SS-02 R6

PAGE 4 OF 6

Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.

KOA SPEER ELECTRONICS, INC.

5. Characteristics (Continued)

8

9

Solderability

(Method 208)

Resistance

to solvents

Over 3/4th of the lead-

wire surface area shall

be covered with solder,

when judged visually.

No evidence of

mechanical damage

in appearance and

marking.

The lead-wire is immersed for 2 - 3 seconds

in methanol solution containing rosin body is

immersed in melted solder at temperature of

235 ±5°C for a period of 3 ± 0.5 sec. as far as

the point 2 - 2.5mm from the resistor body.

1.

Sample shall be immersed in ultrasonic

power at 35 ± 5°C for 2 minutes.

2.

After samples shall be immersed in specified

solvents (following table) for 3 minutes, the resistor

shall be immediately wiped with a dry cloth

(velvet or gauze)

(Solvents)

1.

Iso-proryle alcohol

2.

1-1-1 trichloroethane

10

Dielectric

withstanding voltage

(Method 301)

The resistor develops

no dielectric breakdown.

Resistance change shall

be ± (1% + 0.05 ohm)

of the Pre-test value.

The resistors shall be clamped in the trough of a

90°C metallic V-block of such size that the resistor

body does not extend beyond the ends of the

trough. The resistor leads shall be positioned such

that they are no closer to the V-block than if they

were parallel to the sides of the V-block. This

prevents unnecessary proximity of the leads to

the block, while permitting complete seating of

the resistor body in the block.

Sine wave RMS voltages from an alternating

current supply at commercial line frequency not

more than 100 Hertz as specified in Table 1 shall

be applied at the rate of approximately 100 volts

per second between resistor terminals connected

together and the V-block, and held for 5 seconds.

The coating cab withstand the overload test, with no possibilities of ignition.

1.

Overload Test as per UL-492, Item 13:

A piece of cotton cloth (A piece of gauze untreated corresponding to Nos 32-28

that measures 36 inches in width and 14 - 15 yards per pound) is wound around

a resistor. Then, the resistor is applied with voltage which is increased by two

times, three times, . . . ten times the rated voltage at intervals of one minute till

the resistor is broken down. If the cotton cloth is found igniting, the resistor shall

be considered unacceptable.

The coating is completely proof against any kind of heat sources. Even if

exposed to gas burner flames or heated red with nichrome wire wounded, the

coating will not flame, nor soften and melt to drop.

2.

Hot-wire Ignition Test as per UL-492-2, Item 9:

A nichrome wire (Mixture of Cr 20% and Ni 80% which measures 0.0201 inches

in diameter and 865 feet per pound, and having 1.61 ohm per foot) is wound a

resistor at intervals of 1/4 inch so as to result in power consumption of 65W or

more. Then, the resistor is heated red with electricity supplied to the nichrome wire.

11

Flame-proof

(UL-492-2)

SS-02 R6

6/20/07

3:37 PM

Page 4