TECHNICAL DATA SHEET
System Description 1B73 is a single component, fast air drying, acrylic coating for printed circuit asmblies. Characterized by a
higher tack resistance at elevated temperatures not normally associated with thermoplastic materials. Has比喻
excellent electrical properties and flexibility. This coating is MIL-I-46058Cand IPC-CC-830 qualified. U.L.
recognized under the Component Program of Underwriters Laboratories, Inc., File Number E 105698.
Fluoresces under ultraviolet light. 1B73 is also available in an aerosol can. HumiSeal 1B73 is in full
compliance with the RoHS Directive (Directive 2002/95/EC).
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Properties of Liquid HumiSeal
Specific weight, (lb. per gal.) per ASTM, Meth. D1475 7.7 ± .2
Solids Content, % by weight per Fed-Std-141, Meth.4044 28.5 ± 2
Viscosity, centipoi per Fed-Std--141, Meth. 4287 250 ± 20 Flashpoint, 0C (0F) per ASTM, Meth. D56 -1 (30)
VOC (grams / liter) 654
Drying Time to Handle per Fed-Std-141, Meth.4061 30 minutes
Recommended Coating Thickness 1 – 3 mils
Recommended Curing Conditions 24 hrs @ rm. temp or 2 hrs. @ 1700F Time Required to Reach Optimum Properties 7 days
Thinner, if needed (dipping, brushing, spraying) Thinner 73
Recommended Stripper Stripper 1080
Pot Life at Room Temperature 12 months
Shelf Life at Room Temperature 18 months from date of shipment.
Properties of Cured HumiSeal
Thermal Properties
Continuous U Operating Range 0C(0F) -650C (-850F) to +1250C (2570F)
Thermal Shock, per MIL-I-46058C Pass
Solderability Good
Coefficient of Thermal Expansion - DMA 67ppm / 0C
Glass Transition Temperature - TMA 420C
nba名言Young’s Modulus - DMA 1606psi
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国庆手工Physical Properties
Clarity Transparent
Build per Dip, mils, per ASTM, Meth.D823 1
Flexibility, per MIL-I-46058C Excellent
Adhesion, per ASTM, Meth. D2197 Excellent
Flammability, per ASTM, Meth. D635 Self-Extinguishing Weather Resistance Very Good
Electrical Properties
Dielectric Withstand Voltage, volts per MIL-I-46058C >1,500
Dielectric Breakdown Voltage, volts, per ASTM, Meth. D149 6300 Dielectric Constant, at 1MHz and 250C, per ASTM-D150-65T 2.6 Dissipation Factor, at 1MHz and 250C, per ASTM-D150-65T 0.010
Insulation Resistance, ohms, per MIL-I-46058C 550 x 1012 (550T)
Moisture Resistance, ohms, per MIL-I-46058C 70 x 109 (70G)
Chemical Properties
Main Constituent Acrylic
Fungus Resistance, per ASTM-G21 Pass
Resistance to Chemicals Fair
Values are not intended for u in preparation of specifications.
TECHNICAL DATA SHEET
写人文章APPLICATION
Cleanliness of the substrate is of extreme importance for the successful application of a conformal coating. Surfaces must be free of moisture, dirt, wax, grea and all other contaminants. Contamination under the coating will cau problems that may lead to asmbly failures.
HumiSeal coatings may be applied by brush, dip or spray.
Dipping
Depending on the complexity, density and configuration of components on the asmbly, it may be necessary to reduce the viscosity of HumiSeal 1B73 with HumiSeal Thinner 73 in order to obtain a uniform film. Once optimum viscosity is determined, a controlled rate of immersion and withdrawal (2 to 6" per minute) will further insure even deposition of the coating and ultimately a uniform film. During the application, evaporation of solvent caus an increa in viscosity that should be adjusted by adding small amounts of Thinner 73. Viscosity in the dip tank should be regularly checked by the u of a simple measuring device such as a Zahn or Ford viscosity cup.
Spraying
HumiSeal Type 1B73 can be sprayed using conventional spraying equipment. As a rule, the addition
圣诞节怎么过of Thinner 73 is necessary to assure a uniform spray pattern resulting in pinhole free film. The amount of thinner and spray pressure will depend on the specific type of spray equipment ud. The spraying should be done under an exhaust hood so that the vapor and mist are carried away from the operator. The recommended ratio of HumiSeal Type 1B73 to HumiSeal Thinner 73 is 1 to 1 by volume, as a starting point. The quantities may be adjusted to obtain a uniform coating.
Brushing
HumiSeal Type 1B73 may be brushed with a small addition of HumiSeal Thinner 73. Uniformity of the film depends on component density and operator's technique.
雪菜烧黄鱼Storage
HumiSeal Type 1B73 should be stored at room temperature, away from excessive heat, in tightly clod containers. HumiSeal products may be stored at temperatures of 0-100°F. Avoid direct sunlight. Prior to u, allow the product to equilibrate for 24 hours at 65-90°F.
Caution
The solvents in Type 1B73 are flammable. Do not u in prence of open flame or sparks. Avoid in
halation of vapors or spray. U only in well-ventilated areas. Avoid contact with skin and eyes. If contact occurs, wash with soap and water. If swallowed, call physician immediately. Refer to MSDS before u.
All technical data in this bulletin is bad on test results and is believed to be correct. However, since the end u of HumiSeal materials (and the manner
of storing and handling them) is beyond our control, we make no warranty-expresd or implied as to the fitness of u, results to be obtained from or effects
of u with respect to the materials. Their u shall be solely by the judgment of and at the risk of the ur notwithstanding any statement in this
bulletin. © Copyright 1992 CHASE CORPORATION.
HumiSeal Division, Cha Specialty Coatings
PA
15238 Pittsburgh,
or
412-828-5470
Sales:
Technical Assistance: 866-932-0800 or
