| ISO3302 |
| Reference Dimension | M1 Grade | M2 Grade | M3 Grade | M4 Grade |
| Over | To(inculde) | F | C | F | C | F | C | F | C |
| 0 | 4.0 | ±0.08 | ±0.10 | ±0.10 | ±0.15 | ±0.25 | ±0.40 | ±0.50 |
| 4 | 6.3 | ±0.10 | ±0.12 | ±0.15 | ±0.20 | ±0.25 | ±0.40 | ±0.50 |
| 6.3 | 10 | ±0.10 | ±0.15 | ±0.20 | ±0.20 | ±0.30 | ±0.50 | ±0.70 |
| 10 | 16 | ±0.15 | ±0.20 | ±0.20 | ±0.25 | ±0.40 | ±0.60 | ±0.80 |
| 16 | 25 | ±0.20 | ±0.20 | ±0.25 | ±0.35 | ±0.50 | ±0.80 | ±1.00 |
| 25 | 40 | ±0.20 | ±0.25 | ±0.35 | ±0.40 | ±0.60 | ±1.00 | ±1.30 |
| 40 | 63 | ±0.25 | ±0.35 | ±0.40 | ±0.50 | ±0.80 | ±1.30 | ±1.60 |
| 63 | 100 | ±0.35 | ±0.40 | ±0.50 | ±0.70 | ±1.00 | ±1.60 | ±2.0 |
| 100 | 160 | ±0.40 | ±0.50 | ±0.70 | ±0.80 | ±1.30 | ±2.0 | ±2.5 |
| 160 | — | ±0.3% | ±0.4% | ±0.5% | ±0.7% | ±0.8% | ±1.3% | ±1.5% |
| DIN7715 |
| Basic Size | M1 Grade | M2 Grade | M3 Grade | M4 Grade |
| Over | To(inculde) | F± | C± | F± | C± | F± | C± | F± | C± |
| 0 | 6.3 | 0.10 | 0.10 | 0.15 | 0.25 | 0.25 | 0.40 | 0.50 | 0.50 |
| 6.3 | 10 | 0.10 | 0.15 | 0.20 | 0.20 | 0.30 | 0.50 | 0.70 | 0.70 |
| 10 | 16 | 0.15 | 0.20 | 0.20 | 0.25 | 0.40 | 0.60 | 0.80 | 0.80 |
| 16 | 25 | 0.20 | 0.20 | 0.25 | 0.35 | 0.50 | 0.80 | 1.00 | 1.00 |
| 25 | 40 | 0.20 | 0.25 | 0.35 | 0.40 | 0.60 | 1.00 | 1.30 | 1.30 |
| 40 | 63 | 0.25 | 0.35 | 0.40 | 0.50 | 0.80 | 1.30 | 1.60 | 1.60 |
| 63 | 100 | 0.35 | 0.40 | 0.50 | 0.70 | 1.00 | 1.60 | 2.00 | 2.00 |
| 100 | 160 | 0.40 | 0.50 | 0.70 | 0.80 | 1.30 | 2.00 | 2.50 | 2.50 |
| >160 | | *0.003 | *0.005 | *0.008 | *0.015 |
| RMA |
| Basic Size | A1 Grade | A2 Grade | A3 Grade | A4 Grade |
| Over | To(inculde) | F± | C± | F± | C± | F± | C± | F± | C± |
| 0 | 10 | 0.10 | 0.13 | 0.16 | 0.20 | 0.20 | 0.32 | 0.32 | 0.80 |
| 10 | 16 | 0.13 | 0.16 | 0.20 | 0.25 | 0.25 | 0.40 | 0.40 | 0.80 |
| 16 | 25 | 0.16 | 0.20 | 0.25 | 0.32 | 0.32 | 0.50 | 0.50 | 1.00 |
| 25 | 40 | 0.20 | 0.25 | 0.32 | 0.40 | 0.40 | 0.63 | 0.63 | 1.12 |
| 40 | 63 | 0.25 | 0.32 | 0.40 | 0.50 | 0.50 | 0.80 | 0.80 | 1.25 |
| 63 | 100 | 0.32 | 0.40 | 0.50 | 0.63 | 0.63 | 1.00 | 1.00 | 1.40 |
| 100 | 160 | 0.40 | 0.50 | 0.63 | 0.80 | 0.80 | 1.25 | 1.25 | 1.60 |
| 160 | | | | *0.004 | *0.005 | *0.005 | *0.008 | *0.008 | *0.01 |
Testing Ability Of Kingtom Lab
| No. | Test | Testing equipment |
| 1 | Tensile stress test | Computer controlled tensile machine |
| 2 | Tear strength test | Computer controlled tensile machine |
| 3 | 90°Peel strength test | Computer controlled tensile machine |
| 4 | 180°Peel strength test | Computer controlled tensile machine |
| 5 | Aging test | Aging test chamber |
| 6 | Liquid resistance test | Constant temperature oil tank |
| 7 | Permanent compression test | Compression tooling |
| 8 | Withstand voltage test | High voltage transformer |
| 9 | Ozone resistance test | Ozone aging chamber |
| 10 | Density test | Precision electron hydrometer |
| 11 | Ash content test | Precision electronic balance |
| 12 | Heat losing test | Constant temperature chamber |
| 13 | Melting point test | Melting point instrument |
| 14 | Carbon black dispersion test | Carbon Black Dispersion Tester |
| 15 | Abrasion resistance test | Roller abrasion testing machine |
| 16 | Impact test | Rubber impact testing machine |
| 17 | Fatigue crack test | Rubber fatigue testing machine |
| 18 | Fogging test | Fogging tester |
| 19 | Static rigidity test | Universal tension testing machine |
| 20 | High-low temperature test | High-low temperature cycles tester |
| 21 | Vulcanization curve test | None-rotor rheometer |
| 22 | Mooney viscosity test | Mooney viscometer |
| 23 | Open flash point | Cleveland open flash tester |
| 24 | Softening point | Asphalt softening point tester |
| 25 | Volume resistance test | Volume surface resistivity meter |
| 26 | Surface resistance test | Volume surface resistivity meter |
| 27 | Volume resistivity test | Volume surface resistivity meter |
Why US
*Since 1996 in the rubber &plastic industry
*Obtain ISO9001:2000,ISO/TS16949:2008,ISO14001,IATF16949 certificate.
*Kingtom has its own advanced testing center and a strong technical team. Each year, Kingtom invest more than 3.5% of our revenue in R&D
*25 engineers are engaged in R&D activites
*Kingtom has obtained 38 national patents
*Kingtom has the ability to develop various rubber materials formula such as EPDM, NR, NBR, SBR, FKM, ECO etc as customers’ requirement.
*The maximum size of rubber product we can make is 2M*2.2M
*Kingtom has a good cooperation relationship with some famous third-party organization like SGS,CTI and so on.This will help us to expand test scope.
*Best Factory and small MOQ
*Kingtom participated in the formulation of national automotive lighting industry rubber parts standard.
*Kingtom cooperate with many world-class material brands such as Lanxess, Mitsui, Kumho, SK chemical.
*Kingtom is the certified rubber product supplier by HONG KONG JOCKEY CLUB.We provide full range of rubber technology solutions for world racecourses.
*More than 100sets manufacturing facilities,fast delivery time.
