Zhejiang Cenway Materials develops and produces High Molecular Weight Polyisobutylene (HB series) and Medium Molecular Weight Polyisobutylene (MB series) for roofing, sealants, lubricants, medical and consumer industries worldwide.
Two core families of polyisobutylene
We supply both High Molecular Weight PIB (rubbery solid, Mv >100,000) and Medium Molecular Weight PIB (viscous / semi-solid, Mv 10,000–100,000).
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![High Molecular Weight Polyisobutylene]()
High Molecular Weight PolyisobutyleneDescription The high molecular weight polyisobutylene is a solid rubberlike substance and appears as a transparent non-drying synthet
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![Medium Moleculare Weight Polyisobutylene]()
Medium Moleculare Weight PolyisobutyleneMedium Moleculare Weight Polyisobutylene Medium molecular weight polyisobutylen (PIB) is a synthetic hydrocarbon. It is formed by pol
A PIB specialist you can build supply on
From cationic polymerization to finished pellets, Cenway controls the full process so you get consistent molecular weight, purity and documentation.
Vertically integrated plant
Own polymerization, devolatilization and pelletizing lines in Jiaxing and Panjin - full grades of HMW PIB and pharmaceutical-grade butyl rubber.
Tight MW control
Viscosity and Mn distribution are monitored lot-by-lot, so HB-50/80/100 and MB-10/12/15 hit your formulation window every time.
Low volatiles & purity
Low hexane residue and near-odour-free material suitable for insulated glass, transdermal and food-contact gum base.
Stable, scalable supply
Backed by Tsinghua Industrial Development Research Institute incubation and 100+ patents for dependable, large-volume delivery.
Application engineering
Technical team helps tune grade, blending and processing for roofing, adhesives, lubricants and medical use.
Docs & samples on request
COA, SDS, TDS and free samples provided fast, with FOB/CIF quotes and multi-language support.
Grade specification table
Typical values for reference. Exact COA is supplied per lot. Custom molecular weight and formulation available on request.
| Grade | Family | Molecular Weight (Mv) | Form | Volatility | Ash | Key Application |
|---|---|---|---|---|---|---|
| HB-100 | HMW | ≈ 100,000 | Solid, transparent | ≤ 0.30% | ≤ 0.05% | Transdermal patches, roofing membrane, adhesive |
| HB-80 | HMW | ≈ 80,000 | Solid, rubbery | ≤ 0.30% | ≤ 0.05% | Roofing membrane, protective film |
| HB-50 | HMW | ≈ 50,000 | Semi-solid | ≤ 0.40% | ≤ 0.10% | Wax modification, adhesive |
| MB-15 | MMW | ≈ 15,000 | Viscous / semi-solid | ≤ 0.50% | ≤ 0.10% | Protective film, lubricant additive |
| MB-12 | MMW | ≈ 12,000 | Semi-solid | ≤ 0.50% | ≤ 0.10% | Chewing gum base |
| MB-10 | MMW | ≈ 10,000 | Viscous | ≤ 0.50% | ≤ 0.10% | Insulated glass & construction sealant |
Industry solutions, grade by grade
We match the right PIB grade to your process and performance target.
Construction & Waterproofing
MMW PIB (MB-10) delivers the low-temperature flexibility and argon/water barrier needed for dual-seal insulating glass and pre-applied waterproofing membranes.
- Low gas & moisture permeability
- Stable at −50 °C
- Easy hot-melt metering
Adhesives & Sealants
HMW PIB (HB-50/80/100) provides cohesive strength and permanent tack for butyl tapes, laminating adhesives and caulks.
- High cohesion & peel
- UV & ozone resistance
- Near odour-free
Medical & Personal Care
Pharma-grade HB-100 is used in transdermal drug-delivery adhesives where skin-friendly tack and purity matter.
- Low extractables
- Consistent MW
- SDS / TDS supplied
Lubricants & Energy
MMW PIB (MB-15) acts as a viscosity index improver and tackifier in greases and industrial lubricants.
- Shear-stable thickening
- Oxidation resistant
- Compatible blending
From monomer to finished PIB
A controlled cationic polymerization route with full in-house quality control.
Feedstock intake
Isobutylene storage and purification under closed handling.
Cationic polymerization
Lewis-acid catalyst builds the PIB chain at controlled MW.
Devolatilization
Flash stripping lowers residual monomer and volatiles.
Extrusion & forming
Pelletizing or sheeting into grade-specific product form.
QC & lab test
MW, volatility, ash and colour checked lot-by-lot.
Pack & warehouse
Sealed, labelled and stored for export-ready dispatch.
Certified & audited
Official certification and third-party audits back every shipment.
High vs. Medium Molecular Weight PIB
Choosing the right family depends on the form and performance your process needs.
| Attribute | High Molecular Weight PIB | Medium Molecular Weight PIB |
|---|---|---|
| Molecular weight (Mv) | > 100,000 | 10,000 – 100,000 |
| Physical form | Solid / rubbery elastomer | Transparent viscous / semi-solid |
| Key property | High cohesion, tack, gas barrier | Flowability, easy blending, tackifier |
| Typical grades | HB-50 / HB-80 / HB-100 | MB-10 / MB-12 / MB-15 |
| Main applications | Roofing, transdermal, adhesive, film | Sealant, gum base, wax, lubricant |
| Processing | Requires heating / milling | Blends at lower temperature |
Frequently asked questions
Quick answers for buyers and formulators. Need more? Reach our technical team directly.
Request a PIB quote or free sample
Tell us your grade, application and volume - our team replies with COA, TDS and a competitive FOB/CIF quote.