GOST 10772-78
GOST 10772−78 Coatings foundry parting water. General specifications (with Amendments No. 1, 2)
GOST 10772−78
Group В88
INTERSTATE STANDARD
COATINGS FOUNDRY PARTING WATER
General specifications
Water foundry coatings for mould paints. General specifications
ISS 01.040.25
25.220.40
OKP 41 9150
Date of introduction 1979−01−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of the machine tool industry of the USSR
DEVELOPERS
N. And. Davydov, Cand. tech. Sciences; L. G. guruleva
2. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from
3. REPLACE GOST 10772−64
4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
| The designation of the reference document referenced |
Item number |
| GOST 12.1.005−88 | 7.1 |
| GOST 12.3.002−75 | 7.1 |
| GOST 12.3.005−75 | 7.1 |
| GOST 1770−74 | 4.1.2.1; 4.5.1 |
| GOST 2138−91 | 4.7.1 |
| GOST 2226−88 | 5.3; 5.4 |
| GOST 6507−90 | 4.7.1 |
| GOST 6613−86 | 4.7.1 |
| GOST 8420−74 | 4.4 |
| GOST 8777−80 | 5.1 |
| GOST 9070−75 | 4.7.1 |
| GOST 13950−91 | 5.1 |
| GOST 18481−81 | 4.1.2.2 |
| GOST 19360−74 | 5.3 |
| GOST 25336−82 | 4.3.1; 4.7.1 |
| GOST 30090−93 | 5.4 |
| «Basic sanitary rules of work with radioactive substances and other sources of ionizing radiation» (OSP-72)* |
7.2 |
_______________
* Replaced with SP 2.6.1.799−99. Here and further. — Note the manufacturer’s database.
5. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)
6. EDITION with Amendments No. 1, 2 approved in December 1983, December 1987 (IUS 3−84, 2−88)
This standard applies to water nonstick coating, manufactured in the form of water-soluble pastes and powders.
Coverage after dilution designed for painting of sand casting molds and cores.
1. CLASSIFICATION
1.1. Coating, depending on the refractory filler are divided into the types listed in the table.1.
Table 1
| View |
Refractory filler |
| G |
Graphite |
| T |
Talc |
| TS |
Zircon concentrate |
| D |
Kyanite-sillimanite concentrate |
1.2. On the physical condition of the coatings are classified into two groups: fresh (N), powder (S).
1.3. For the sedimentation stability of diluted coating and strength layer of the coating to abrasion (see table.3) coatings are divided into the classes listed in the table.2.
Table 2
| Class | Limit sedimentation stability, %, not less |
Tensile strength, abrasion resistance, kg/mm, not less |
| One | 97 |
2 |
| 2 | 90 |
1 |
Table 3
| Name of the indicator |
The norm for brands | ||||||||
| paste |
powder | ||||||||
| GP-1 |
GP-2 | TP-1 | TP-2 | DP-2 | CPU-2 | GS-1 | TC-1 | CA-1 | |
| Appearance | Homogeneous mass | Homogeneous powder | |||||||
| Humidity, %, not more |
35 | 35 | 35 | 35 | 30 | 16 | 1,5 | 1,5 | 1,5 |
| Relative viscosity of the diluted coating on the viscometer VZ-4, with no more than |
25 | 20 | 20 | 20 | 27 | 16 | 25 | 20 | 25 |
| Sedimentation stability of diluted coating, %, not less |
98 | 95 | 97 | 95 | 90 | 92 | 98 | 98 | 97 |
| Appearance applied, dried and cooled layer |
Even layer without inclusions and cracks | ||||||||
| The strength of the coating layer, abrasion resistance, kg/mm, not less |
2,0 | 1,0 | 3,0 | 1,0 | 1,0 | 1,5 | 2,0 | 3,0 | 3,0 |
2. TECHNICAL REQUIREMENTS
2.1. Coating shall be manufactured in accordance with the requirements of this standard according to the formula and technological regulations, approved in the prescribed manner.
2.2. Physical-mechanical performance of the coating shall meet the technical requirements specified in table.3.
2.3. Coverage shall not contain impurities visible to the naked eye.
2.4. Before use, the coatings are diluted with water.
2.5. Recommendation for appointment of the coatings are listed in Annex 1.
3. ACCEPTANCE RULES
3.1. Pastes and powders to be taken by the parties. For the party to take the number one product of the brand presented for acceptance on the same document. The lot size is not more than 10 T.
3.2. At acceptance tests should be check on conformity to requirements of PP.2.2, 2.3. Tests will be on samples selected according to claim
3.3. If unsatisfactory test results of at least one of the indicators of a second check for twice the number of samples from the same batch.
Example of designation coatings based on talc (T), produced in the form of paste (P), with a limit of sedimentation stability of 95% and abrasion resistance 1 kg/mm (2):
TP-2 GOST 10772−78
The results of repeated tests are final and apply to the entire party.
3.4. On acceptance results for each batch of filled passport. The passport should contain:
the name of the manufacturer or trademark;
the name and brand of the product;
the number and weight of shipment;
the date of manufacture;
the designation of this standard;
the results of analyses;
the number and date of production.
4. TEST METHODS
4.1. Preparation of samples for testing
4.1.1. The selection of average samples
4.1.1.1. In the control pastes partial samples are taken from 10% of the seats of each party, not less than 5 seats. Partial samples are taken from barrels in equal amounts from the upper level and at a depth of 300−400 mm from the top level of pasta.
4.1.1.2. Under the control of powders partial samples are taken from 5% of the seats each party at least 10 seats. Partial samples are taken in equal amounts from the top (at the opening of the bag) and from a depth of 100−150 mm.
4.1.1.3. Selected partial samples together, mix and method of kvantovaniya average. The average weight of the sample should not be less than 1 kg.
4.1.1.4. An average sample is divided into two equal parts and placed in a tightly closed glass or porcelain jars. Banks labeled indicating the name and brand of coverage, name of manufacturer, batch number, date of manufacture, date of sampling, the names of probatoria. One jar of coating transfer to the laboratory for analysis, the other stored in for the warranty period.
4.1.2. Dilution of the coatings for testing
4.1.2.1. Equipment
Laboratory krasnoselka speed mixer 400−600 Rev/min recommended krasnoselka provided in Appendix 2.
Measuring cylinder with graduations 1−10 ml according to GOST 1770.
4.1.2.2. About 0.5 kg average sample coating is diluted with water to a density specified in table.4.
Table 4
Density, g/cm
| GP-1 | GP-2 | TP-1 | TP-2 | DP-2 |
CPU-2 | GS-1 | TC-1 | CA-1 |
| 1,28−1,30 | 1,30−1,35 | 1,35−1,40 | 1,40−1,42 | 1,70−1,80 |
1,95−2,00 | 1,25−1,30 | 1,35−1,40 | 1,85−1,90 |
In krasnoselka first load the water and then cover. Coverage is administered by separate portions with further mixing.
When the download finishes, the coating mix. The time of mixing of the paste at least 20 minutes, and powders of at least 40 min.
The homogeneity of the diluted coating is controlled visually by the appearance of the coating layer on the glass according to claim
In determining the density of the measuring cylinder is weighed to the nearest 0.01 g, fill with diluted coating to the level of 10 ml and weighed with the same precision.
Density () in g/cm
is calculated by the formula
where is the mass of the filled graduated cylinder, g;
— mass of empty graduated cylinder,
Note. In the workshop environment allowed the definition of density by hydrometer of coatings according to GOST 18481.
4.2. External pastes and powders determined visually by examination of samples taken in natural diffused light.
4.3. Determination of moisture pastes and powders
4.3.1. Equipment
Drying Cabinet with closed heating elements with devices for measuring and regulating temperature.
The Cup for weighing (box) according to GOST 25336.
Desiccator, according to GOST 25336.
4.3.2. Analysis
The portion of the average sample coverage (10±0,01) g was placed in box, pre-weighed to the nearest 0.01 g and dried in a drying Cabinet at 105 °C — 110 °C to constant weight (about 2 hours).
The coating is dried, if the subsequent weighing after further drying for 15 min will give a reduction in mass, not more than 0.01 g.
Before each weighing box coated is cooled in the desiccator to the temperature of (20±3) °C.
4.3.3. Processing of the results
Humidity () in percent is calculated by the formula
where is the mass of buxa coated before drying, g;
— Massa buxa coated after drying, g;
— suspension coating,
4.4. Determination of conditional viscosity
Viscosity of the coating, diluted according to claim 4.1.2, determined according to GOST 8420.
4.5. Determination of sedimentation stability
4.5.1. Equipment
Measuring cylinder with graduations 0−250 ml according to GOST 1770.
4.5.2. Analysis
The coating prepared according to claim
4.5.3. Processing of the results
Sedimentation stability () in percent is calculated by the formula
where is the total volume of the column of coating in the cylinder, ml;
— the volume of the clarified upper layer coating in the cylinder, ml.
4.6. The appearance of the coating is determined visually upon inspection of glass plates coated on glass and dried coating according to claim
4.7. Determination of abrasion resistance
4.7.1. Equipment and materials
Installation for testing
The installation includes (see drawing) 1 viscometer brand VZ-4 according to GOST 9070, stand with 2 frosted glass 3 and the stop for the glass plate 4 coated tank 5 for forming sand, light source 6 power not exceeding 10 watts.
Plate of fototeca length (120±1) mm, width (60±1) mm and thickness 1,2−2,0 mm.
Molding sand according to GOST 2138, otmechennyj, dried, and sieved through sieve N 063 according to GOST 6613, and then through a sieve N 0315 GOST 6613. For the analysis take the sand remaining on the sieve N 0315.
Drying Cabinet with closed heating elements and devices for measuring and regulating temperature.
Micrometer type MKO-25 according to GOST 6507.
Desiccator, according to GOST 25336.
4.7.2. Preparation for assay
Glass plates used in the analysis, first carefully wash with warm water, dried in a drying Cabinet at 105 °C — 110 °C for 5−10 min and cooled in a desiccator to (20±3) °C.
By micrometer measure a thickness of the plate not less than three locations with a precision of 0.01 mm and calculate the arithmetic mean value of thickness.
Measure out 100 ml of the coating prepared according to claim 4.1.2, and poured onto a glass plate set at an angle of 45°. The excess coating merge into the plate placed under the bowl. Then the plate is turned about an axis perpendicular to its plane by 180° and the operation repeated, only the coating is poured, collected in the bowl.
After coating, the plate is installed horizontally (with cover up) and placed in this position in a drying Cabinet. In a desiccator plate is kept at a temperature (150±5) °C for 20 min, then removed and cooled in a desiccator to a temperature of (20±3) °C.
After cooling, a micrometer, measure the thickness of the plate is coated with not less than three locations with a precision of 0.01 mm and calculate the arithmetic mean value of definitions.
4.7.3. Analysis
The plate coated is placed under the outlet of the viscometer VZ-4 at the frosted glass covering up and fix so that the sample did not move during the test. Include the light source. Using the viscometer on the plate pour the molding sand as long as the coating at the point of impact of the sand will not be worn down to the glass. The abrasion is stopped, when the diameter of the destroyed area of the coating is 1.5−2.0 mm. Mass of sand used for abrasion, weighed to the nearest 0.01 kg.
Conduct at least three tests, with each test in a new area of coverage.
Note. The moulding sand after 50 times of usage should be replaced or re-otmechen and sifted according to claim
4.7.4. Processing of the results
The strength of the coating to abrasion () to kg/mm is calculated by the formula
where is the mass of sand used for abrasive resistance, kg;
— arithmetic mean value of the thickness of the glass plate, mm;
— arithmetic mean value of the thickness of the glass plate, coated, mm.
For test result take the arithmetic mean value definitions that differ from the average definition is not greater than ±20%.
5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE
5.1. The paste shall be Packed in metal according to GOST 13950 or wooden churchyard 8777 barrels lined inside with plastic bags. After filling the barrel should be hermetically closed.
5.2. The paste shall be Packed in containers, pre-cleaned from dust, debris and residues of other materials.
Packing pastes in recycling metal packaging and used wooden containers should be carefully washed and dried the barrels.
The packaging of pasta in wooden containers is carried out after the repair.
5.3. Powder grades GS-1 and TS-1 shall be packaged in multiwall paper bags according to GOST 2226 or polyethylene bags-inserts according to GOST 19360.
5.4. Powder grade CA-1 should first be Packed in multilayer paper bags according to GOST 2226, and then in cloth bags with a base of viscose yarn according to GOST 30090 or polypropylene filaments at the branch normative-technical documentation.
(Changed edition, Rev. N 2).
5.5. Bags Packed powder needs to be sewn.
5.6. On each barrel and each bag gets a label.
The label should contain:
the name of the manufacturer or trademark;
the name and brand of the product;
batch number;
the gross and net weight;
the date of manufacture;
the designation of this standard.
5.7. Pastes and powders transporterowych in covered vehicles. The paste is allowed to be transported in open vehicles under the tarp.
5.8. Coatings should be stored in closed premises, excluding ingress of moisture, at temperatures from 0 °C to 30 °C.
6. OPERATING INSTRUCTIONS
6.1. After transportation at subzero temperature before use, paste should be kept at temperatures below 10 °C for at least 24 h.
6.2. When breeding coatings it is recommended to use a blade krasnoselka with reflective baffles in the reactor and with the frequency of rotation of the rotor of the mixer 150−300 rpm in accordance with Annex 2.
6.3. Dilution of powder in a production environment requires more intense mixing than the dilution of the pastes.
6.4. On linear forms and cores coating applied by brush or spray.
7. SAFETY REQUIREMENTS
7.1. Safety requirements for the manufacture, application and testing of coatings shall meet GOST 12.3.002, GOST 12.3.005, GOST
7.2. Safety requirements for the manufacture, application and testing of coatings grades of TSP-2 and CA-1 must satisfy p.7.1, and «Main sanitary rules of works with radioactive substances and other sources of ionizing radiation» (OSP-72) of the Ministry of health of the USSR.
7.3. In the premises where work is being carried out with zirconium concentrate, it needs to be ventilation with a five-fold air exchange and allow for wet cleaning of floor and equipment surfaces.
7.4. Persons associated with the preparation and application of coatings, must be provided with PPE, clothing, footwear and safety devices according to regulations approved in the prescribed manner.
8. MANUFACTURER’S WARRANTY
8.1. The manufacturer must ensure compliance of nonstick coatings to the requirements of this standard under the conditions of operation, transportation and storage.
8.2. Warranty period of storage of the pastes is 6 months, and powders — 12 months from date of manufacture.
ANNEX 1 (recommended). RECOMMENDATIONS FOR THE PURPOSE OF CASTING WATER NONSTICK COATINGS
ANNEX 1
Recommended
| Mark | Appointment |
| GP-1 | For molds and cores small, medium and large iron castings |
| GP-2 | For molds and cores for small and medium iron casting |
| TP-1 | The same. For molds and cores, castings from non-ferrous alloys |
| TP-2 | For molds and cores, castings from non-ferrous alloys, small iron casting |
| DP-2 | For molds and cores, castings from carbon steel |
| CPU-2 | For molds and cores, castings from carbon and alloyed steel, large cast iron castings |
| GS-1 | For molds and cores small, medium and large iron castings |
| TC-1 | For molds and cores, castings from non-ferrous alloys, small and medium iron casting |
| CA-1 | For molds and cores, castings, carbon and alloy steels, cast iron large castings |
APPENDIX 2 (recommended). KRASNOSELKA FOR BREEDING NONSTICK COATINGS
ANNEX 2
Recommended
| The ratio of parameters |
The value of |
| 1,6−3,0 | |
| 10,0−12,0 | |
| 1,0−6,0 | |
| 5,0−10,0 | |
| 1,0−1,3 | |
| 1,2−1,4 | |
| Of 5.0−8.0 |
1 — reactor-mixer; 2 — shaft mixer; 3 — a reflective partition; 4 — blade mixer
