Texas Comptroller of Public Accounts

Texas Comptroller of Public Accounts, Glenn Hegar

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Texas Specification No. 485-38-02

Effective Date: July 30, 1971

Reformatted: January 22, 1996




1. SCOPE: This specification covers dishwashing compound for use in mechanical dishwashing machines in soft, medium or hard water (up to 30 grains hardness).

2. APPLICABLE SPECIFICATIONS AND STANDARDS: References to specifications, standards and test methods shall be to the issues in effect on the date of the Invitation for Bids.

3. DEFINITIONS: Terminology used in this specification is intended to be generic in nature and consistent with meanings that have been defined through general use and/or accepted trade practices. Where variant meanings may exist, the applicable interpretation shall be determined by the Texas Procurement and Support Services (TPASS).

3.1. Commission: Texas Procurement and Support Services (TPASS).

4. REQUIREMENTS: Diishwashing compound furnished under this specification shall meet the following minimum requirements:

4.1. Chemical Composition: The chemical composition shall be as follows:



Composition Percent by Weight Minimum Percent by Weight


Phosphorus Oxide (as P2O5 ) 26 30
Silicates (as SiO2 ) 16 18
Organic Detergent 1 2
Matter Insoluble in Water -- .005

4.3.1. Raw Materials: Shall be as follows:

Name of Component Conforming to Texas Specification No.

Sodium Tripolyphospahte 180-74-03

Sodium Metasilicate, Anhydrous 180-84-02

Surfactant-Detergent and Defoamer-Liquid 180-92-03

Sodium Carbonate (Soda Ash) 180-24-02

Note: The ingredients used shall not be contaminated with toxic amounts of poisonous compounds such as arsenic, lead, mercury, antimony, or any other material having a deleterious effect.

4.3.2. Containers and Container Sizes: Dishwashing compound shall be furnished in new containers having replaceable and resealable covers or heads to protect contents from atmospheric conditions after opening. Container sizes and types shall be as listed below. The size to be furnished shall be specified in the Invitation for Bids. Container Sizes:

(1) Five pound box , (10 boxes per case)

(2) 50 pound box or bag

(3) 125 pound drum

(4) 350 pound drum

4.3.3. Purchase Unit: Dishwashing compound shall be purchased by net weight in pounds.

4.3.4. Form and Solubility: The dishwashing compound may be supplied in either power, granular, or crystalline form but must dissolve readily in tepid water. Large variations in color or particle size, which are indicative of non-uniformity of composition, shall be cause for rejection.

4.3.5. Odor: The compound shall be free from strong or objectionable odor either in dry form or in solution.

4.3.6. Turbidity: When tested by the method described in Paragraph 6, the weight of the precipitate shall not exceed eleven (11) milligrams.

4.3.7. Foaming: When tested by the method described in Paragraph 6, no foam or suds shall be detected.

4.3.8. Corrosion: The compound shall not be corrosive to aluminum, brass or bronze, silverware, and shall not cause damage to china or plastic wares. When tested by the method described in Paragraph 6, the compound solution shall without visible action on bare aluminum alloy.

4.3.9. pH and Buffer Capacity: When tested by the method outlined in Paragraph 6, the compound solution shall have an initial pH of not less than 10.5 and not higher than 12.0. the addition of 10 ml of 0.1N hydrochloric acid shall not reduce the pH of the solution to less than 9.0.

5. SAMPLES: Unless otherwise specified in the Invitation for Bids, no prepurchase samples shall be required. Samples tested shall be taken from regular orders.

6. TESTING: Testing shall be done by or at the direction of, the Commission and/or the receiving State agency. Tests shall be performed on products from shipments to ordering agencies. In the event products tested fail to meet or exceed all conditions and requirements of this specification, the cost of the samples used and the cost of testing shall be borne by the supplier.

6.1. TESTS: The product furnished under this specification shall be tested by the following methods or approved equally applicable procedures:

6.1.1. Preparation of Stock Solution: For the procedures described in the following section, a 5% stock solution of the compound being tested shall be used to prepare test solutions of the prescribed concentrations. To prepare the stock solution dissolve a 50 gram portion of the well mixed sample in distilled water, heating if necessary, cool to room temperature, make up to a liter with distilled carbon dioxide free water, and mix thoroughly.

6.1.2. Turbidity: Transfer to a 500 milliliter graduated flask the calculated amount of reagent-grade calcium acetate, monohydrate (accurately weighed and based on an accurate determination of its calcium content), equivalent to 0.4275 grams of calcium carbonate. Dissolve in distilled water from which carbon dioxide has been removed by boiling, make up to 500 milliliters with carbon dioxide-free water and mix. (One milliliter of this solution should contain the equivalent of 0.855 milligrams of calcium carbonate.)

Transfer 50 ml of the standard calcium acetate solution to a 250 ml volumetric flask, add 200 to 150 ml of water and then add 15 ml of the 5% stock solution. Mix thoroughly and then dilute to the 250 ml mark with carbon dioxide-free distilled water. This solution now contains the equivalent of 10 grains (171 ppm) of calcium carbonate per gallon and a 0.3 per cent concentration of the test compound.

Keep the solution at 180 °F for 15 minutes. If no turbidity is noted, report turbidity none. If turbidity is present, filter on a weighed Gooch Crucible, was with hot distilled water, dry at 105 °C. and weigh. Report the weight of precipitate as milligrams of turbidity.

6.1.3. Foaming Test: Add 5 milliliters of the 5% stock solution of the sample being tested to 45 milliliters of distilled water. Place in a Pyrex glass-stoppered round bottle of approximately 125 ml capacity. Heat to 155-160 °F and shake vigorously. If no lather forms or if a light lather forms and disappears within 30 seconds except for a faint ring of small bubbles around the edge of the surface, report no foam or suds detected.

6.1.4. Corrosion Test: Prepare a 0.3 percent solution of sample being tested by dilution of the 5% stock solution. Totally immerse duplicate specimens (about 3" x 0.75" x 0.064") of bright finished uncoated aluminum alloy sheet, conforming to Federal Specification No. QQ-A-250, 2d, Temper H14, in the 0.3% solution for 5 hours at 180 °F. After five hours, remove the specimens, rinse with distilled water and dry. If neither of the specimens is noticeably altered in appearance as a result of exposure to the test solution, the detergent is considered to have passed the test.

6.1.5. pH and Buffering Capacity Test: Tests shall be made with a pH meter having a sensitivity and readability of 0.05 pH unit. A sealed glass type electrode shall be used in conjunction with a potassium chloride - calomel reference electrode. The pH meter shall be calibrated before use by checking against a standard buffer solution of pH 10.

A concentration of 0.4 percent shall be used for the test for pH and buffering capacity. The test solution is prepared from the 5% stock solution. Into a 250 ml volumetric flask, transfer 20 ml of the 5% stock solution of the compounds and dilute to mark with carbon dioxide free distilled water.

Pipette a 50 ml portion of the resultant 0.4 percent solution into each of two beakers. Use the first beaker of solution to determine the pH at 25 °C. To the second beaker containing 50 ml of the 0.4 percent solution; add 10 ml of 0.1 H hydrochloric acid, stir thoroughly, and determine the pH.

7. INSPECTION: Products furnished under this specification shall be inspected by, or at the direction of the Commission and/or the ordering State agency either at the destination or place of manufacture.

8. PACKING / PACKAGING: Packing for shipment shall be in accordance with the manufacturer's standard practice and in a manner readily accepted by common carriers engaged in interstate commerce. Within the shipping carton, units shall be packed in a manner designed to minimize damage during the shipment because of rough or improper handling.


9.1. MARKING: Each shipping container shall be clearly marked with the following:

9.1.1. Name of contents, including brand name, if any.

9.1.2. Quantity contained.

9.1.3. Name and address of the manufacturer.

The following information shall either be marked on the container or appear on the shipping documents:

9.1.4. Order number or contract number.

9.1.5. Name and address of ordering agency.

9.1.6. Agency requisition number.

9.2. LABELING: Each product container shall bear a securely affixed and durable label showing the following:

9.2.1. Name of contents.

9.2.2. Quantity contained.

9.2.3. The manufacturer's directions for use.

9.2.4. Name and address of the manufacturer.

10. COMPLIANCE: In order for consideration to be given to the bid on an item under this specification, the bidder must comply with the following:

10.1. PRODUCT IDENTIFICATION: The make, model number, name of the manufacturer, brand or trade name, etc., as applicable, of the item which the vendor proposes to furnish must be stated as part of the bid.

10.2. EXCEPTIONS: Notwithstanding the above, any exception taken by the bidder to the requirements and conditions of this specification must be stated and described in detail as a part of the bid. If no exceptions or deviations are identified in this manner, the items must be furnished exactly as described herein.

10.3. PROOF: The bidder shall bear the burden of proof of compliance with this specification.

11. ORDERING DATA: When ordering products conforming to this specification the requisitioning agency shall specify the following:

11.1. The number of this specification (485-38-02).

11.2. Size container desired.

11.3. The total quantity required.

12. PRODUCT INFORMATION: When used as directed this compound is safe for use in washing glassware, chinaware, plastic ware, silver, bronze, brass, stainless steel, and bare aluminum ware. Do not use this compound on anodized aluminum ware as it will damage the anodized finish.

13. AVAILABILITY OF SPECIFICATIONS: Copies of this specification may be obtained by calling or writing:

Bid Services

Texas Procurement and Support Services

P.O.Box 13186

Austin, TX 78711-3047

(512) 463-3416

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