Chemical Stability of SUMIKASUPER LCP

Evolved Gases from Moldings

When SUMIKASUPER LCP moldings are heated, extremely low amounts of gases are generated, as is shown in Figure 1

Figure 1 : Mehtod of Analysis of Gas Generation from the Moldings

Figure 1 : Mehtod of Analysis of Gas Generation from the Moldings

Figure 2 : Amount of Gas Generation from SUMIKASUPER LCP

Figure 2 : Amount of Gas Generation from SUMIKASUPER LCP

Analysis device : Head space Gas Chromatography
Specimen pre-treatment conditions : 120 deg C, 20hr heating

Water Absorption

SUMIKASUPER LCP shows very low water absorption of only 0.02%.
As well, even if left in water over extended periods of time, almost no changes in weight or dimensions will be observed (Figure 3).

Figure 3 : Changes in Weight and Dimensions due to Water Absorption (E6008)

Figure 3 : Changes in Weight and Dimensions due to Water Absorption (E6008)

Test piece : 64x64x3t mm

Chemical Resistance

The table below shows data on chemical resistance for SUMIKASUPER LCP. SUMIKASUPER LCP possesses outstanding chemical resistance and will not expand or deteriorate when exposed to oils, even at high temperatures.
However, the evaluation of effects should be conducted on actual moldings prior to usage.

Table 1 : Chemical Resistance

Chemical name Condition SUMIKASUPER LCP
Evaluation
Temperature(deg C) Time
0% hydrochloric acid 50 30days
20% sulfuric acid 50 30days
40% nitric acid 50 30days
Glacious acetic acid 50 30days
10% sodium hydoxide 50 30days ×
10% aqueous ammonia 50 50 30days ×
Acetone Reflux 100hr
Methylethyl ketone Reflux 100hr
Trichloroethane Reflux 100hr
Methylene chloride Reflux 100hr
Toluene Reflux 100hr
Methanol Reflux 100hr
Ethanol Reflux 100hr
Ethyl acetate Reflux 100hr
Dimethyl formamide Reflux 100hr ×
Gasoline Room temperature 30days
Engine oil 120 2000hr
Gear oil 120 2000hr
Evaluation ◯ : Reduction of tensile strength 5% or less Change of weight 2% or less
× : Not usable.

Hot Water Resistance

SUMIKASUPER LCP still demonstrates effective levels of strength, even after 2000 hours of soaking in hot water, at a temperature of 80 deg C. However, when exposed to steam at temperatures of greater than 120 deg C, hydrolysis begin to occur, causing large strength degradation and rendering the product unusable.

Figure 4 : Hot Water Resistance (80 deg C)

Figure 4 : Hot Water Resistance (80 deg C)
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