GOST 21007-75

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  ГОСТ 21007-75

GOST 21007−75 platinum Wire for resistance thermometers. Specifications (with Amendments No. 1, 2, 3)

GOST 21007−75

Group В74

INTERSTATE STANDARD

PLATINUM WIRE FOR RESISTANCE THERMOMETERS

Specifications

Platinum wire for resistive temperature transducers. Specifications

ISS 77.150.99
GST 18 6590

Date of introduction 1976−01−01

The decision of the State standards Committee of the USSR Council of Ministers of 17 July 1975 N 1836 date of introduction is established 01.01.76

Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)

Instead 8588−64 GOST, GOST 5.1078−71

Change No. 3 Adopted by the Interstate Council for standardization, Metrology and certification (Protocol No. 12, 21.11.97)

The adoption of the changes voted:

The name of the state	The name of the national authority for standardization
The Republic Of Azerbaijan	Azgosstandart
The Republic Of Armenia	Armastajad
The Republic Of Belarus	Gosstandart Of Belarus
Kyrgyz Republic	Kyrgyzstandart
Russian Federation	Gosstandart Of Russia
The Republic Of Tajikistan	Tajikistandart
Turkmenistan	The main state inspection of Turkmenistan
The Republic Of Uzbekistan	Standards

This standard applies to the platinum wire of high purity, intended for the manufacture of sensitive elements of resistance thermometers and other industrial purposes.

(Changed edition, Rev. N 1).

1. ASSORTMENT

1.1. The diameter of the wire and limit deviation shall be as specified in table.1.

Table 1

mm

Nominal diameter of wire	Limit deviation	Nominal diameter of wire	Limit deviation
0,020	+0,002 -0,001	0,056	+ 0,003 -0,002
0,022	0,060
0,025	0,070
0,028	0,080
0,030	0,090
0,032	+0,003 -0,002	0,10	-0,008
0,036	0,11
0,040	0,12
0,045	0,14
0,050	0,15
0,16	-0,008	Of 1.00	-0,020
0,18	1,10
0,20	1,20
0,22	1,50
0,25	1,60
0,28	1,80
0,30	Of 2.00
0,32	-0,015	2,20
0,36	2,50
0,40	2,80
0,45	Of 3.00
0,50
0,56
0,60
0,63	-0,018	3,20	-0,025
0,70	3,60
0,80	Of 4.00
0,90	4,50
5,00
6,00

Notes:

1. For the technically coherent to the customer’s requirement wire diameter 0.020 mm produce a maximum deviation of ±0.001 mm.

2. Wire grade PL4 manufactured with a diameter of not less than 0.030 mm.


(Changed edition, Rev. N 1, 2).

1.2. The roundness of the wire must not exceed half of the maximum deviations in diameter.

Examples of symbols:

Platinum wire brand PL1, soft (annealed), with a diameter of 0.5 mm:

Wire Пл1М 0,5 GOST 21007−75

Same brand PL2-A, solid (Nagarjuna), with a diameter of 0.08 mm:

Wire PL2-at 0,08 GOST 21007−75

(Changed edition, Rev. N 1).

2. TECHNICAL REQUIREMENTS

2.1. Wire shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

Depending on the value set brand: platinum Pl0, PL1, PL2, PL2-A, Pl3, PL4.

2.2. The value must conform to the requirements of table.2.

Table 2

Mark	The value				The diameter of the produced wire, mm
Pl0	SV.	1,3925	0,05
PL1	"	1,3920	to	1,3925	0,05
PL2-A	"	To 1.3910	"	1,3920	0,03
PL2	"	1,3900	"	1,3920	0,02
Pl3	"	The 1.3880	"	1,3900	0,02
PL4	"	1,3830	"	Of 1.3850	0,03

Note.  — the relative resistance of wire samples, respectively at 100 °C and 0 °C, annealed at 800 °C — 850 °C in air for 30−60 min.

2.1, 2.2. (Changed edition, Rev. N 1, 2).

2.3. Wire produced with a diameter less than 0.04 mm — solid (hard), with a diameter of 0.04 mm and more — soft (annealed) and hard (work-hardened).

(Changed edition, Rev. N 2).

2.4. The surface of the wire should not have prisoner of cracks, cavities, delamination. Allowed individual surface damage, do not strip wire at reference sweep for tolerances for diameter, as well as local darkening and waviness annealed wire.

(Changed edition, Rev. N 1, 2).

2.5. Weight of wire on coil (on the roll) must meet the requirements specified in table.3.

Table 3

Wire diameter, mm				Weight of wire per reel (reel), g, not less
normal	reduced
From	0,020	to	0,025	0,6	0,3
SV.	0,025	"	0,030	1,0	0,5
«	0,030	»	0,050	3,0	1,5
«	0,050	»	0,10	6,0	3,2
«	0,10	»	0,16	13,0	5,5
«	0,16	»	0,30	25,0	10,0
«	0,30	»	Of 1.00	55,0	25,0
«	Of 1.00	»	Of 2.00	150,0	75,0
«	Of 2.00	»	6,00	300,0	150,0

Notes:

1. The number of coils (coils) low mass may be no more than 15% of the batch weight.

2. At the request of the consumer allowed the coil (coils) of wire the larger mass.


(Changed edition, Rev. N 1).

2.6. Theoretical weight of 1 m length of wire made of platinum and physico-mechanical properties are specified in appendices 1 and 2.

2.7. Wire diameter of 0.3 mm or less is wound on tared plastic, oxidized or anodized aluminum coil; wire diameter over 0.3 mm, in coils.

(Added, Rev. N 1).

2.8. The wire should be wound on a reel or folded into coils providing free winding rows without sharp bends.

Each coil (a coil) should consist of a single segment of wire with no splices and knots. The ends of the wire on the coils should be firmly fixed. Each coil of wire with a diameter of 2 mm needs to be fixed ends of the wire in the same bundle. Allowed to bind the coils of wire in the Bay.

(Changed edition, Rev. N 1, 2, 3).

3. ACCEPTANCE RULES

3.1. Wire take parties. The party should consist of wire of the same diameter, one state, one brand and feature a document about quality that contains:

trademark or the name and trademark of manufacturer;

symbol wire;

part number (fusion);

the number of coils (skeins);

value ;

the mass of wire in grams;

the date of issue;

stamp of technical control.

(Changed edition, Rev. N 1, 3).

3.2. To check the appearance, diameter and mass is performed on each reel (reel) of wire.

3.3. To determine the value of the party take 5% of coils (coils) of wire, but not less than two.

Note. Determination of the values for wire diameter greater than 0.5 mm is carried out on samples with a diameter of 0.5 mm.

3.4. If unsatisfactory indicator thereon, a second test of the doubled sample taken from the same batch. Upon receipt of unsatisfactory results, re-testing the test is subjected to each coil (a coil) of the party.

3.2−3.4. (Changed edition, Rev. N 1).

4. TEST METHODS

4.1. The wire diameter and ovality measured in three places at a minimum distance of 100 mm from each other in two mutually perpendicular directions in each measured section of the spring measuring heads according to GOST 28798−90 for wire diameter less than 0.2 mm and a micrometer type МК25−1 according to GOST 6507−90 for a wire diameter of 0.2 mm or more or other devices, providing the required accuracy.

If there is disagreement in the assessment of the size of the measured spring contact heads according to GOST 28798−90 for wire diameter less than 0.2 mm and a micrometer type МК25−1 according to GOST 6507−90 for wire diameter 0,2 mm and more.

Ground wire check on laboratory scales General purpose accuracy class 3 according to GOST 24104−88*.
_______________
* From 1 July 2002 was put into effect GOST 24104−2001.


(Changed edition, Rev. N 1, 2, 3).

4.2. The value is determined according to GOST 8.461−82.

(Changed edition, Rev. N 1).

4.3. Check the surface of the wire 0.1 mm in diameter and less must be made under a binocular microscope at 16 x magnification, with a diameter of more than 0.1 mm without the use of magnifying devices.

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. (Deleted, Rev. N 1).

5.2. On the sides of the coil should be marked with a number and the mass of the coil.

5.3. On each reel (reel) wire, attach the label, which must include:

trademark or the name and trademark of manufacturer;

symbol wire;

part number (fusion).

(Changed edition, Rev. N 1).

5.4. Coil Packed in plastic or cardboard boxes, and rolls of barbed wire, wrapped in paper according to GOST 8273−75, must be Packed in solid wooden boxes according to GOST 18617−83.

Weight of cargo must not exceed 20 kg.

Allowed to another way and packing material in wooden boxes, ensure quality safety of products.

(Changed edition, Rev. N 1, 2).

5.5. Marking boxes are produced according to GOST 14192−96.

5.6, 5.7. (Deleted, Rev. N 1).

5.8. Working with wire should be carried out under conditions that exclude contamination of the surface (such as other metals, refractories, graphite, organic compounds, etc.). If the annealed wire in the process, had been subjected to even a slight deformation (bending, winding-rewinding, etc.), the value may decrease.

For value recovery needs to be performed the annealing parts made from wire, at a temperature of 800°C-850°C for 30−60 min.

5.9. Storage, transportation and accounting of wire of platinum must be conducted in accordance with the order of storage, transportation and accounting of precious metals. Storage conditions in terms of the impact of climatic factors — according to GOST 15150−69, group 3 (G).

(Changed edition, Rev. N 1).

6. MANUFACTURER’S WARRANTY

The manufacturer guarantees the conformity of a wire of platinum to the requirements of this standard when complying with the storage conditions prescribed by the standard.

Guaranteed storage life of wire — 15 years from date of manufacture.

Sec. 6. (Added, Rev. N 2).

ANNEX 1 (reference). THEORETICAL WEIGHT of 1 m LENGTH of WIRE made of PLATINUM

ANNEX 1
Reference

Wire diameter, mm	The cross-sectional area, mm	Theoretical weight, g
0,020	0,000314	0,00674
0,022	0,000380	0,00815
0,025	0,000490	0,01051
0,028	0,000615	0,01319
0,030	0,000706	0,01514
0,032	0,000804	0,01725
0,036	0,001017	0,02182
0,040	0,001256	0,02694
0,045	0,001590	0,03411
0,050	0,001963	0,04211
0,056	0,002463	0,05283
0,060	0,002827	0,06064
0,070	0,003848	0,08254
0,080	0,005026	0,10781
0,090	0,006361	0,13644
0,10	0,00785	0,1684
0,11	0,00950	0,2038
0,12	0,01131	0,2426
0,14	0,01539	0,3302
0,15	0,01767	0,3790
0,16	0,02011	0,4313
0,18	0,02545	0,5458
0,20	0,03142	0,6739
0,22	0,03801	0,8154
0,25	0,04909	1,0529
0,28	0,06157	1,3208
0,30	0,07068	1,5162
0,32	0,08042	1,7251
0,36	0,1079	1,1833
0,40	0,12566	2,6954
0,45	0,1590	3,411
0,50	0,1963	4,212
0,56	0,2463	5,283
0,60	0,2827	6,065
0,63	0,3117	6,686
0,70	0,3848	8,255
0,80	0,5026	10,782
0,90	0,6362	13,646
Of 1.00	0,7854	16,846
1,10	0,9503	20,384
1,20	1,1309	24,259
1,50	1,7671	37,905
1,60	2,0106	43,127
1,80	2,5446	54,583
Of 2.00	3,1415	67,386
2,20	3,801	81,53
2,50	4,909	105,29
2,80	6,157	132,08
Of 3.00	7,068	151,62
3,20	8,042	172,51
3,60	10,179	218,33
Of 4.00	12,566	269,54
4,50	15,904	341,14
5,00	19,635	421,16
6,00	28,274	606,47

ANNEX 2 (informative). PHYSICO-MECHANICAL PROPERTIES OF THE WIRE MADE OF PLATINUM

ANNEX 2
Reference

Rupture strength, MPa (kgf/mm), wire		Specific electric resistance of wire, Ω·mm/m at 20 °C
soft	solid
118−196 (12−20)	At least 245 (25)	0,11

Note. Rupture strength was determined by wire diameter from 0,20 to 0,50 mm.


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