Humiseal 1C48 is a fast-curing, environmentally friendly silicone conformal coating that is 100% solids and VOC-free, designed for various industrial applications. It features low viscosity, very good adhesion to PCB materials, and a quick dry time, making it suitable for high volume throughput in sectors like automotive and green energy. The product is easy to apply with standard equipment and has a shelf life of 12 months under proper storage conditions.

1. HumiSeal 1C48
Silicone Conformal Coating
100% Solids, Fast RTV Cure
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Agenda
• Introduction
• Product Technical Information
• Commercial Offer

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1C48 Main Highlights
• Single component, low viscosity
• VOC Free, 100% solids
• Super fast dry time
• Designed to reduce wrinkling commonly observed in RTV silicones
• Very good adhesion
• Typical applications: Industrial, Automotive, Green Energy, White Goods
• For example: Power supply, inverter, under hood applications
• Capability: Medium to high volume throughput and high device operating
temperature

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Technical Information
Density, per ASTM D1475 1.01 ± 0.03 g/cm³
Viscosity, per Fed-Std-141, Meth. 4287 270 ± 50 centipoise
Min. Solids Content, % by weight per Fed-Std-141, Meth. 4044 100 %
VOC 0 grams/liter
Recommended Coating Thickness 50 - 200 microns
Shelf Life at Room Temperature, DOM 12 months
• 1C48 is a low viscosity conformal coating, ideal for applications requiring tight
cost controls and thickness requirements
• With 100% solids and no VOC’s the 1C48 is an environmentally friendly
conformal coating
• Under normal storage conditions 1C48 has a 12 month shelf life

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Application
• HumiSeal® 1C48 can be sprayed using conventional
spraying equipment
• Spray pressure will depend on the specific type of
spraying equipment and operator technique
• Spraying should be done in an environment with adequate
ventilation
• At higher application thicknesses care should be taken if cure is
accelerated through heat to avoid wrinkling
• Dip application not recommended with 1C48 due to
moisture cure and solvent-less nature reducing pot life.
However, 1C48 is suitable for use in smaller and fast dip
operations
1C48 edge definition and coverage example

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Cure Properties
Drying Time to Handle per Fed-Std-141, Meth. 4061 5 min (100 µm, 50% RH at 21 ºC)
8 min (200 µm, 50% R.H. at 21 ºC)
4 min (200 µm, 8% R.H. at 60 ºC)
1.5 min (100 µm, 8% R.H. at 60 ºC)
Recommended Curing Conditions 24 hrs. @ RT (> 40% R.H.)
• Variables affecting cure cycle
• Thickness
• Cure temperature
• Humidity
• 1C48 is a high solids, solvent-less RTV cure silicone conformal coating. The
coating will begin to cure immediately following application as it encounters
ambient moisture
• Recommended RH 30-60% to avoid slow or too fast of a cure
• Depending on thickness and ambient conditions, 1C48 will be tack free within
minutes of application

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Physical Properties
Hardness, per ASTM D-2240-95 25 Shore A
Adhesion Very good on variety of PCB materials
Color Clear/Transparent
Dielectric Strength per ASTM D149 18.5 KV/mm
Volume Resistivity per ASTM D-257 3.44 x 1014 ohms.cm (344TΩ.cm)
Surface Resistivity, per ASTM D-257 3.0 x 1014 ohms per sq.(300TΩ/sq.)
Insulation Resistance, per MIL-I-46058C 5.0 x 1013 ohms (50TΩ)
Moisture Insulation Resistance, per MIL-I-46058C 45.2 x 1010 ohms (452GΩ)
• 1C48 has a smooth clear finish with a hardness of 25 Shore A
• Adhesion for majority of PCB materials is very good and will develop over
48 hours after application
• Adhesion is also affected by cleanliness of substrate, flux residues and surface type
• Recommend a minimum surface energy of 38 dynes/cm prior to application for
optimum adhesion
• 1C48 conformal coating surpasses all minimum required values per
required ASTM and MIL-I testing

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Repair / Rework
• HumiSeal Stripper 1091 is recommended for any intended removal of
significant coating surface area
• Immerse the component or printed circuit board assembly into HumiSeal® Stripper
1091
• The rate at which the existing coating will dissolve will depend upon its thickness and
age. Heating HumiSeal® Stripper 1091 will increase its effectiveness significantly
• Some silicone coatings may take as long as 8 hours to dissolve
• Clean up with IPA

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Packaging
• 1C48 are standard materials available in:
• 200L drum
• 20L pail
• 17L Bladder Bag
• 5L (4x5L case)
• 1L (6x1 case)

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Summary
Environmentally friendly, fast curing, cost effective silicone conformal coating
Features Benefits
100% Solids, VOC free Environmentally friendly, easy EH&S approval
Low Viscosity Low thickness control for cost effective application
Fast tack free time High volume throughput capability
Various application methods User friendly coating with edge definition control
and superb wetting
Multi industry usage Capable of device protection in automotive, white
goods, industrial, green energy and others
Good electric and
thermomechanical properties
High level of corrosion protection. Good thermal
shock performance with high SIR values

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HumiSeal North American Sales
Chase Global Operations Center
295 University Ave, Westwood, MA 02090
Tel: +1 781-332-0772
Toll Free (US only): 800-323-4182
Fax: +1 781-332-0702
sales@humiseal.com
HumiSeal Technical Support
Chase Global Operations Center
295 University Ave, Westwood, MA 02090
Tel: +1 781-332-0734
Fax: +1 781-332-0703
techsupport@humiseal.com
HumiSeal Europe
505 Eskdale Road, Winnersh, Berkshire RG41 5TU, UK
Tel: +44 (0)1189 442333
Fax: +44 (0)1189 335799
europeansales@chasecorp.com
europetechsupport@chasecorp.com
HumiSeal S.A.R.L
4/6 Avenue Eiffel, 78420 Carrieres-Sur-Seine, France
Tel: +33 (0) 1 30 09 86 86
Fax: +33 (0) 1 30 09 86 87
HumiSeal Asian Support
Tel: 852-9451-6434
Fax: 852-2413-6289
asiatechsupport@humiseal.com
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