Booklets (aka long-format copy)
Business-to-business copywriting
by William C. Blake
Long copy for industrial products can come in several forms: B2B primers, white papers, "how-to" guides, and so on. Long copy can be a particularly powerful way to build trust with a business-to-business or technical prospect, as long as the text is useful and not overtly biased.
Long copy establishes the client as an authority on the topic, while giving contextual comfort to technical-industrial decision-makers. It's also probably the best way to build website traffic and begin the sales conversion process.