BUR-A-LOY and ProFlex

Engineered Nitrile/PVC elastomers incorporating non-staining stabilizer systems.
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Engineered Nitrile/PVC elastomers

ProFlex MB and Bur-A-Loy are HEXPOL’s line of engineered Nitrile/PVC elastomers. Both are produced in ISO 9001 registered facilities, and are fluxed blends incorporating non-staining stabilizer systems. These products do not contain fillers or curatives but some grades do contain plasticizers. NBR and PVC, when fluxed, retain the advantages of both polymers.

BUR-A-LOY and ProFlex logo

Fluxed Polymer Blend

A fluxed polymer blend is more than just a dispersion of two polymers.  Fluxing actually dissolves the PVC resin into the melted Nitrile polymer. At too low a mixing temperature, no solution is created and properties suffer.  At too high a mixing temperature, polymer degradation occurs and properties suffer. Degradation can be auto-catalytic and exothermic to the point that the batch can release chlorine gas and catch fire, leading to employee hazards and equipment damage.  Degradation may occur in the fluxing stage.  In the cure-addition stage, temperatures need not be at a level that could lead to degradation.

When fluxed, the PVC imparts ozone resistance to the NBR, while the nitrile increases the flexibility of the PVC. The resultant blends have good oil and fuel resistance, abrasion and flex resistance.

Blend Ratio

The most common ratio of NBR to PVC is 70/30, with higher PVC contents used in sponge applications. Plasticizer extended grades are also available. Blends with more than 70% NBR tend to lose the economic and property benefits of PVC.  Blends with less than 50% NBR tend to be rubber-modified thermoplastics. 

Typical applications include hose & tubing, footwear, wire & cable, belting and coated fabrics.

Mixing

ProFlex MB and Bur-A-Loy NBR/PVCs enable customers to streamline their mixing processes to meet virtually any performance requirement.  Processing of ProFlex MB in its slab form (versus bales of nitrile rubber and PVC powder) is considerably improved with the polymer ready to incorporate fillers, oils, and curatives by mill or internal mixing.

All ProFlex and Bur-A-Loy grades are appropriate for mill and internal mixing.  The products have a predicted 2-year shelf-life when stored in a dry location at temperatures below 90F.

Advantages And Benefits​

Feature
Advantages
Benefits
Pre-Fluxed Polymers
Versus
Fluxing Dry Polymers
  • Simplified mixing
  • Avoid burned batches
  • Improved housekeeping
  • Reduced “Fly Loss”
  • Enhanced employee safety
  • Improved equipment life
  • Reduced mix costs
  • Reduced operating costs
  • Improved product quality
Unique Product Performance
Versus
Other Polymer Types
  • Performance advantages of NBR with ozone resistance and mechanical advantages of PVC.
  • Competitive offset to CR rubber.
    • Lower specific gravity
    • Similar performance
    • Lower price
  • Improved abrasion resistance
  • Improved performance when compared to NBR
  • Ideal alternative to CR in many applications
  • Material of choice for many hose and belting applications
HEXPOL
Versus
Other Pre-Fluxed Brands
  • Multi-plant and warehouse network
  • Easy weigh packaging
  • Spectrum® process control and lot trace ability.
  • Over 20 years’ experience manufacturing NBR/PVC fluxed polymer blends
  • All facilities ISO registered
  • Open-pallet packaging reduces handling and scrap disposal.
  • Security of supply
  • Consistency of product quality and service

NBR/PVC Cross-Reference​

ProFlex and BUR-A-LOY are Hexpol’s trademarks for its brands of engineered elastomers. All ProFlex and BUR-A-LOY property data represents typical values and is not for specification purposes.

ProFlex MB / BUR-A-LOY Grades
Ratio NBR To PVC
Bound ACN Level
ML 1+4 @ 100ºC
Formulation: Fluxed Polymer with Stabilizers
Tensile PSI
Elongation %
Durometer Shore A
Description and/or General Applications
NV850
50:50
33%
55
Unplasticized
50:50
33%
60
Unplasticized
BAL 5915
50:50
33%
66 (MS)
Plasticized 15 PHR DOP
2100
555
74
Thermoset or thermoplastic polymer. Heels, soles, mats, and consumer goods where oil, abrasion, and ozone resistance is required.
NV847/60
50:50
34%
65
Plasticized 100 PHR DOP
60:40
33%
53 (MS)
Unplasticized
NV866/20
60:40
33%
20
Plasticized 70 PHR DOP
500
500
32
Highly plasticized. Soft Roll and printing blanket stocks. Excellent PVC dispersion and end-processing.
BAL 3873
60:40
33%
20
Plasticized 70 PHR DOP
925
800
41
Highly plasticized. Soft Roll and printing blanket stocks. Excellent PVC dispersion and end-processing.
70:30
23%
67
Unplasticized
70:30
26%
65
XNBR Polymer, Unplasticized
NT/VC8838
70:30
28%
60
Unplasticized
70:30
28%
63
Unplasticized
70:30
28%
68
Unplasticized
NT/VC2870
70:30
28%
75
Unplasticized
1300
400
63
70:30
30%
50
Unplasticized
70:30
30%
55
Unplasticized
70:30
30%
60
Unplasticized
70:30
30%
65
Unplasticized
70:30
30%
75
Unplasticized
BAL 7007
70:30
33%
55
Unplasticized
2500
700
80
Simlar to BAL 7001 but lower Mooney
70:30
33%
62
Unplasticized
NT/VC3470
70:30
33%
65
Unplasticized
General purpose. Wire and cable, hose, bledting, sponge and molded good. Blends well with other polymers, such as SBR, for better economy.
BAL 7001
70:30
33%
65
Unplasticized
3000
600
80
General purpose. Wire and cable, hose, bledting, sponge and molded good. Blends well with other polymers, such as SBR, for better economy.
70:30
33%
72
Unplasticized
NV870
70:30
33%
75
Unplasticized
2100
500
60
Similar to NT/VC3470 and BAL 7001 but higher Mooney
BAL 7009
70:30
33%
75
Unplasticized
3000
600
80
Similar to NT/VC3470 and BAL 7001 but higher Mooney
BAL XVN-2
70:30
37%
Unplasticized
1600
400
57
70:30
38%
45 (MS)
Unplasticized
70:30
39%
51 (MS)
Unplasticized
70:30
39%
75
Unplasticized
70:30
45%
55 (MS)
Unplasticized
BAL 7130
70:30
51%
35
Plasticized 30 DOP
1700
290
83
Plasticized, high ACN polymer. Hose, oil seals, And general molded and extruded goods. Excellent oil and fuel resistance.

Contact us to discuss BUR-A-LOY And ProFlex

Gary Moore

Gary Moore

Advanced Rubber & High Performance Compounding, Americas

gary.moore@hexpol.com
+1 682 215 7096

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