Product Index

3M CTI Index : The Comparative Tracking Index (CTI)  3M膠帶 CTI 相對漏電起痕指數

UL revised the requirements and references for Material Group Classifications after 2008, eliminating the Material Group IIIb rating. The current notes regarding CTI Material Groups state the following in the Online Certifications Directory:

Material Groups are identified in UL
1950, Section 2.9:

(a) Material Group I

600 </= CTI

(b) Material Group II

400 </= CTI < 600

(c) Material Group IIIa

175 </= CTI < 400

(d) Material Group IIIb

100 </= CTI < 175

 The Comparative Tracking Index (CTI) is the maximum voltage, measured in volts, at which a material withstands 50 drops of contaminated water without tracking. Tracking is defined as the formation of conductive paths due to electrical stress, humidity, and contamination.

(a) Material Group I

May be marked “Comparative Tracking Index (CTI) equal to or greater than 600V, PLC=0, UL840 Material Group I, when tested to IEC60112 on both sides of tape.

(b) Material Group II

May be marked “Comparative Tracking Index (CTI) ) equal to or greater than 400V but less than 600V, PLC=1, UL840 Material Group II, when tested to IEC60112 on both sides

of tape.

(c) Material Group IIIa

May be marked “Comparative Tracking Index (CTI) equal to or greater than 175V but less than 400V, PLC=2 or 3, UL840 Material Group IIIa, when tested to IEC60112 on both sides of tape.

(d) Material Group IIIa

May be marked “Comparative Tracking Index (CTI) 325(275) on Adhesive side, UL840, Material Group IIIa and/or CTI 225 on Film Side, Material Group IIIa or equivalent when tested to IEC60112, 4th Edition (2003).

UL Standard 840

Standard for Insulation Coordination Including Clearances and Creepage Distances for Electrical Equipment. UL 746A is referenced in UL840.

UL Standard 746A

Standard for Polymeric Materials - Short Term Property Evaluations.

 

3M Tape CTI Value Material
Group (3M)		 Material
Group (UL)
1 600 　 I
5 600 I 　
Super 10 600 　 I
11 600 I 　
12 600 I 　
16 600 I 　
Super 20 600 　 I
27 600 　 I
28 600 　 I
44 600 　 I
44D 600 　 I
44T-A 600 　 I
46 475 II 　
54 600 　 I
55 600 I 　
56 600 　 I
57 600 　 I
58 600 　 I
60 600 I 　
61 600 I 　
62 600 I 　
63 600 I 　
69 600 　 I
74 600 　 I
75 600 I 　
79 600 I 　
90 600 I 　
92 150 IIIb 　
MR94 600 I 　
MR94B 　 　 IIIa
1205 125 IIIb 　
1276 600 I 　
1291 600 I 　
1298 　 　 II
1312 600 　 I
1318B-1 200 IIIa 　
1318B-2 200 IIIa 　
1318W-1 450 II 　
1318W-2 450 II 　
1318Y-1 　 　 I
1318Y-2 600 　 I
44HT 600 I I
1318 Clear 600 　 I
1318-MW 600 　 I
1339 600 I 　
1350B-1 　 　 IIIa
1350B-2 　 　 IIIa
1350W-1 　 　 IIIa
1350W-2 　 　 IIIa
1350Y-1 　 　 II
1350Y-2 　 　 IIIa
1350F-B-1 　 　 IIIa
1350F-B-2 　 　 IIIa
1350F-W-1 　 　 IIIa
1350F-W-2 　 　 IIIa
1350F-Y-1 　 　 II
1350F-Y-2 　 　 IIIa
1350T-1 　 　 II
1351T-1 600 　 I
1351-1 600 　 I
1351-2 600 　 I
1554 600 I 　
1098-1 550 　 II
1098 Black 600 　 I

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

中央商業有限公司 Power Hub Inc.