Chiltern Connections

Chiltern Connections lighting the way

Materials such as, thermal compounds, silicones, conformal coatings and encapsulation resins and potting materials have become widely used in the manufacturing of LEDs by design engineers. The reason for this is to improve LED performance, product life and to provide protection from environments.

The Main Applications


  • Automotive lighting
  • Airport lighting
  • Aviation lighting
  • Domestic lighting
  • LCD screen backlights
  • Machine lighting
  • Rail signal lighting
  • Road signal lighting
  • Sport advertising signage
  • Stage & theatre lighting
  • Street lighting

See the tables below for recommended products supplied by Chiltern Connections that are aimed at providing LED systems engineers, designers and manufacturers with the right products and solutions for all their LED encapsulant, potting and environmental requirements. These requirements include moisture ingress, thermal stability and thermal shock, together with the ability to withstand a wide range of virbration frequencies and vibration shock.


LED Encapsulants, Coating and Potting Material Products
Grade Number
QSil218 QSil12 SC3001 UR5634 UR5635 AFA
Colour Clear Hazy
Clear Clear Pearl Clear
Material Type
2 Part Silicone
2 Part Silicone 2 Part Silicone 2 Part Urethane
2 Part Urethane 1 Part Acrylic
Application and Benefits
Water clear potting
Self bonding diffuse potting
Inibition resistance to cables & gromets
Flexible and tough crystal clear, low colour shift
Flexible and tough diffuses light output
Conformal coating, low colour shift, no aromatics
Density 1.01 0.99 1.04 1.11 1.12 0.92
Mixed Viscosity (cp)
3000 1100 1080 1050 1050 285
Mix Ratio by volume
10:1 20:1 12:1 1:1 1:1 none
Pot Life (mins)
360 120 30 15 15 N/A
Fixture Time (mins)
TBA TBA 120 20 20 4
Full Cure (hrs)
24-48 24 24 24 24 24
Shore Hardness
59A 19A 20A 80A 80A N/A
Thermal Conductivity (W/m.k)
0.18 0.18 0.18 0.2 0.2 0.2
Operating Temperature (°C) - 60 to + 200
- 55 to + 220
- 60 to + 200
- 40 to + 120
- 40 to + 120
- 65 to + 125
Approvals meets UL94HB
UL94V0

Thermal Compounds and Greases
Grade Number G747 G776 G777 G779 X-23-7868-2D X-23-7921-5 G1000 HTCX
Colour White White White White Grey Grey White White
Material Type Silicone
Grease
Silicone
Grease
Silicone
Grease
Silicone
Grease
Silicone
Grease
Silicone
Grease
Semi Cure
Silicone
Grease
Non Silicone
Grease
Application
and
Benefits
General
Purpose
Contains
solvent
to ease
processing
and interface
General
Purpose
Heat ageing
properties
enhanced
High TC
contains solvent
to ease
processing
and interface
High TC low
resistance
Cures to form
skin reducing
migration
No silicone
content,
improved
bleed
Density 2.65 2.9 3.4 3.21 2.5 2.8 3.04 2.61
Viscosity
(cp)
50 58 178 160 100 363 80 141
Penetration 328 359 190 190 300
Thermal Resistance
(mm?2.K/W)
38 @ 35
micron
7.4 @ 7.8
micron
21 @ 56
micron
11 @ 25
micron
5 @ 30
micron
7 @ 25
micron
30 @ 50
micron
Thermal Conductivity
(W/m.K)
0.9 1.3 3.1 2.95 6.2 6 2.4 1.3
Operating
Temperature (°C)
-50 to +150 -40 to +200 -40 to +200 -40 to +200 -50 to +120 -50 to +120 -40 to +150 -50 to +180

Sealing, Thermal Adhesives and Potting
Grade Number AS1802 AS1700 AS1724 AS1726 QSil553 ER2220 UR5633
Colour Light Grey Translucent Translucent Translucent Dark Grey Grey Grey
Material Type 1 Part Silicone 1 Part Silicone 1 Part Silicone 1 Part Silicone 2 Part Silicone 2 Part Epoxy 2 Part Urethane
Application
and
Benefits
Thermally conductive
Non corrosive adhesive
Non corrosive
paste sealant
Non corrosive
semi flowable
sealant
Non corrosive
highly flowable
sealant
Flame retardant
thermally conductive
potting
Flame retardant
thermally conductive
potting
Flexible
flame retardant
thermally conductive
Density 2.2 1.1 1.05 1.04 1.6 2.2 1.65
Mixed Viscosity
(cp)
350000 Paste 44000 3100 4500 15000 30000
Mix Ratio by
Volume
none none none none 1.1 8:2:1 8:8:1
Pot Life (mins) none none none none 70 120 15
Fixture time (mins) 3 10 10 10 TBA 360 40
Full Cure (hrs) 24 24 24 24 24 24 24
Shore Hardness 67A 30A 19A 30A 32A 90D 90A
Thermal Conductivity (W/m.K) 2.2 0.2 0.2 0.2 0.68 1.54 1.24
Operating Temperature (°C) -50 to +220 -50 to +220 -20 to +200 -50 to +200 -55 to +260 -40 to +130 -50 to +125
Approvals UL94V0
approved
Meets UL94V0 Meets UL94V0

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