Primer/Priming

Initiale,/. initial Expl.) primer, Initial-explosivstoff, -sprengstoff, m. initiating or priming explosive, primer, priming. -zUnder, m. primer, -zun atz, m. priming... 

Section 200 (Methods 201 to 212). Specification of Multiple Component Primer Compositions Fuze Powder Primer Mix, (JS Standard Primer Mix, New No 4 Primer Mix, MK V Primer Mix, No 70 Primer Mix, PA100 Primer Mix, NOL No 130 Primer Mix, M3 Ignition Cartridge Primer Mix, M29 Percussion Primer Priming Composition, Lead Starter Type RDX Booster Pellets and Tetryl Booster Pellets... 

Wash primer Priming paint usually supplied as one- or two-component systems. The paint contains carefully balanced proportions of an inhibiting chromate pigment, phosphoric acid, and a synthetic resin binder mixed in an alcohol solvent. On clean, light alloy or ferrous surfaces, and on many non-ferrous surfaces, such paints give excellent adhesion, partly due to chemical... 

Primers—Prime with BR adhesive in an aliphatic solvent,or use silicone primers. 

When possible, gears should be run-in on initial startup. Speeds and loads should be inereased in pereentage inerements. Lube oil temperature, and pressure and bearing temperatures should be observed and adjustments made to the lube system as required. The number of adjustments made will depend on the eomplexity of the system. Oil pressure is of primary importanee. When an auxiliary pump has been provided, oil should be eireulated before the aetual start. If not, the pump should be primed, and the journals wetted with oil. Primer holes are sometimes provided or alternate journals ean be oiled through the holes provided for bearing temperature deteetors. 

Tsai et al. have also used RAIR to investigate reactions occurring between rubber compounds and plasma polymerized acetylene primers deposited onto steel substrates [12J. Because of the complexities involved in using actual rubber formulations, RAIR was used to examine primed steel substrates after reaction with a model rubber compound consisting of squalene (100 parts per hundred or phr), zinc oxide (10 phr), carbon black (10 phr), sulfur (5 phr), stearic acid (2 phr). 

If corona, plasma, or flame treatment is chosen as the surface treatment, it is important to bond quickly after the treatment. Waiting several hours will reduce the effectiveness of the treatment. In some cases, attempts to bond 24 h after the treatment can give the same poor bonding results as if the plastic had never been surface treated. If surface oxidation is not possible, priming the surface with a chlorinated polyethylene primer is a second choice [95]. 

Fig. 4, Cross-sectional electron micrographs of (a) primed PAA interphase and (b) unprimed PA oxide. showing complete penetration of primer into the oxide pores [9].

Prime Prime with appropriate primer. After the surface has cooled to 90°F (32 C), apply primer and cure with heat lamps. 

After drying, the anodized parts are primed with the adhesive primer. Time between anodize and priming is limited to prevent contamination of the active oxide layer. The primer is air-dried for a time to allow the solvents to evaporate and then baked at elevated temperature to cure. Many adhesive primers have very tight thickness requirements, for instance 0.00015" to 0.001", and require skilled spray operators to apply. A primer layer that is too thick can result in low peel strength while a layer that is too thin might not be continuous and could result in insufficient wetting of the surface by the adhesive during cure. 

Application of protective paints consists of surface preparation of steel, priming coat and finishing coats. Wherever possible, steel should be blast-cleaned before painting. Primers thoroughly wet the metal to promote adhesion of finishing paints and carry inhibitive pigments. For example, red lead oxide will minimize the spread of rust on metal surfaces. The total thickness of fmishing coats must be at least 0.125 mm for adequate protection and life. Four coats of paint usually are necessary to achieve this. 

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