GOST 10533-86

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  ГОСТ 10533-86

GOST 10533−86 Tape cold-rolled thermostatic bimetallic. Specifications (with Amendments No. 1, 2)

GOST 10533−86
Group B34

INTERSTATE STANDARD

TAPE COLD-ROLLED THERMOSTATIC BIMETALLIC

Specifications

Cold-rolled thermostatic bimetallic strip.
Specifications

OKP 12 6100

Date of introduction 1988−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of ferrous metallurgy of the USSR

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 11.10.86 N 3048

3. REPLACE GOST 10533−63

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	Item number
GOST 166−89	4.2
GOST 427−75	4.2
GOST 503−81	1.4, 1.5
GOST 2789−73	4.4
GOST 2991−85	5.3
GOST 3282−74	5.4
GOST 3560−73	5.4
GOST 4381−87	4.2
GOST 6009−74	5.4
GOST 6507−90	4.2
GOST 7565−81	4.1
GOST 7566−94	3.6, 5.1
GOST 8828−89	5.3, 5.4
GOST 9569−79	5.4
GOST 10354−82	5.4
GOST 10396−84	5.3, 5.4
GOST 10994−74	2.2
GOST 12344−88	4.1
GOST 12345−2001	4.1
GOST 12346−78	4.1
GOST 12347−77	4.1
GOST 12348−78	4.1
GOST 12350−78	4.1
GOST 12352−81	4.1
GOST 12355−78	4.1
GOST 12356−81	4.1
GOST 12357−84	4.1
GOST 12766.2−90	4.9
GOST 14192−96	5.8
GOST 14253−83	5.4
GOST 15150−69	5.7
GOST 16272−79	5.4
GOST 20799−88	5.10
GOST 21650−76	5.9
GOST 24597−81	5.9
GOST 28473−90	4.1
OST 14.15.193−86	5.4

5. By the resolution of Gosstandard dated 08.07.92 N 661 removed the limitation of the validity period

6. EDITION with Amendments No. 1, 2 approved in January 1988, July 1992 (IUS 4−88, 9−92)


This standard applies to cold rolled strip of thermostatic bimetallic, made of precision alloys for the manufacture of sensitive to temperature change elements of control and measuring instruments and apparatus.

Thermobimetals consists of two or more layers of metals or alloys (active, passive, intermediate components) with different temperature coefficients of linear expansion, welded together over the entire surface of contact.

Established by this standard indicators of technical level are provided for highest and first quality categories.

1. ASSORTMENT

1.1. The tape is divided:

mind the edges:

edged —

unedged Board;

physical properties:

with a normalized electrical resistivity — er,

with a normalized specific bending And

with a normalized sensitivity coefficient, M,

with a normalized specific bending and a specific electric resistance — AE,

with a normalized sensitivity coefficient and electrical resistivity — me;

the magnitude of the radius of longitudinal and transverse curvature of the tape thickness of 0.3 mm or more:

Class I — PK,

Class II — PC;

the value of the maximum deviation of the specific curve and sensitivity coefficient:

Class I — I, the highest category of quality

II class — II, the first category of quality;

the nominal value of specific bending and coefficient sensitivity thermobimetallic brands ТБ200/113, ТБ160/122:

group a — no symbol,

group B — B.

1.2. Brand thermostatic bimetallic and their components shall be as specified in table.1.

Table 1

Brand thermobimetallic	Brand components
The active layer	The passive layer	The intermediate layer
ТБ200/113 (ТБ2013, ТБ36)	75GND	36N	-
ТБ160/122 (ТБ1613, ТБ37)	75GND	45NKH	-
ТБ148/79 (ТБ1523, ТБ72)	20NG	36N	-
ТБ138/80 (ТБ1423, ТБ3)	24NKH	36N	-
ТБ129/79 (ТБ1323, TB1)	19NKH	36N	-
ТБ107/71 (ТБ1132, ТБ32)	24NKH	42N	-
ТБ103/70 (ТБ1032, ТБ52)	19NKH	42N	-
ТБ73/57 (ТБ0831, ТБ35)	24NKH	50N	-

Marking grades thermobimetallic consists of the letters TB and the subsequent two numbers, the first of which indicates the specific bend in °Cmultiplied by 10, and the second is electrical resistivity in Ohm·m, multiplied by 10. The coincidence of numbers in the designation of the nominal values of the specific bending and a specific electric resistance not necessarily.

1.3. The tape is manufactured in rolls, welded rolls or segments. Segments of the tape are manufactured with a length of 500−1200 mm.

The weld on the tape with a thickness of 0.3 mm and more celebrate with one side of the tape (for passive components), the ribbon thickness is less than 0.3 mm, the weld seam is marked with 01.01.95 city is allowed to remove defective welds. The mass of the welds is subtracted from the total mass of the metal.

Internal diameter of coil shall be not less than 400 mm for strip thickness 0,80 mm or more, not less than 250 mm — for tapes with a thickness of 0.41−0.80 mm and not less than 100 mm — tape thickness 0.40 mm or less. By agreement between manufacturer and consumer, the rolls of tape made with a different internal diameter.

1.4. Cold rolled strip is manufactured with a width (10−250) mm, thickness (of 0.1−2.0) mm thermostatic bimetallic brands 148/79 TB, TB 138/80, TB 129/79, 107/71 TB, TB 103/70, TB 73/57 and a thickness of (0,4−2,0) mm thermostatic bimetallic brands 200/113 TB, TB 160/122.

At the request of the consumer, a tape of the brands 200/113 TB and TB 160/122 produce a thickness of 0.4 mm or less.

The ribbon segments are made of thermostatic bimetallic thickness (0,1−2,5) mm incl., width (10−250) mm incl.

Strip width (10−60) mm are made with a gradation of 5 mm, a width (70−100) mm incl. with the graduation of 10 mm, a width more than 100 mm with a step of 20 mm.

In coordination with the consumer the strip of different width are manufactured according to GOST 503.

1.5. Tape dimensions and limit deviations of the thickness must comply with table.2. Gradation in thickness in accordance with GOST 503.

Table 2

mm
Thickness	Limit deviation
From 0.10 to 0.15 incl.	-0,015
SV. 0,15 «0,25 «	-0,02
«Of 0.25» to 0.40 «	-0,03
«0,40» 0,70 «	-0,04
«0,70» 0,95 «	-0,05
«0,95» 1,35 «	-0,06
«Of 1.35» to 1.75 «	-0,08
«To 1.75» 2,30 «	-0,10
«To 2.30» to 2.50 «	-0,12

By agreement between manufacturer and consumer tape is manufactured with a symmetrical limit deviations on thickness with preservation of tolerance.

1.2−1.5. (Changed edition, Rev. N 2).

1.6. Maximum deviations in width of edging tapes — ±0,5 mm; the edging must match table.3.

Table 3

mm
Width	Limit deviation
Up to 100 incl.	+5
From 100 «to 140 «	+7
SV. 140	+10

1.7. Longitudinal and transverse curvature of the tape should correspond to the table.4.

Table 4

mm
Class	The radius of longitudinal curvature of the tape thickness, not less			Radius of cross curvature tape having a thickness of less
From 0.2 to 0.28	0.3 to 0.5	SV. 0,5	From 0.2 to 0.28	0.3 to 0.5	SV. 0,5
I	-	400	-	-	300	-
II	200	200	250	150	150	Two hundred

Note. The longitudinal curvature along the length of the tape should be only one-sided.


Examples of symbols.

Tape from thermobimetallic brand TV 73/57 thickness of 0.5 mm, width 200 mm mill edge, grade II in the longitudinal and transverse curvature of the normalized curve of the specific class II and electrical resistivity.

Tape TB 73/57 — 0,5х200-PEP-AEP-GOST 10533−86.

Same brand TB 200/113 thickness of 1.0 mm, a width of 150 mm from cut edge of II class in the longitudinal and transverse curvature coefficient with a normalized sensitivity of the group B class II:

Tape TB 200/113 — 1,0х150-O-M-B-GOST 10533−86.

1.8. (Deleted, Rev. N 1).

2. TECHNICAL REQUIREMENTS

2.1. A thermostatic bimetallic strip must be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

2.2. The chemical composition of the alloys 75GND, 36N, 45NKH, 20NG, 42N, 50N, 19NKH, 24NKH should correspond to GOST 10994.

(Changed edition, Rev. N 2).

2.3. The tape is manufactured in cold-worked condition. The estimated cold deformation of 40−60%. At the request of the consumer tape is manufactured with a different cold deformation.

2.4. The tape surface should be clean, smooth, without grooves, captivity, cracks, fingerprints, flaws.

Allowed individual defects, not bringing the ribbon over the limit deviations on thickness, and color tint. On the ribbon, thermostatic bimetallic brands 200/113 TB, TB 160/122, TB 148/79 allowed the dark color of the surface-side active component.

At the request of the consumer, clarifying the characteristics of the tape surface is carried out according to reference standards agreed in the prescribed manner specifying the type and number of defects per unit area.

(Changed edition, Rev. N 2).

2.5. The surface roughness should be no more than 1,25 microns on a reference length of 0.8 mm.

2.6. Welding of layers of tape should be durable. The layers must be welded over the entire surface of contact.

2.7. On the edges of the cut tape are not allowed burrs in excess of the maximum deviations in thickness and other defects of sizes more than half of the limit deviations on width of the tape.

On the edges of the belt are allowed flaws, not bringing the tape beyond the minimum width.

2.8. The physical properties of the tape must conform to the standards table.5.

Table 5

Brand thermo bimetal	Specific bending			The sensitivity coefficient			Electrical resistivity
Nomin. A·10, °C	Pred. off % of classes		Nomin. M·10, °C	Pred. off % of classes		Nomin., Ohm·m 10	Pred. off %
I	II	I	II
TV 200/113
And	18,9	±5	±8	-	-	-	1,13	±5,0
B	19,7	±5	±8	-	-	-	1,13	±5,0
TB 160/122
And	14,1	±5	±7	-	-	-	1,22	±4,0
B	15,8	±5	±8	-	-	-	1,22	±4,0
TB 148/79	14,8	±5	±9	23,0	±5	±10	0,79	±4,0
TB 138/80	13,8	±5	±9	22,0	±5	±10	0,80	±5,0
TB 103/70	10,3	±5	±9	17,0	±5	±10	0,70	±5,0
TB 107/71	10,7	±5	±9	17,5	±5	±10	0,71	±4,0
TB 73/57	7,3	±5	±10	11,5	±5	±10	0,57	±4,5
TB 129/79	12,9	±5	±9	20,5	±5	±10	0,79	±5,0

Notes: 1. Limit deviations of the specific curve and sensitivity coefficient for the ribbon of the first class after the stabilizing heat treatment, while the nominal value should not be less than 3−5% and are set by agreement between manufacturer and consumer.

2. By agreement with the consumer allowed to make tape II class from grades 148/79 TB, TB 138/80, TB 103/70, 107/71 TB, TB 129/79 extreme deviations according to the specific bending strength of ±10%.

2.9. The variation of the specific bending brands 148/79 TB, TB 138/80, TB 129/79, 107/71 TB, TB 73/57 within one coil shall not exceed 10%.

2.8, 2.9. (Changed edition, Rev. N 2).

2.10. The physical properties of thermostatic bimetallic strips and components are given in annexes 1, 5.

Mode stabilizing heat treatment are given in Appendix 2.

3. ACCEPTANCE RULES

3.1. For thermostatic bimetallic strip brands 148/79 TB, TB 138/80, TB 129/79, 107/71 TB, TB 103/70, TB 73/57 party should consist of strips one conventional melting (active, passive and intermediate layers must be of the same trunks, respectively), single thickness. For thermostatic bimetallic brands 200/113 TB and TB 160/122 party may consist of one weld coil of one or more conditional heats.

The party must be issued a document about quality that contains:

the name of the manufacturer and trademark, or trademark;

the conditional number of melting, and for grades 200/113 TB and TB 160/122 — roll number;

brand thermobimetallic;

the nominal thickness;

the results of the tests.

(Changed edition, Rev. N 2).

3.2. To check the quality of the tape from the party is taken:

to check dimensions, surface finish and edges, longitudinal and transverse curvature of the weld strength is 100% of rolls (segments);

to check the specific bending, resistivity, variation of the specific bending within the same roll surface roughness is one roll (cut);

to test the sensitivity coefficient is one roll (cut) tape with a thickness of 0.3 mm.

3.3. The tape, obtained by cutting one coil at a predetermined width, check on one roll.

3.4. Control of the spread of specific bend in one roll and the surface roughness of the manufacturer conducts periodic, at least once a year.

3.5. The chemical composition of the components, the manufacturer tests for one sample from melting.

3.6. If unsatisfactory results of repeated tests are the churchyard 7566.

4. TEST METHODS

4.1. The chemical composition of the components of thermobimetals determined according to GOST 12344*-GOST 12348, 12350 GOST, GOST 12352, 12355 GOST, GOST 12356, 12357 GOST, GOST 28473 or other methods providing the required accuracy.
______________
* On the territory of the Russian Federation GOST 12344−2003. — Note the manufacturer’s database.

Sampling according to GOST 7565.

(Changed edition, Rev. N 2).

4.2. The thickness of the tape is checked with a micrometer (GOST 6507 or GOST 4381) or by other measurement means appropriate accuracy.

The width of the tape check a caliper according to GOST 166 or a metal line of the churchyard 427. The size of the tape roll check not less than one turn from the end of the roll, the thickness of the strip is checked at a distance of at least 5 mm from the edge.

4.3. The quality of the surface and the edges checked visually.

4.4. Surface roughness check the profilers, profiling, optical devices or work samples in accordance with GOST 2789.

4.5. The weld strength of the layers is checked visually by fracture of the sample tested on the Gib with a bend 180° until fracture in a vise with a radius of curvature of the jaws (3,0−5,0) mm. the Fracture of the tested specimen should not have a separation of the welded layers.

Check the weld strength of the layers produced on the two cross-sectional samples, taken one from each end of the roll or cut.

Sample width should be (10−15) mm, the thickness must match the thickness of the strip (but not more than 1 mm). For strips of thickness greater than 1 mm samples taken from a specially podchinennyh segments with a thickness of 0.3 mm.

4.6. The radius of longitudinal curvature is determined on the same sample length of at least 1.0 m from the roll (cut).

The radius of transverse curvature is determined on one transverse sample width is 50 mm.

To determine the longitudinal and transverse radii of curvature of the samples mounted on a flat surface, edge or cross-section respectively. The arc of the bend mark 3 dots and connect them by line segments. Through the middle of the segments to hold them perpendicular to the intersection.

For the longitudinal and transverse radius of curvature should be the arithmetic mean of the distances from the point of intersection of the perpendiculars to the marked points. Allowed tape according to the requirements of table.4 to define the template.

4.7. Specific bending test on three samples from the roll (cut), cut along the direction of rolling by the method of Annex 3 for the ribbon class I — on the samples after stabilizing heat treatment in accordance with Annex 2.

Samples should be wide (5,0−10,0) mm.

Gauge length of the specimen depending on the thickness and the nominal value of specific bending are given in table.6.

Table 6

The nominal value of the specific bending, ·10, °C	Gauge length of the specimen, mm thickness, mm
From 2.5 to 1.3 incl.	From 1.25 to 0.80 incl.	From 0.79 to 0.30
From 20 to 16 incl.	100±1,0	50100	2550
«15» 10 «	100±1,0	50−60
10 or less	100±1,0	50−100

4.8. The ratio of the sensitivity test on the three samples from the roll (cut) tape with a thickness of less than 0.3 mm by the method of Annex 4.

For strips of thickness greater than 0.3 mm samples taken from a specially podchinennyh segments of 0.3 mm thickness. Width of the sample should be (5,5±0,5) mm, the estimated length (200±1,0) mm.

4.9. Electrical resistivity determined on three samples from the roll (cut) according to GOST 12766.2.

4.10. Allowed the manufacturer to test specific bending specific electrical resistance and the weld strength on the sample thickness of 1 mm.

4.11. To determine the variation of the specific bending within the roll measure specific bending at the beginning and end of the roll and the difference between the value of specific bending refers to the average of the obtained values.

4.12. If there is disagreement on the value of the specific curve or sensitivity coefficient determination of these characteristics is carried out on the certified device of the manufacturer according to the method of application 3.

5. PACKING, MARKING, TRANSPORTATION AND STORAGE

5.1. Packing, marking, transportation and storage GOST 7566.

5.2. The tape is manufactured in coils or bundles of strands. The coil should consist of one or more lengths of not less than 1 m.

5.3. Rolls of tape with a thickness of less than 0.5 mm and packs should be wrapped in one or more layers of waterproof paper GOST 8828, GOST 10396 or other NTD and Packed tight in rows in boxes made according to GOST 2991 (boxes of types I or II) or other normative and technical documentation.

5.4. The rolls of tape with a thickness of 0.5 mm and wrapped in one or more layers of paper the churchyard 9569*, GOST 8828, GOST 10396 and film according to GOST 10354, GOST 16272 or other NTD or container holstoproshivny cloth GOST of 14,253, non-woven cloth, stitched the flap of waste textile industry or other types of packaging materials according to normative-technical documentation, with the exception of cotton and linen fabrics.
_______________
* On the territory of the Russian Federation GOST 9569−2006. — Note the manufacturer’s database.

Packed rolls must be tied with wire according to GOST 3282, OST 14.15.193 or other NTD or tape according to GOST 3560, GOST 6009 or other reference document or some other way to protect the packs from unwinding.

The outer diameter of the coil should be no more than 1200 mm, the inner is not less than 200 mm.

(Changed edition, Rev. N 2).

5.5. Weight of cargo must not exceed:

80 kg for manual loading;

1250 kg — with mechanical loading.

5.6. Transportation must be carried out by all types of transport in covered vehicles or containers in accordance with the rules of transportation effective for this transport, and the technical conditions of loading and fastening of cargoes, approved by the Ministry of Railways of the USSR.

5.7. The tape should be stored in a dry place at temperatures from minus 30 to plus 50 °C and relative humidity not more than 85% in the absence of air, alkaline and other aggressive impurities. Long-term storage (1 month or more) — according to GOST 15150, storage conditions 1L.

5.8. Transport package markings according to GOST 14192.

5.9. When shipping to the same user two or more places is consolidation packages dimensions according to GOST 24597, the means of fastening of package cargoes according to GOST 21650.

5.10. Allowed to apply tension industrial oils-20A and 40A churchyard 20799 inhibitors.

5.11. Tape from the passive layer should have a clear solid marking with paint or electrochemical method.

At the customer’s request the tape from thermobimetallic it is possible to produce without solid branding. In this case, the stigma is applied only at the ends of the strips and segments.

6. MANUFACTURER’S WARRANTY

6.1. The manufacturer guarantees the conformity of the thermostatic bimetallic strip to the requirements of this standard for chemical composition and physical properties under the conditions of storage.

A storage warranty period — 1.5 years from the date of manufacture.

ANNEX 1 (reference). THE PHYSICAL PROPERTIES OF THE THERMOSTATIC BIMETALLIC AND COMPONENTS

ANNEX 1
Reference

The properties of the components of the thermostatic bimetallic
active						passive
Brand Termoli- metal	Recommended when the wind blows tempera- cultural service interval of °C (heating without load)	The conference Lina Tempe temperature of heating, °C (no load)	Temperature coefficient of electro- resistance 10hail(20−200 °C)	Heat capacity, j/kg°C (20- 200 °C)	The module norm- heating, abut- guests , kN/mm	Udel- ing electro- support Tule- nie , µohm·m	The module will abut- guests , kN/mm	Heat capacity, j/kg°C (20- 200 °C)	Heat wire- ness , W/m°C	The raft- ness, g/cm	Solid ness	Specific electro- support tavlenie, µohm·m	The module will abut- guests , kN/mm	Heat capacity, j/kg°C (20- 200 °C)	Heat wire- ness , W/m°C (20- 200 °C)	The raft- ness, g/cm	Solid ness
200/113 TB (TB 2013)	From -60 to +200	250	7	528	135	1,72	125	543	8	7,55	200−260	0,79	150	510	16,3	8,12	210−230
160/122 TB (TB 1613)	«-60» +200	200	5	520	145	1,72	125	543	8	7,55	200−260	0,90	175	493	15,0	8,17	215−235
148/79 TB (TB 1523)	«-60» +200	450	10	520	162,5	0,78	175	485	15,8	8,14	230−240	0,79	150	510	16,3	8,12	210−230
TB 138/80 (TB 1423)	«-50» +200	450	11	505	170	0,83	190	490	14,6	8,12	260−280	0,79	150	510	16,3	8,12	210−230
TB 129/79 (TB 1323)	«-60» +200	450	11	500	172,5	0,80	195	490	15,5	8,04	260−280	0,79	150	510	16,3	8,12	210−230
TB 107/71 (TB 1132)	«-50» +320	450	16	500	177	0,83	190	490	14,6	8,12	280−290	0,60	155	497,5	16,7	8,14	210−220
TB 103/70 (TB 1032)	«-60» +320	450	16	500	175	0,80	195	490	15,5	8,04	280−290	0,60	155	497,5	16,7	8,14	210−220
TB 73/57 (TB 0831)	«-50» +400	450	22	490	178	0,83	190	490	14,6	8,12	280−290	0,48	163	472	20,4	8,23	240−250

ANNEX 2 (informative). MODE STABILIZING HEAT TREATMENT

ANNEX 2
Reference

Stabilizing heat treatment is carried out to eliminate residual stresses resulting from cold plastic deformation thermobimetallic tapes and machining of products (punching, bending, drilling, riveting, etc.).

After the stabilizing heat treatment increases the stability of the temperature-sensitive characteristics. The value of specific bending may be decreased by 3−5%.

Stabilizing heat treatment shall be done after all the machining operations. Temperature stabilization should be higher than the operating temperature of not less than 50 °C. the recommended temperature setting is shown in the table. The exposure time of the products in a furnace at a temperature of heat treatment should be not less than 1 h. the Temperature of the furnace during the unloading of the goods must not exceed 50 °C.

For better stabilization of the products is preferably carried out several repeated cycles of heat treatment.

Practiced in the factories termotransauto products in devices (nodes or devices) in the temperature range relevant to conditions of service (after which the final calibration of the instrument), may also be recommended as additional surgery.

Recommended temperature stabilizing heat treatment of the thermostatic bimetallic.

Brand thermobimetallic	Temperature stabilizing heat treatment, °C
TB 200/113	270±10
TB 160/122
TB 148/79	390±10
TB 138/80
TB 129/79
TB 107/71
TB 103/70
TB 73/57	410±10

ANNEXES 1, 2. (Changed edition, Rev. N 2).

APPENDIX 3 (obligatory). METHOD OF DETERMINATION OF SPECIFIC BENDING

APPENDIX 3
Mandatory

The specific curve is determined in a special installation by measuring the deflection of the sample, one end of which is fixed, and the second freely bent by heating it to a predetermined temperature. A setup to measure specific bending needs to consist of a clamping device, a heating device (thermostat), ensuring uniform sample heating with a temperature difference of not more than 3 °C, the device for measuring the deflection with an error of not more than 1% and thermometer with an accuracy of better than 1%. The test is carried out at a heating temperature (25±5), (100±10) °C. the dwell Time at (100±10) °C for at least 30 min.

The specific curve is calculated by the formula

,

where is the specific bend, °C;  — bending deflection, mm; is the actual thickness of specimen, mm, is determined as the arithmetic mean of at least three measurements;  — the difference between the final and initial temperature of test, °C;  — gauge length of the specimen, mm.

Gauge length of the specimen depends on the thickness and the nominal value of specific bending in accordance with the table.

Recommended width samples of 5−6 mm for a length of 60 mm or less; 8−10 mm for a length of 100 mm. the Measurement of specific bending on samples less than 0.3 mm is not recommended.

Recommended design length samples to measure specific bending

The nominal value of the specific bending ·10, °C	Thickness, mm
From 2.5 to 1.3	From 1.25 to 0.80	From 0.75 to 0.30
From 20 to 16 incl.	100±1	60±1	35±1
«15» 10 «	100±1	60±1
9.5 and less	100±1	100±1

ANNEX 4 (required). METHOD FOR THE DETERMINATION OF THE SENSITIVITY COEFFICIENT

ANNEX 4
Mandatory

The response factor is determined on a special installation by determining the angle of unwinding of the outer end of the spiral sample when it is heated.

As part of the installation to determine the sensitivity coefficient is composed of oil bath (thermostat), limb with divisions of 1°, clamping device, the control thermometer with a scale division of 1 °C.

The circumferential sample by using a mandrel with a diameter of 5−8 mm so that the passive layer was on the outer side of the spiral.

Test produce when heated (25±5) to (140±10) °C.

The sensitivity coefficient is calculated by the formula

,

where is the sensitivity coefficient, °C;  — the angle of unwinding, °;  — constant 3,14;actual sample thickness, mm;  — gauge length of the specimen, mm;  — the difference between the final and initial temperature of test, °C.

ANNEX 5 (reference). THE SPECIFIC CURVE OF THE THERMOSTATIC BIMETALLIC IN THE RECOMMENDED TEMPERATURE RANGE SERVICE

ANNEX 5
Reference

Brand thermobimetallic	Specific binding, ·10, °C, at temperatures, °C
From -60 to 20	From 20 to 120	From 20 to 200	From 20 to 300	From 20 to 400
TB 200/113 (2013)	17,7	19,8	19,0	-	-
TB 160/122 (ТБ1613)	14.4 V	15,7	15,2	-	-
TB 148/79 (ТБ1523)	14,1	15,0	14,7	-	-
TB 138/80 (ТБ1413)	13,2*	14,1	13,8	-	-
TB 129/79 (ТБ1323)	11,9	13,0	12,8	-	-
TB 107/71 (ТБ1132)	9,2*	10,8	11,0	11,2	9,5
TB 103/70 (1032)	9,1	10,3	10,3	10,6	8,3
TB 73/57 (TB 0831)	7,3*	8,1	8,4	8,9	8,9

* The value of specific bending is specified for the temperature range from -50 to +20 °C.