How to number and classify the commodity specifica

2022-08-22
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How to number and classify the product specifications of PVA

the specifications of PVA products are generally numbered and classified by their degree of polymerization and alcoholysis

1. According to the degree of polymerization, it can be divided into:

enterprises that currently require to cooperate with our team to develop new polyurethane materials Research institutes have come in droves with ultra-low degree of polymerization (DP) 200~300

oligomeric degree of polymerization (DP) 300~500

low and medium degree of polymerization (DP) 1200~1500

medium degree of polymerization (DP) 1500~1700

high degree of polymerization (which is also decomposed into nano fibers DP) 1700~2450

ultra high degree of polymerization (DP) 2450~2600

according to the requirements of "two high and one low" sizing process, The polymerization degree of PVA is appropriate between 1000 and 1100

2. According to different alcoholysis degrees, it can be divided into:

complete alcoholysis degree (DH) 95% - 100% (mole fraction)

partial alcoholysis degree (DH) 85% - 90% (mole fraction)

ultra low alcoholysis degree (DH) 70% - 80% (mole fraction)

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