Tamco® Tank Material Information

Linear Low Density Polyethylene resin used for rotationally molded tanks:

• Density: 0.937 g/cm3
• Tensile Strength at Yield: 2,400 psi
• Elongation at Yield: 20%
• Flexural Modulus: 90,000 psi
• Impact Strength -40°F, 0.125”: 60 ft-lb
• Impact Strength -40°F, 0.250”: 160 ft-lb

Polypropylene sheet used for welded polypropylene tanks and trays:

• Density: 0.9g/cm3
• Tensile Strength: 4,900 psi
• Elongation at Yield: 9%
• Flexural Modulus: 190,000 psi

High Density Polyethylene sheet used for welded polyethylene tanks and trays:

• Density: 0.96 g/cm3
• Tensile Strength: 4,600 psi
• Elongation at Break: >600%
• Flexural Modulus: 225,000 psi

Note: Properties are typical, and it is up to the end user to determine the suitability of a Tamco® Tank material for their application.

Chemical Service Temperatures

Continued or prolonged service with certain chemicals at elevated temperatures may reduce the life of polyethylene and polypropylene tanks. The effects of the temperature on the material will depend on the chemical, the specific gravity of the chemical, the size and model of the tank the chemical is to be stored in, and the tank wall thickness. Depending upon the chemicals to be stored, Tamco® Polyethylene tanks will handle temperatures of up to 140°F while the Tamco® Polypropylene tanks will handle up to 200°F. Please note that higher service temperatures will lower the specific gravity rating of the tank.

Ultraviolet Light Exposure

Tamco® Polyethylene tanks molded with Linear Low Density Polyethylene are UV Stabilized. UV stabilizers that are added to the resin will reduce the harmful effects of ultraviolet light exposure and are intended to extend the life of a tank over similar materials that are not compounded with stabilizers. Welded tanks are not UV stabilized, and direct sunlight should be avoided.

Specific Gravity

The standard Tamco® tanks have a 1.5 specific gravity. Specific Gravity is the chemical weight ratio divided by the water weight per gallon (8.33 lb. per gallon).  As an example, if a chemical weighs 10 lb. per gallon, the specific gravity of the chemical is 10.0/8.33 = 1.2. (Metric: kilogram/cubic meter or gram/liter).

Note: We can custom mold and weld tanks with thicker walls to handle heavier media.

Material Color

The standard color for Tamco® tanks is natural (translucent white). We offer a line of brine tanks and opaque black covers.

FDA Compliance

Tamco® Natural Polyethylene Tanks are manufactured of a Linear Low Density Polyethylene that meets FDA standards. The resin complies with FDA regulation 21 CFR 177.1520 (olefin polymers), Paragraphs (c) 3.1a and (c) 3.2a, and may be used as articles or components of articles intended for use in contact with food, including use in articles used for packing or holding food during cooking at temperatures, not over 212°F.

Tamco® welded polypropylene tanks are made from homopolymer polypropylene sheet and welding rods that meet FDA requirements.

Tamco® welded polyethylene tanks and trays are made from high density polyethylene sheet and rods that meet FDA requirements.

All Tamco® tanks are BPA and phthalate free.