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DEF STAN 00-35 was found in Box (file ID 961940542243) with the filename indicating it covers the Drip Proofness test. However, the PDF appears to be a scanned image with minimal OCR text extraction (only 23 characters retrieved, consisting of page numbers).
DEF STAN 00-35 is the UK Defence Standard for Environmental Handbook for Defence Materiel. Method CL28 relates to drip proofness testing, which evaluates the ability of equipment to resist the ingress of water from dripping or light rain conditions.
A manual review of the PDF or use of OCR software would be needed to extract the full method details.