1A33 LOS

Urethane 1A33 LOS

HumiSeal® 1A33 LOS conformal coating is:

  • polyurethane conformal coating
  • chemically resistant
  • single component
  • suitable for general PCB applications
  • RoHS directive 2015/863/EU
  • China RoHS 2

Application of 1A33 LOS Conformal Coating HumiSeal® 1A33LOS is a development of HumiSeal® 1A33 with reduced odor levels and lower toxicity solvents. After complete cure, the properties of HumiSeal® 1A33 LOS and HumiSeal® 1A33 are comparable. Conformal coatings can be successfully applied to substrates that have been cleaned prior to coating and to substrates assembled with low residue, “no clean” assembly materials. Users should perform adequate testing to confirm compatibility between the conformal coating and their particular assembly, materials, process conditions and cleanliness levels. Please contact HumiSeal® for additional information. HumiSeal® 1A33LOS Pre-Blends are available, diluted to a specific viscosity for immediate use. No additional dilution is required. Customers should establish which Pre-Blend is suitable for their equipment and application method before commercial use. HumiSeal® Technical Support should be contacted if any further advice on Pre- Blends and equipment is required.

Dipping A controlled rate of immersion and withdrawal (5-15 cm/min) will further ensure even deposition of the coating and ultimately a uniform film. During the application, evaporation of solvent causes an increase in  viscosity  that should be adjusted by adding small amounts of Thinner. Viscosity in the dip tank should be checked regularly, using a simple measuring device such as a Zahn or Ford viscosity cup.

Spraying HumiSeal® 1A33LOS Pre-Blends are available which can be sprayed using conventional spraying equipment. Spraying should be done in an environment with adequate ventilation so that the vapour and mist are carried away from the operator. The specific pre-blend and spray pressure will depend on the specific type of spray equipment used and operator technique.

Brushing HumiSeal® 1A33LOS Pre-Blends are available which may be brushed onto surfaces. Uniformity of the film depends on specific pre-blend chosen and operator technique.

Storage HumiSeal® 1A33LOS and Pre-Blends should be stored away from excessive heat or cold, in tightly closed containers. HumiSeal® products may be stored at temperatures of 0 to 35°C. Prior to use, allow the product to equilibrate for 24 hours at a room temperature of 18 to 32°C.

Caution Application of HumiSeal® Conformal Coatings should be carried out in accordance with Local and National Health and Safety regulations. The solvents in HumiSeal® 1A33L O S and its Pre-Blends are flammable. The material should not be used in presence of open flame or sparks. Use only in well-ventilated areas to avoid inhalation of vapours or spray. Avoid contact with skin and eyes. Consult SDS prior to use.

Product Specification
Density, per ASTM D1475 0.92 ± 0.02 g/cm3
Solids Content, % by weight per Fed-Std-141, Meth. 4044 44 ± 2 %
Viscosity, per Fed-Std-141, Meth. 4287 195 ± 65 centipoise
VOC 512 grams/lire
Recommended Coating Thickness 25 – 75 microns
Drying Time to Handle per Fed-Std-141, Meth. 4061 30 minutes
Optional Curing Conditions to Reach Optimum Properties 30 days at RT30 hours @ 76°C 20 hours @ 88°C
Recommended Thinner (dipping, brushing) HumiSeal Thinner 905
Recommended Stripper HumiSeal Stripper 1063
Shelf Life at Room Temperature, DOM 24 months
Thermal Shock, 50 cycles per MIL-I-46058C -65° to 125°C
Coefficient of Thermal Expansion – TMA 193 ppm/°C
Glass Transition Temperature – DSC 26°C
Modulus – DMA 27.2 MPa
Flammability, per UL 94 Pending
Dielectric Withstand Voltage, per MIL-I-46058C >1500 volts
Insulation Resistance, per MIL-I-46058C 2.0 x 1014 ohms (200TΩ)
Moisture Insulation Resistance, per MIL-I-46058C 1.6 x 1010 ohms (16GΩ)
CTI, PLC per UL746A @ 600 volts 0
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