Cross Section of Ribbon

PYROFUZE ® consists of two metallic elements in intimate contact with each other. When these two elements are brought to the initiating temperature, they alloy rapidly resulting in instant deflagration without support of oxygen. Initiation is by heat and heat alone. All that is required is the exposure of the composite to the proper minimum temperature. The trigger reaction will reach temperatures in excess of the boiling point of the constituents. Once started, the reaction will not stop until alloying is completed or the unalloyed composite is subjected to some form of massive cooling that overwhelms the composite so that it cannot reach minimum operating temperature. The reaction end products consist normally of tiny discreet particles of the alloy of the participating materials. The present PYROFUZE® composition was chosen for a number of desirable characteristics; it is a composite of alloys of Palladium and Aluminum. It is available in the following physical forms: Wire; and, Ribbon rolled from wire.

It cannot be overemphasized that the PYROFUZE® reaction is not of an explosive or pyrotechnic nature. The only energy released is thermal (approximate minimum reaction temperature 2800° C/5000° F, 325 calories per gram, 2890 calories per cubic centimeter). The minimum initiation temperature is 650° C/1200° F.

Wire:

Chemical composition:

• Outer Jacket
  • 5% Ruthenium
  • Balance Palladium
• Inner Core
  • #5056 Aluminum

Ribbon:

Ribbon can be fabricated from round wire. Maximum practical aspect ratio is 10:1; i.e. width to thickness

Calories per Foot of Selected Sizes of PYROFUSE® Wire

.001"	-	0.4 cal/ft.
.002"	-	1.4 cal/ft.
.003"	-	3.1 cal/ft.
.004"	-	5.8 cal/ft.
.005"	-	8.9 cal/ft.
.006"	-	13.2 cal/ft.
.007"	-	17.8 cal/ft.
.008"	-	23.4 cal/ft.
.009"	-	29.8 cal/ft.
.010"	-	37.1 cal/ft.
.012"	-	53.2 cal/ft.
.015"	-	83.5 cal/ft.
.020"	-	148.6 cal/ft.

				Amperes to Ignite
Diameter (Inches)	Milligrams per 20 CM	Calculated Resistance /ft. at 25°C		Air	Argon	Vac.
.020	300.00	0.155		9.50	8.80	6.500
.015	169.00	0.275		6.90	6.00	4.100
.012	108.00	0.430		5.00	4.40	2.800
.010	75.00	0.620		4.00	3.50	2.200
.009	61.00	0.760		3.50	3.00	1.800
.008	48.00	0.970		3.00	2.70	1.500
.007	36.60	1.260		2.60	2.20	1.200
.006	27.00	1.720		2.10	1.85	0.900
.005	18.80	2.500		1.70	1.50	0.650
.004	12.00	3.860		1.30	1.15	0.430
.003	6.75	6.900		0.95	0.80	0.250
.002	3.00	15.500		0.60	0.50	0.100
.0015	1.69	27.500		0.45	0.35	0.060
.001	0.75	62.000		0.30	0.25	0.020
.0009	0.61	76.000		0.26	0.23	0.018

View Graph of Threshold Ignition Currents and Other Data

View Graph of Electrical Functioning Time Data