Pressure and oxygen concentration limits for the upward propagation of combustion of two aluminum alloys and two aluminum bronzes have been determined in oxygen diluted by either argon or nitrogen. The gas mixtures flowed over the metal specimens at a flow rate of 0.33 standard L/s in a 41-mm inside diameter vessel and at various absolute pressures to 10.4 MPa (1515 psi). The standard specimen configuration used for all metals was a 6.4-mm (¼ in.) diameter rod 76-mm (3 in.) long. Rods were ignited by passing 1500 to 2000 A at 6 V DC through a 6.4-mm diameter carbon steel promoter attached to their bottom ends. The effects of sample size and geometry were studied for aluminum Alloy 6061. The threshold pressure for the propagation of combustion in the standard aluminum Alloy 6061 specimen was significantly increased by the presence of very low concentrations of argon in the oxygen. In zero-grade oxygen (0.007% Ar, 99.993% O2), 6.4-mm diameter rods burned at an absolute pressure of 210 kPa (30 psi). Adding only 0.2% argon, however, increased the threshold pressure to 830 kPa (120 psi). In contrast, the effect of nitrogen as a diluent was much less marked, probably because of the reaction of nitrogen with aluminum and oxygen to form aluminum oxynitrides. The flammability of aluminum Alloy 5356 (5% magnesium) was slightly lower than that of aluminum Alloy 6061 (1% magnesium). Measurements to determine the effects of size and geometry on the flammability of aluminum Alloy 6061, showed that increasing rod diameter from 3 to 10 mm resulted in decreased flammability. The flammability of aluminum Alloy 6061 strips, 13-mm wide, was slightly lower than that of corresponding rods of a diameter equal to the strip thickness. The flammability of 6.4-mm inside diameter tubes of aluminum Alloy 6061 with 1.7-mm wall thickness was slightly lower than that of the standard specimen. With a wall thickness of 0.8 mm, however, the flammability was slightly higher. Two aluminum bronzes (6.5% aluminum, 2.5% iron, and 90.5% copper, and 10.5% aluminum, 3.5% iron, and 85.5% copper) had flammabilities only slightly lower than aluminum Alloy 6061, despite their high copper content.
Domestic orders are delivered via United Parcel Service (UPS) or United States Postal Service (USPS). Transit
times average 3 to 5 business days. Please be aware that UPS will not deliver packages to Post Office Boxes.
International orders are delivered via courier post services which can be either a postal service, courier
service, or a combination of both. Standard Service is untraceable. Please allow 4-7 weeks for delivery.
Please be aware that carriers will not deliver packages to Post Office Boxes. Because of the variability of
customs processes and procedures in different countries, ASTM International cannot guarantee transit times to
international destinations. Customs duty and taxes are the responsibility of the consignee.
Shipping & Handling charges follow the rate schedule, below:
Order Total
Shipping & Handling Fee (US Domestic)
Up to $50.00
$18.72
$50.01 to $100.00
$20.80
$100.01 to $150.00
$29.52
$150.01 to $250.00
$39.09
$250.01 to $500.00
$56.25
$500.01 to $750.00
$76.42
$750.01 to $1000.00
$93.15
$1000.01 to $1500.00
$121.27
$1500.01 to $2500.00
$158.38
$2500.01 to $4999.00
$209.04
$5000.00 to higher
FREE
Order Total
Shipping & Handling Fee (International)
Up to $50.00
$68.72
$50.01 to $100.00
$70.80
$100.01 to $150.00
$79.52
$150.01 to $250.00
$89.09
$250.01 to $500.00
$106.25
$500.01 to $750.00
$126.42
$750.01 to $1000.00
$143.15
$1000.01 to $1500.00
$171.27
$1500.01 to $2500.00
$208.38
$2500.01 to $4999.00
$259.04
$5000.00 to higher
FREE
Shipping and Handling charges are approximate. Additional charges may be incurred if your order requires multiple shipments. This does not apply to complete sets and sections.
