Pyromellitic Anhydride (PMDA) is a raw material for heat resistant polyimide resins, films and coatings.

PMDA is mainly applied as an intermediate for polyimide films as well as polyimide based composite materials in flexible printed circuit boards, tape automated bonding, magnetic wire insulation, and other
high performance applications.

It is also used as a curing agent for epoxy resins used in molding powders (to produce components for seal rings, thrust washers, special gaskets or thermal and electrical insulators), adhesives and coatin

It is mainly used as raw material of polyimide, solidifying agent fo epoxide resin, cross linker of alkyl, vinyl and polyester resin, stabilizer and plasticizing agent of urea formaldehyde resin, also can be used in manufacturing phthalocyanine blue dye, alkyd paint, water-solubility paint and anticorrosive paint, heat rsisting lubricating oil, and etc.

Qingdao Sigma Chemical Co., Ltd.is a global chemical industry manufacturers and suppliers of pharmaceuticals and intermediates, food and feed additives, herbal extracts, agrochemicals and fine chemicals etc.

The aim of Qingdao Sigma Chemical Co., Ltd is a quality policy that "Elements in the system all have been satisfied, Personnel has been trained; Every batch of material is checked, Each procedure guarantees the quality; Every bag of our products is top grade, Service is thoughtful all the time, quality and reputation to increase market share and promote enterprise development. The quality, colors and forms of our products have reached a high level in related chemical industry, which relies on characteristic and advanced processing technology and it has gained a high and reliable reputation from customers at both quality and services.

Q1: Are you a manufacturer?
Answer: Yes, we are factory founded on 2002.
 
Q2: How to contact with us?
Click the Alibaba "Contact Supplier" And then send us message the product you interest in, you will get reply within 24 hours.
 
Q3:Which kind of payment terms do you accept?
For small order,you can pay by T/T,Western Union or Paypal,nomal order by T/T to our company account
 
Q4:Can you give me a discount price?
Surely,It depend on your qty
 
Q5:How can i get a sample?
free samples is available,but freight charges will be at your account and the charges will be return to you or deduct from your order in the future.
 
Q6: How to confirm the Product Quality before placing orders?
A:You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.
 
Q7:How do you treat quality complaint?
A:First of all, our quality control will reduce the quality problem to near zero. If there is a real quality problem caused by us, we will send you free goods for replacement or refund your loss.