SECTION 4 PACKAGING, PACKING, SKIDDING, AND SHROUDING 4-01. PACKAGING, After reassembly and external preservation, acces- sories not attached to the production equipment shall be wrapped and sealed in greaseproof barrier-material conforming to grade A and/or grade C of Specification JAN-B-121, 4-02. Gages and measuring instruments. Gages and instruments incorp- crating intricate and delicate assemblies such as comparators, projectors, electro-limit gages, tool makers microscopes, etc., shall be wrapped with grade A greaseproof material and then over-wrapped amd sealed in grade C greaseproof barrier material conforming to Specification JANB-121. When the grade C barrier material used has a wax~free interior surface, the grade A wrapping shall be omitted. At the discretion of the responsible personnel, and to accomplish additional protection, the packs may then be dipped in dip-coating sealing compound conforming to Specification JAN~P-115, All other gages and instruments shall be pack- aged as specified herein, or after thorough cleaning shall be dipped in compound conforming to Specification JAN-C-149. 4-03, Dies, jigs, amd fixtures removed from items of equipment shall be wrapped when necessary for mechanical protection, or for protection of critical surfaces fram hygroscopic blocking and dunnage. material specified in 4-01 shall be used. Wrapping Dies, jigs, fixtures, and accessories not attached to items shall be properly identified to the parent iten. 4-04. PACKING. Dies, jigs, fixtures, accessories, and delicate equipment not attached to items of equipment and weighing less than 500 pounds shall be packed in crates conforming to Specification JAN-P-132, or in boxes conforming to styles 2, 24, 4 amd 5, for type 3 load of Specification JAN-P-106. Tops shall be attached with screws instead of nails. Strapping of boxes is not required. Only parts pertaining to the same item shall be packed together. 4-05. Equipment and parts packed in boxes shall be adequately blocked and braced. When blocking or bracing will contact preserved finished surfaces, grade C material conforming to Specification JAN-B-121 shall be placed between the blocking and preserved surfaces. 4-06, At the discretion of the responsible personnel, boxes shall be lined with waterproof case-liners or bags conforming to Specification JAN-P-125. All seams except top opening shall be sealed with waterproof adhesives conforming to Specification JAN-P-140. Top overlap shall be folded at least twice to prevent entrance of water, but the top closure shall not be sealed, 4-07, SKIDDING, Where it is necessary to skid or reskid items of equipment for extended storage, the amount of skidding to be accomplished 18-37