ASTM D537-85(1997)

Standard Specification for Sodium Metasilicate (Withdrawn 2001)

SCOPE
1.1 This specification for sodium metasilicate covers material suitable for various washing, cleaning, and scouring processes, with or without soap as conditions demand, and where a moderately strong alkaline material is desired.  
1.2 This material may be hazardous if not properly managed.  
1.3 Precautionary information for the safe use, storage, and disposal of this material should be preliminarily obtained from suppliers and others.  
1.4 In case of personal accident with this material, apply appropriate first aid; telephone the nearest Poison Control Center for assistance, and get medical attention immediately.

General Information

• Status: Withdrawn
• Publication Date: 09-Sep-1997
• Withdrawal Date: 09-Aug-2001
• ICS: 71.100.40 - Surface active agents
• Technical Committee: D12 - Soaps and Other Detergents

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 537 – 85 (Reapproved 1997)
Standard Specification for
Sodium Metasilicate
This standard is issued under the fixed designation D 537; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope Therefore, the calculation of net weight shall be based upon a
product containing 98 % of sodium metasilicate calculated as
1.1 This specification for sodium metasilicate covers mate-
Na SiO ·5H O for Type I or 91.5 % of sodium metasilicate
2 3 2
rial suitable for various washing, cleaning, and scouring
calculated as Na SiO for Type II. The net weight of the
2 3
processes, with or without soap as conditions demand, and
material to be paid for shall be calculated as follows:
where a moderately strong alkaline material is desired.
1.2 This material may be hazardous if not properly man- W 5 ~R 3 T!/98 for Type I (1)
aged.
W 5 ~R 3 T!/91.5 for Type II (2)
1.3 Precautionary information for the safe use, storage, and
where:
disposal of this material should be preliminarily obtained from
W 5 net weight of the material to be paid for,
suppliers and others.
R 5 net weight of the material as received,
1.4 In case of personal accident with this material, apply
T 5 total sodium metasilicate calculated as Na SiO ·
appropriate first aid; telephone the nearest Poison Control 2 3
5H O, and
Center for assistance, and get medical attention immediately.
T8 5 total sodium metasilicate calculated as Na SiO .
2 3
2. Referenced Documents 4.2 In the event that the calculation under 4.1 results in a
figure greater than 100 %, the seller waives the right to invoice
2.1 ASTM Standards:
the purchaser for any amount in excess of 100 %.
D 501 Test Methods of Sampling and Chemical Analysis of
Alkaline Detergents
5. Chemical Composition
3. Sodium Metasilicate 5.1 Sodium metasilicate, as received, shall conform to the
requirements as to chemical composition prescribed in Table 1.
3.1 Sodium metasilicate shall be a uniform product in one of
the following forms as specified by the purchaser:
6. Sampling and Analysis
3.1.1 Type I— White granular or crystalline material.
6.1 The material shall be sampled and analyzed in accor-
3.1.2 Type II— Granular anhydrous material.
dance with Test Methods
...