KUMHO KNB 2875 is a cold emulsion copolymer of acrylonitrile and butadiene. It has excellent resistance to hydrocarbon solvents, vegetable oils, acids, alkalis, and many other liquids and gases.
Resistance to abrasion, heat, water, and flexing are also provided by our NBR.
KUMHO KNB is suitable for injection molding of rubber products with various shapes, and it can be used with a relatively large amount of plasticizer.
KUMHO KNB is widely used for packings, gaskets, hoses, rolls, shoe soles and heels and other applications.
Product Application
|
Grade |
Packages |
Applications |
|
KNB 1845 |
35kg / Bale, 1.05 MT / Box |
Packings, Gaskets, Hoses, Rolls, Shoe soles and heels, Other applications requiring oil resistance |
|
KNB 25LM KNB 25M KNB 25LH KNB 25H KNB 2875 |
||
|
KNB 3345 KNB 35LL KNB 35L KNB 35LM KNB 35M KNB 35H KNB 0230 KNB 0230L |
||
|
KNB 40M KNB 40H |
Packings, Gaskets, Hoses, Rolls, Shoe soles and heels, Other applications requiring oil resistance, Low mould fouling |
|
|
KNB 3430G KNB 3445G |
Handling Precautions
Direct exposure to sunlight and humidity may cause discoloration or quality deterioration.
Keep the product away from direct sunlight, humidity and impurities, and store in a cool pl
Typical Properties Of Kumho Nbr
|
Grade Items |
KNB 1845 |
KNB 25LM |
KNB 25M |
KNB 25LH |
KNB 2875 |
KNB 25H |
KNB 3345 |
KNB 35LL |
KNB 35L |
KNB 35LM |
KNB 35M |
KNB 35H |
KNB 40M |
KNB 40H |
KNB 0230 |
KNB 0230L |
KNB 3430G |
KNB 3445G |
|
Bound AN (%) |
18 |
28 |
33 |
34 |
41 |
35 |
34 |
|||||||||||
|
Raw MV (ML1+4, 100℃) |
45 |
50 |
60 |
70 |
75 |
80 |
45 |
33 |
41 |
50 |
60 |
80 |
60 |
80 |
56 |
42 |
30 |
45 |
|
Specific Gravity |
0.93 |
0.96 |
0.97 |
0.98 |
1.00 |
0.98 |
0.98 |
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|
Compound Properties *1) Comp'd MV (ML1+4, 100℃) Rheometer (160℃, ARC±1°) ML (lbf ·in) MH (lbf ·in) Ts 1 (Min.) T' 50 (Min.) T' 90 (Min.) |
70 8.9 36.4 3.2 6.0 12.0 |
73 14.1 40.4 3.0 4.7 17.0 |
90 15.7 41.0 2.9 4.3 16.9 |
101 18.0 42.0 3.3 4.9 16.0 |
109 19.3 43.0 3.1 4.7 16.5 |
114 21.0 43.5 3.0 4.7 15.6 |
67 9.9 39.5 3.0 5.8 16.7 |
54 9.7 38.9 3.8 6.0 16.9 |
66 10.4 40.2 3.1 5.2 16.3 |
78 11.9 41.4 2.2 4.2 15.3 |
90 15.5 44.0 2.0 4.2 16.3 |
110 16.5 46.3 2.2 4.0 16.1 |
92 11.5 41.9 3.2 6.6 19.6 |
113 13.9 45.1 2.7 6.2 20.1 |
80 11.6 43.2 2.3 3.8 12.9 |
64 10.9 42.7 2.6 4.0 12.4 |
50 13.0 46.0 3.1 5.5 17.0 |
65 15.5 45.0 3.0 5.0 16.5 |
|
*2) 300% Modulus (kgf/cm2) Tensile Strength (kgf/cm2) Elongation (%) Hardness (Shore-A) ASTM #1 Oil Immersion Change *3) 300% Modulus (%) Tensile Strength (%) Elongation (%) Hardness (Change) Volume (%) |
110 240 500 70 |
140 275 510 73 23 -7 -20 -4 2 |
155 285 480 73 22 -8 -20 -4 2 |
168 285 440 73 24 -8 -23 -4 2 |
170 285 430 73 24 -9 -20 -3 3 |
175 285 400 73 24 -10 -18 -3 3 |
145 310 530 74 |
132 300 570 74 42 -8 -29 0 -1 |
141 310 550 74 35 -13 -28 0 0 |
148 313 530 74 39 -6 -23 0 0 |
153 327 520 74 40 -6 -21 -1 0 |
168 334 500 74 43 -4 -20 0 0 |
160 345 560 75 45 -1 -26 4 0 |
170 360 540 75 47 -1 -29 4 -1 |
160 300 500 74 40 -3 -25 -1 0 |
150 295 510 74 38 -3 -24 -1 0 |
125 290 520 73 |
135 320 550 73 |
*1) NBR 100, ZnO 3, S/A 1, HAF Black (IRB#8) 40, Accelerator TBBS 0.7, Sulfur 1.5 Total: 146.2
*2) 150℃×40 Min. Press Vulcanization
*3) 100℃×70hrs, Change Rate
*4) KNB Products-Nitrosamine Free
FAQ
Q: What are the differences between KNB35L and 3305E?
A: KNB35L has a lower Minitz value and is easier to process, making it suitable for extruding hoses; 3305E has higher strength and is mostly used for molding oil seals.
Q: In which products are they mainly applied?
A: Oil-resistant rubber hoses, O-rings, gaskets, automotive oil seals, mechanical sealing components, etc.
Q: Storage precautions?
A: Store in a cool, dry, and dark place, away from heat sources, and avoid the glue blocks from becoming sticky and aging.
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