GUARDIAN INSULATING VARNISH (CLASS ‘H’) solvented modified isophthalic varnish

Description : 

INSULATING VARNISH (CLASS ‘H’) is a solvented modified isophthalic varnish with long term tank stability and a thermal rating of 180⁰C . Has excellent penetration and combines flexibility with high bond strength capabilities.
Applications : An ideal impregnant for all kinds of stators, armatures, and transformers where excellent surface finish quality is required. Is compatible with most types of insulation products and systems.

Advantages :

• Excellent penetration combined with flexibility.
• Excellent cure characteristic, and bond strength.
• Excellent chemical and water resistance.
• High flash point : 34⁰C 
• Thermal index of 180⁰C  (Class H)
• Environmental friendly. Aerosol packing is CFC-free.

Instructions

1. INSULATING VARNISH (CLASS ‘H’)  is suitable for impregnation using components are ambient temperature or pre-heated. If components are pre-heated, precaution should be taken to ensure that the varnish is not exposed to temperature above 40oC. This will ensure excellent penetration whilst minimizing solvent loss from the tank.
2. Development of bond strength is a function of both curing temperature and time. Relatively low curing temperature of 130-140⁰C  at duration of approximately 4 – 6 hours may be sufficient if bond strength is not of prime importance e.g. in small transformers and fractional h.p. motors. 

For applications where windings will be expected to withstand harsh chemical environments or to endure high mechanical stress factors on for example, high speed armatures, traction machines, stators of large industrial motors or high output units such as 2 pole motors, curing temperature of at least 160⁰C  at duration of approximately 16 hours should be used.

Properties :
VISCOSITY (BS 3900 Type B4 Flow Cup)        135 – 165 seconds@ 21⁰C
NON-VOLATILE (as supplied)                          48 – 52%
SPECIFIC GRAVITY @ 21⁰C                           0.94 – 1.00
FLASH POINT (Abel Closed Cup)                    34⁰C
APPEARANCE                                               Clear Brown Amber